^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
^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) #include <stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <as-layout.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <mm_id.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <os.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <ptrace_user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <registers.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <skas.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <sysdep/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <sysdep/stub.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) extern char batch_syscall_stub[], __syscall_stub_start[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) extern void wait_stub_done(int pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned long *stack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) if (stack == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) stack = (unsigned long *) mm_idp->stack + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *stack = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static unsigned long syscall_regs[MAX_REG_NR];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static int __init init_syscall_regs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) get_safe_registers(syscall_regs, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) syscall_regs[REGS_IP_INDEX] = STUB_CODE +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) ((unsigned long) batch_syscall_stub -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) (unsigned long) __syscall_stub_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) __initcall(init_syscall_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) int n, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) long ret, offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned long * data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) unsigned long * syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int err, pid = mm_idp->u.pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) n = ptrace_setregs(pid, syscall_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (n < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) printk(UM_KERN_ERR "Registers - \n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) for (i = 0; i < MAX_REG_NR; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) printk(UM_KERN_ERR "\t%d\t0x%lx\n", i, syscall_regs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) -n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) err = ptrace(PTRACE_CONT, pid, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) panic("Failed to continue stub, pid = %d, errno = %d\n", pid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) wait_stub_done(pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * When the stub stops, we find the following values on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * beginning of the stack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * (long )return_value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * (long )offset to failed sycall-data (0, if no error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) ret = *((unsigned long *) mm_idp->stack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) offset = *((unsigned long *) mm_idp->stack + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) data = (unsigned long *)(mm_idp->stack + offset - STUB_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) printk(UM_KERN_ERR "do_syscall_stub : ret = %ld, offset = %ld, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) "data = %p\n", ret, offset, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) syscall = (unsigned long *)((unsigned long)data + data[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) printk(UM_KERN_ERR "do_syscall_stub: syscall %ld failed, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) "return value = 0x%lx, expected return value = 0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) syscall[0], ret, syscall[7]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) printk(UM_KERN_ERR " syscall parameters: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) syscall[1], syscall[2], syscall[3],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) syscall[4], syscall[5], syscall[6]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) for (n = 1; n < data[0]/sizeof(long); n++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (n == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) printk(UM_KERN_ERR " additional syscall "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) "data:");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (n % 4 == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) printk("\n" UM_KERN_ERR " ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) printk(" 0x%lx", data[n]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (n > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) printk("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) else ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) *addr = check_init_stack(mm_idp, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) long run_syscall_stub(struct mm_id * mm_idp, int syscall,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) unsigned long *args, long expected, void **addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) unsigned long *stack = check_init_stack(mm_idp, *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) *stack += sizeof(long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) stack += *stack / sizeof(long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) *stack++ = syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) *stack++ = args[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) *stack++ = args[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) *stack++ = args[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) *stack++ = args[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) *stack++ = args[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) *stack++ = args[5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) *stack++ = expected;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) *stack = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!done && ((((unsigned long) stack) & ~UM_KERN_PAGE_MASK) <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) UM_KERN_PAGE_SIZE - 10 * sizeof(long))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) *addr = stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return do_syscall_stub(mm_idp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) long syscall_stub_data(struct mm_id * mm_idp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) unsigned long *data, int data_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) void **addr, void **stub_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) unsigned long *stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * If *addr still is uninitialized, it *must* contain NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * Thus in this case do_syscall_stub correctly won't be called.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if ((((unsigned long) *addr) & ~UM_KERN_PAGE_MASK) >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) ret = do_syscall_stub(mm_idp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /* in case of error, don't overwrite data on stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) stack = check_init_stack(mm_idp, *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) *addr = stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) *stack = data_count * sizeof(long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) memcpy(stack + 1, data, data_count * sizeof(long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) *stub_addr = (void *)(((unsigned long)(stack + 1) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) ~UM_KERN_PAGE_MASK) + STUB_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) int phys_fd, unsigned long long offset, int done, void **data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) unsigned long args[] = { virt, len, prot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) MAP_SHARED | MAP_FIXED, phys_fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) MMAP_OFFSET(offset) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) data, done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int done, void **data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) data, done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) unsigned int prot, int done, void **data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) unsigned long args[] = { addr, len, prot, 0, 0, 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) data, done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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