^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Kernel module help for PPC64.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/moduleloader.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/firmware.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/code-patching.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/sort.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/inst.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* FIXME: We don't do .init separately. To do this, we'd need to have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) a separate r2 value in the init and core section, and stub between
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) them, too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) Using a magic allocator which places modules within 32MB solves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) this, and makes other things simpler. Anton?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) --RR. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #ifdef PPC64_ELF_ABI_v2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* An address is simply the address of the function. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) typedef unsigned long func_desc_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static func_desc_t func_desc(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static unsigned long func_addr(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static unsigned long stub_func_addr(func_desc_t func)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return func;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* PowerPC64 specific values for the Elf64_Sym st_other field. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define STO_PPC64_LOCAL_BIT 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #define STO_PPC64_LOCAL_MASK (7 << STO_PPC64_LOCAL_BIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #define PPC64_LOCAL_ENTRY_OFFSET(other) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) (((1 << (((other) & STO_PPC64_LOCAL_MASK) >> STO_PPC64_LOCAL_BIT)) >> 2) << 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static unsigned int local_entry_offset(const Elf64_Sym *sym)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* sym->st_other indicates offset to local entry point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * (otherwise it will assume r12 is the address of the start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * of function and try to derive r2 from it). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return PPC64_LOCAL_ENTRY_OFFSET(sym->st_other);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /* An address is address of the OPD entry, which contains address of fn. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) typedef struct ppc64_opd_entry func_desc_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static func_desc_t func_desc(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return *(struct ppc64_opd_entry *)addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static unsigned long func_addr(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return func_desc(addr).funcaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static unsigned long stub_func_addr(func_desc_t func)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return func.funcaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static unsigned int local_entry_offset(const Elf64_Sym *sym)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) void *dereference_module_function_descriptor(struct module *mod, void *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (ptr < (void *)mod->arch.start_opd ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) ptr >= (void *)mod->arch.end_opd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return dereference_function_descriptor(ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #define STUB_MAGIC 0x73747562 /* stub */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* Like PPC32, we need little trampolines to do > 24-bit jumps (into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) the kernel itself). But on PPC64, these need to be used for every
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) jump, actually, to reset r2 (TOC+0x8000). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct ppc64_stub_entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /* 28 byte jump instruction sequence (7 instructions). We only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * need 6 instructions on ABIv2 but we always allocate 7 so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * so we don't have to modify the trampoline load instruction. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) u32 jump[7];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* Used by ftrace to identify stubs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) u32 magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /* Data for the above code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) func_desc_t funcdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * PPC64 uses 24 bit jumps, but we need to jump into other modules or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * the kernel which may be further. So we jump to a stub.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * For ELFv1 we need to use this to set up the new r2 value (aka TOC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * pointer). For ELFv2 it's the callee's responsibility to set up the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * new r2, but for both we need to save the old r2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * We could simply patch the new r2 value and function pointer into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * the stub, but it's significantly shorter to put these values at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * end of the stub code, and patch the stub address (32-bits relative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * to the TOC ptr, r2) into the stub.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * addis r11,r2, <high>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * addi r11,r11, <low>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * std r2,R2_STACK_OFFSET(r1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * ld r12,32(r11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * ld r2,40(r11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * mtctr r12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * bctr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static u32 ppc64_stub_insns[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) PPC_INST_ADDIS | __PPC_RT(R11) | __PPC_RA(R2),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) PPC_INST_ADDI | __PPC_RT(R11) | __PPC_RA(R11),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* Save current r2 value in magic place on the stack. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) PPC_INST_STD | __PPC_RS(R2) | __PPC_RA(R1) | R2_STACK_OFFSET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) PPC_INST_LD | __PPC_RT(R12) | __PPC_RA(R11) | 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) #ifdef PPC64_ELF_ABI_v1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* Set up new r2 from function descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) PPC_INST_LD | __PPC_RT(R2) | __PPC_RA(R11) | 40,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) PPC_INST_MTCTR | __PPC_RS(R12),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) PPC_INST_BCTR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* Count how many different 24-bit relocations (different symbol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) different addend) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) unsigned int i, r_info, r_addend, _count_relocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /* FIXME: Only count external ones --RR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) _count_relocs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) r_info = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) r_addend = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) for (i = 0; i < num; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* Only count 24-bit relocs, others don't need stubs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (ELF64_R_TYPE(rela[i].r_info) == R_PPC_REL24 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) (r_info != ELF64_R_SYM(rela[i].r_info) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) r_addend != rela[i].r_addend)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) _count_relocs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) r_info = ELF64_R_SYM(rela[i].r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) r_addend = rela[i].r_addend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return _count_relocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static int relacmp(const void *_x, const void *_y)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) const Elf64_Rela *x, *y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) y = (Elf64_Rela *)_x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) x = (Elf64_Rela *)_y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /* Compare the entire r_info (as opposed to ELF64_R_SYM(r_info) only) to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * make the comparison cheaper/faster. It won't affect the sorting or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * the counting algorithms' performance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (x->r_info < y->r_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) else if (x->r_info > y->r_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) else if (x->r_addend < y->r_addend)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) else if (x->r_addend > y->r_addend)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* Get size of potential trampolines required. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static unsigned long get_stubs_size(const Elf64_Ehdr *hdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) const Elf64_Shdr *sechdrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /* One extra reloc so it's always 0-funcaddr terminated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) unsigned long relocs = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /* Every relocated section... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) for (i = 1; i < hdr->e_shnum; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (sechdrs[i].sh_type == SHT_RELA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) pr_debug("Found relocations in section %u\n", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) pr_debug("Ptr: %p. Number: %Lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) (void *)sechdrs[i].sh_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) sechdrs[i].sh_size / sizeof(Elf64_Rela));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /* Sort the relocation information based on a symbol and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * addend key. This is a stable O(n*log n) complexity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * alogrithm but it will reduce the complexity of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * count_relocs() to linear complexity O(n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) sort((void *)sechdrs[i].sh_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) sechdrs[i].sh_size / sizeof(Elf64_Rela),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) sizeof(Elf64_Rela), relacmp, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) relocs += count_relocs((void *)sechdrs[i].sh_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) sechdrs[i].sh_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) / sizeof(Elf64_Rela));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /* make the trampoline to the ftrace_caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) relocs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /* an additional one for ftrace_regs_caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) relocs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) pr_debug("Looks like a total of %lu stubs, max\n", relocs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) return relocs * sizeof(struct ppc64_stub_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /* Still needed for ELFv2, for .TOC. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static void dedotify_versions(struct modversion_info *vers,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) struct modversion_info *end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) for (end = (void *)vers + size; vers < end; vers++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (vers->name[0] == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) memmove(vers->name, vers->name+1, strlen(vers->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * Undefined symbols which refer to .funcname, hack to funcname. Make .TOC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * seem to be defined (value set later).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static void dedotify(Elf64_Sym *syms, unsigned int numsyms, char *strtab)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) for (i = 1; i < numsyms; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (syms[i].st_shndx == SHN_UNDEF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) char *name = strtab + syms[i].st_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (name[0] == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (strcmp(name+1, "TOC.") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) syms[i].st_shndx = SHN_ABS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) syms[i].st_name++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static Elf64_Sym *find_dot_toc(Elf64_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) const char *strtab,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) unsigned int symindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) unsigned int i, numsyms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) Elf64_Sym *syms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) syms = (Elf64_Sym *)sechdrs[symindex].sh_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) numsyms = sechdrs[symindex].sh_size / sizeof(Elf64_Sym);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) for (i = 1; i < numsyms; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (syms[i].st_shndx == SHN_ABS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) && strcmp(strtab + syms[i].st_name, "TOC.") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return &syms[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) int module_frob_arch_sections(Elf64_Ehdr *hdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) Elf64_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) char *secstrings,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) struct module *me)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /* Find .toc and .stubs sections, symtab and strtab */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) for (i = 1; i < hdr->e_shnum; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (strcmp(secstrings + sechdrs[i].sh_name, ".stubs") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) me->arch.stubs_section = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) else if (strcmp(secstrings + sechdrs[i].sh_name, ".toc") == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) me->arch.toc_section = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) if (sechdrs[i].sh_addralign < 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) sechdrs[i].sh_addralign = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) dedotify_versions((void *)hdr + sechdrs[i].sh_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) sechdrs[i].sh_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /* We don't handle .init for the moment: rename to _init */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) while ((p = strstr(secstrings + sechdrs[i].sh_name, ".init")))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) p[0] = '_';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (sechdrs[i].sh_type == SHT_SYMTAB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) dedotify((void *)hdr + sechdrs[i].sh_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) sechdrs[i].sh_size / sizeof(Elf64_Sym),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) (void *)hdr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) + sechdrs[sechdrs[i].sh_link].sh_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (!me->arch.stubs_section) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) pr_err("%s: doesn't contain .stubs.\n", me->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /* If we don't have a .toc, just use .stubs. We need to set r2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) to some reasonable value in case the module calls out to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) other functions via a stub, or if a function pointer escapes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) the module by some means. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (!me->arch.toc_section)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) me->arch.toc_section = me->arch.stubs_section;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) /* Override the stubs size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) sechdrs[me->arch.stubs_section].sh_size = get_stubs_size(hdr, sechdrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) #ifdef CONFIG_MPROFILE_KERNEL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) #define PACATOC offsetof(struct paca_struct, kernel_toc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * ld r12,PACATOC(r13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * addis r12,r12,<high>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * addi r12,r12,<low>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * mtctr r12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * bctr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static u32 stub_insns[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) PPC_INST_LD | __PPC_RT(R12) | __PPC_RA(R13) | PACATOC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) PPC_INST_ADDIS | __PPC_RT(R12) | __PPC_RA(R12),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) PPC_INST_ADDI | __PPC_RT(R12) | __PPC_RA(R12),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) PPC_INST_MTCTR | __PPC_RS(R12),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) PPC_INST_BCTR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * For mprofile-kernel we use a special stub for ftrace_caller() because we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * can't rely on r2 containing this module's TOC when we enter the stub.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) * That can happen if the function calling us didn't need to use the toc. In
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) * that case it won't have setup r2, and the r2 value will be either the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * kernel's toc, or possibly another modules toc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) * To deal with that this stub uses the kernel toc, which is always accessible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) * via the paca (in r13). The target (ftrace_caller()) is responsible for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * saving and restoring the toc before returning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) static inline int create_ftrace_stub(struct ppc64_stub_entry *entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) struct module *me)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) long reladdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) memcpy(entry->jump, stub_insns, sizeof(stub_insns));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) /* Stub uses address relative to kernel toc (from the paca) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) reladdr = addr - kernel_toc_addr();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) pr_err("%s: Address of %ps out of range of kernel_toc.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) me->name, (void *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) entry->jump[1] |= PPC_HA(reladdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) entry->jump[2] |= PPC_LO(reladdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /* Eventhough we don't use funcdata in the stub, it's needed elsewhere. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) entry->funcdata = func_desc(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) entry->magic = STUB_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) static bool is_mprofile_ftrace_call(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (!strcmp("_mcount", name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (!strcmp("ftrace_caller", name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (!strcmp("ftrace_regs_caller", name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) static inline int create_ftrace_stub(struct ppc64_stub_entry *entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct module *me)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) static bool is_mprofile_ftrace_call(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * r2 is the TOC pointer: it actually points 0x8000 into the TOC (this gives the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * value maximum span in an instruction which uses a signed offset). Round down
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) * to a 256 byte boundary for the odd case where we are setting up r2 without a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * .toc section.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) static inline unsigned long my_r2(const Elf64_Shdr *sechdrs, struct module *me)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return (sechdrs[me->arch.toc_section].sh_addr & ~0xfful) + 0x8000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) /* Patch stub to reference function and correct r2 value. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) static inline int create_stub(const Elf64_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) struct ppc64_stub_entry *entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) struct module *me,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) long reladdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (is_mprofile_ftrace_call(name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) return create_ftrace_stub(entry, addr, me);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) memcpy(entry->jump, ppc64_stub_insns, sizeof(ppc64_stub_insns));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /* Stub uses address relative to r2. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) reladdr = (unsigned long)entry - my_r2(sechdrs, me);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) pr_err("%s: Address %p of stub out of range of %p.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) me->name, (void *)reladdr, (void *)my_r2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) pr_debug("Stub %p get data from reladdr %li\n", entry, reladdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) entry->jump[0] |= PPC_HA(reladdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) entry->jump[1] |= PPC_LO(reladdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) entry->funcdata = func_desc(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) entry->magic = STUB_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) /* Create stub to jump to function described in this OPD/ptr: we need the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) stub to set up the TOC ptr (r2) for the function. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) static unsigned long stub_for_addr(const Elf64_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) struct module *me,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) struct ppc64_stub_entry *stubs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) unsigned int i, num_stubs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) num_stubs = sechdrs[me->arch.stubs_section].sh_size / sizeof(*stubs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* Find this stub, or if that fails, the next avail. entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) stubs = (void *)sechdrs[me->arch.stubs_section].sh_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) for (i = 0; stub_func_addr(stubs[i].funcdata); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if (WARN_ON(i >= num_stubs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (stub_func_addr(stubs[i].funcdata) == func_addr(addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) return (unsigned long)&stubs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (!create_stub(sechdrs, &stubs[i], addr, me, name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) return (unsigned long)&stubs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) /* We expect a noop next: if it is, replace it with instruction to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) restore r2. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) static int restore_r2(const char *name, u32 *instruction, struct module *me)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) u32 *prev_insn = instruction - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) if (is_mprofile_ftrace_call(name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) * Make sure the branch isn't a sibling call. Sibling calls aren't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * "link" branches and they don't return, so they don't need the r2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) * restore afterwards.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (!instr_is_relative_link_branch(ppc_inst(*prev_insn)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (*instruction != PPC_INST_NOP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) pr_err("%s: Expected nop after call, got %08x at %pS\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) me->name, *instruction, instruction);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) /* ld r2,R2_STACK_OFFSET(r1) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) *instruction = PPC_INST_LD_TOC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) int apply_relocate_add(Elf64_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) const char *strtab,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) unsigned int symindex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) unsigned int relsec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) struct module *me)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) Elf64_Rela *rela = (void *)sechdrs[relsec].sh_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) Elf64_Sym *sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) unsigned long *location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) unsigned long value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) pr_debug("Applying ADD relocate section %u to %u\n", relsec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) sechdrs[relsec].sh_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) /* First time we're called, we can fix up .TOC. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if (!me->arch.toc_fixed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) sym = find_dot_toc(sechdrs, strtab, symindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) /* It's theoretically possible that a module doesn't want a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * .TOC. so don't fail it just for that. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (sym)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) sym->st_value = my_r2(sechdrs, me);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) me->arch.toc_fixed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) /* This is where to make the change */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) + rela[i].r_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) /* This is the symbol it is referring to */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) + ELF64_R_SYM(rela[i].r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) pr_debug("RELOC at %p: %li-type as %s (0x%lx) + %li\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) location, (long)ELF64_R_TYPE(rela[i].r_info),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) strtab + sym->st_name, (unsigned long)sym->st_value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) (long)rela[i].r_addend);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) /* `Everything is relative'. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) value = sym->st_value + rela[i].r_addend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) switch (ELF64_R_TYPE(rela[i].r_info)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) case R_PPC64_ADDR32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) /* Simply set it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) *(u32 *)location = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) case R_PPC64_ADDR64:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) /* Simply set it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) *(unsigned long *)location = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) case R_PPC64_TOC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) *(unsigned long *)location = my_r2(sechdrs, me);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) case R_PPC64_TOC16:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) /* Subtract TOC pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) value -= my_r2(sechdrs, me);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) if (value + 0x8000 > 0xffff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) pr_err("%s: bad TOC16 relocation (0x%lx)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) me->name, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) *((uint16_t *) location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) = (*((uint16_t *) location) & ~0xffff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) | (value & 0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) case R_PPC64_TOC16_LO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) /* Subtract TOC pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) value -= my_r2(sechdrs, me);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) *((uint16_t *) location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) = (*((uint16_t *) location) & ~0xffff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) | (value & 0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) case R_PPC64_TOC16_DS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) /* Subtract TOC pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) value -= my_r2(sechdrs, me);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) if ((value & 3) != 0 || value + 0x8000 > 0xffff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) pr_err("%s: bad TOC16_DS relocation (0x%lx)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) me->name, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) *((uint16_t *) location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) = (*((uint16_t *) location) & ~0xfffc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) | (value & 0xfffc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) case R_PPC64_TOC16_LO_DS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) /* Subtract TOC pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) value -= my_r2(sechdrs, me);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) if ((value & 3) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) pr_err("%s: bad TOC16_LO_DS relocation (0x%lx)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) me->name, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) *((uint16_t *) location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) = (*((uint16_t *) location) & ~0xfffc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) | (value & 0xfffc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) case R_PPC64_TOC16_HA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) /* Subtract TOC pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) value -= my_r2(sechdrs, me);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) value = ((value + 0x8000) >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) *((uint16_t *) location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) = (*((uint16_t *) location) & ~0xffff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) | (value & 0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) case R_PPC_REL24:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) /* FIXME: Handle weak symbols here --RR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) if (sym->st_shndx == SHN_UNDEF ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) sym->st_shndx == SHN_LIVEPATCH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) /* External: go via stub */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) value = stub_for_addr(sechdrs, value, me,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) strtab + sym->st_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) if (!value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (!restore_r2(strtab + sym->st_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) (u32 *)location + 1, me))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) value += local_entry_offset(sym);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) /* Convert value to relative */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) value -= (unsigned long)location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) if (value + 0x2000000 > 0x3ffffff || (value & 3) != 0){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) pr_err("%s: REL24 %li out of range!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) me->name, (long int)value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) /* Only replace bits 2 through 26 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) *(uint32_t *)location
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) = (*(uint32_t *)location & ~0x03fffffc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) | (value & 0x03fffffc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) case R_PPC64_REL64:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) /* 64 bits relative (used by features fixups) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) *location = value - (unsigned long)location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) case R_PPC64_REL32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) /* 32 bits relative (used by relative exception tables) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) /* Convert value to relative */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) value -= (unsigned long)location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) if (value + 0x80000000 > 0xffffffff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) pr_err("%s: REL32 %li out of range!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) me->name, (long int)value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) *(u32 *)location = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) case R_PPC64_TOCSAVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) * Marker reloc indicates we don't have to save r2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) * That would only save us one instruction, so ignore
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) * it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) case R_PPC64_ENTRY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) * Optimize ELFv2 large code model entry point if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) * the TOC is within 2GB range of current location.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) value = my_r2(sechdrs, me) - (unsigned long)location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) if (value + 0x80008000 > 0xffffffff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) * Check for the large code model prolog sequence:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) * ld r2, ...(r12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) * add r2, r2, r12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) if ((((uint32_t *)location)[0] & ~0xfffc) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) (PPC_INST_LD | __PPC_RT(R2) | __PPC_RA(R12)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) if (((uint32_t *)location)[1] !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) (PPC_INST_ADD | __PPC_RT(R2) | __PPC_RA(R2) | __PPC_RB(R12)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) * If found, replace it with:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) * addis r2, r12, (.TOC.-func)@ha
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) * addi r2, r2, (.TOC.-func)@l
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) ((uint32_t *)location)[0] = PPC_INST_ADDIS | __PPC_RT(R2) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) __PPC_RA(R12) | PPC_HA(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) ((uint32_t *)location)[1] = PPC_INST_ADDI | __PPC_RT(R2) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) __PPC_RA(R2) | PPC_LO(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) case R_PPC64_REL16_HA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) /* Subtract location pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) value -= (unsigned long)location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) value = ((value + 0x8000) >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) *((uint16_t *) location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) = (*((uint16_t *) location) & ~0xffff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) | (value & 0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) case R_PPC64_REL16_LO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) /* Subtract location pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) value -= (unsigned long)location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) *((uint16_t *) location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) = (*((uint16_t *) location) & ~0xffff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) | (value & 0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) pr_err("%s: Unknown ADD relocation: %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) me->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) (unsigned long)ELF64_R_TYPE(rela[i].r_info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) int module_trampoline_target(struct module *mod, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) unsigned long *target)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) struct ppc64_stub_entry *stub;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) func_desc_t funcdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) u32 magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) if (!within_module_core(addr, mod)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) pr_err("%s: stub %lx not in module %s\n", __func__, addr, mod->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) stub = (struct ppc64_stub_entry *)addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) if (copy_from_kernel_nofault(&magic, &stub->magic,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) sizeof(magic))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) pr_err("%s: fault reading magic for stub %lx for %s\n", __func__, addr, mod->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) if (magic != STUB_MAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) pr_err("%s: bad magic for stub %lx for %s\n", __func__, addr, mod->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) if (copy_from_kernel_nofault(&funcdata, &stub->funcdata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) sizeof(funcdata))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) pr_err("%s: fault reading funcdata for stub %lx for %s\n", __func__, addr, mod->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) *target = stub_func_addr(funcdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) mod->arch.tramp = stub_for_addr(sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) (unsigned long)ftrace_caller,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) mod,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) "ftrace_caller");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) mod->arch.tramp_regs = stub_for_addr(sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) (unsigned long)ftrace_regs_caller,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) mod,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) "ftrace_regs_caller");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) if (!mod->arch.tramp_regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) if (!mod->arch.tramp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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