^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 1995 - 2000, 2001 by Ralf Baechle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2001 MIPS Technologies, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2004 Thiemo Seufer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Hairy, the userspace application uses a different argument passing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * convention than the kernel, so we have to translate things from o32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * to ABI64 calling convention. 64-bit syscalls are also processed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * here for now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/asm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/asmmacro.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/irqflags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/mipsregs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/regdef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/stackframe.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/thread_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/sysmips.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) .align 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) NESTED(handle_sys, PT_SIZE, sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) .set noat
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) SAVE_SOME
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) TRACE_IRQS_ON_RELOAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) STI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) .set at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) ld t1, PT_EPC(sp) # skip syscall on return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) dsubu t0, v0, __NR_O32_Linux # check syscall number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) sltiu t0, t0, __NR_O32_Linux_syscalls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) daddiu t1, 4 # skip to next instruction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) sd t1, PT_EPC(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) beqz t0, not_o32_scall
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #if 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) SAVE_ALL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) move a1, v0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) ASM_PRINT("Scall %ld\n")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) RESTORE_ALL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /* We don't want to stumble over broken sign extensions from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) userland. O32 does never use the upper half. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) sll a0, a0, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) sll a1, a1, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) sll a2, a2, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) sll a3, a3, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) sd a3, PT_R26(sp) # save a3 for syscall restarting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * More than four arguments. Try to deal with it by copying the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * stack arguments from the user stack to the kernel stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * This Sucks (TM).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * We intentionally keep the kernel stack a little below the top of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * userspace so we don't have to do a slower byte accurate check here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) ld t0, PT_R29(sp) # get old user stack pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) daddu t1, t0, 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) bltz t1, bad_stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) load_a4: lw a4, 16(t0) # argument #5 from usp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) load_a5: lw a5, 20(t0) # argument #6 from usp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) load_a6: lw a6, 24(t0) # argument #7 from usp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) load_a7: lw a7, 28(t0) # argument #8 from usp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) loads_done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .section __ex_table,"a"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) PTR load_a4, bad_stack_a4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) PTR load_a5, bad_stack_a5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) PTR load_a6, bad_stack_a6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) PTR load_a7, bad_stack_a7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .previous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) li t1, _TIF_WORK_SYSCALL_ENTRY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) and t0, t1, t0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) bnez t0, trace_a_syscall
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) syscall_common:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) dsll t0, v0, 3 # offset into table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) ld t2, (sys32_call_table - (__NR_O32_Linux * 8))(t0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) jalr t2 # Do The Real Thing (TM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) li t0, -EMAXERRNO - 1 # error?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) sltu t0, t0, v0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) sd t0, PT_R7(sp) # set error flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) beqz t0, 1f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ld t1, PT_R2(sp) # syscall number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) dnegu v0 # error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) sd t1, PT_R0(sp) # save it for syscall restarting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 1: sd v0, PT_R2(sp) # result
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) o32_syscall_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) j syscall_exit_partial
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* ------------------------------------------------------------------------ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) trace_a_syscall:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) SAVE_STATIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) sd a4, PT_R8(sp) # Save argument registers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) sd a5, PT_R9(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) sd a6, PT_R10(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) sd a7, PT_R11(sp) # For indirect syscalls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) move a0, sp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * absolute syscall number is in v0 unless we called syscall(__NR_###)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * where the real syscall number is in a0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * note: NR_syscall is the first O32 syscall but the macro is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * only defined when compiling with -mabi=32 (CONFIG_32BIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * therefore __NR_O32_Linux is used (4000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) .set push
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) .set reorder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) subu t1, v0, __NR_O32_Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) move a1, v0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) bnez t1, 1f /* __NR_syscall at offset 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) ld a1, PT_R4(sp) /* Arg1 for __NR_syscall case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) .set pop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 1: jal syscall_trace_enter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) bltz v0, 1f # seccomp failed? Skip syscall
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) RESTORE_STATIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ld v0, PT_R2(sp) # Restore syscall (maybe modified)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) ld a0, PT_R4(sp) # Restore argument registers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) ld a1, PT_R5(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ld a2, PT_R6(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) ld a3, PT_R7(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ld a4, PT_R8(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) ld a5, PT_R9(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) ld a6, PT_R10(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) ld a7, PT_R11(sp) # For indirect syscalls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) dsubu t0, v0, __NR_O32_Linux # check (new) syscall number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) sltiu t0, t0, __NR_O32_Linux_syscalls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) beqz t0, not_o32_scall
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) j syscall_common
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 1: j syscall_exit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /* ------------------------------------------------------------------------ */
^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) * The stackpointer for a call with more than 4 arguments is bad.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) bad_stack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) li v0, EFAULT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) sd v0, PT_R2(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) li t0, 1 # set error flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) sd t0, PT_R7(sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) j o32_syscall_exit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) bad_stack_a4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) li a4, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) b load_a5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) bad_stack_a5:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) li a5, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) b load_a6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) bad_stack_a6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) li a6, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) b load_a7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) bad_stack_a7:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) li a7, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) b loads_done
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) not_o32_scall:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * This is not an o32 compatibility syscall, pass it on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * to the 64-bit syscall handlers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) #ifdef CONFIG_MIPS32_N32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) j handle_sysn32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) j handle_sys64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) END(handle_sys)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) LEAF(sys32_syscall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) subu t0, a0, __NR_O32_Linux # check syscall number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) sltiu v0, t0, __NR_O32_Linux_syscalls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) beqz t0, einval # do not recurse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) dsll t1, t0, 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) beqz v0, einval
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) ld t2, sys32_call_table(t1) # syscall routine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) move a0, a1 # shift argument registers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) move a1, a2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) move a2, a3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) move a3, a4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) move a4, a5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) move a5, a6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) move a6, a7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) jr t2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /* Unreached */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) einval: li v0, -ENOSYS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) jr ra
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) END(sys32_syscall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) #define __SYSCALL(nr, entry) PTR entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) .align 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) .type sys32_call_table,@object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) EXPORT(sys32_call_table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) #include <asm/syscall_table_64_o32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) #undef __SYSCALL