1 2/*--------------------------------------------------------------------*/ 3/*--- Support for doing system calls. syscall-mips64-linux.S ---*/ 4/*--------------------------------------------------------------------*/ 5 6/* 7 This file is part of Valgrind, a dynamic binary instrumentation 8 framework. 9 10 Copyright (C) 2010-2017 RT-RK 11 mips-valgrind@rt-rk.com 12 13 This program is free software; you can redistribute it and/or 14 modify it under the terms of the GNU General Public License as 15 published by the Free Software Foundation; either version 2 of the 16 License, or (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, but 19 WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 26 02111-1307, USA. 27 28 The GNU General Public License is contained in the file COPYING. 29*/ 30 31#include "pub_core_basics_asm.h" 32 33#if defined(VGP_mips64_linux) 34 35#include "pub_core_vkiscnums_asm.h" 36#include "libvex_guest_offsets.h" 37 38/*----------------------------------------------------------------*/ 39/* 40 Perform a syscall for the client. This will run a syscall 41 with the client's specific per-thread signal mask. 42 43 The structure of this function is such that, if the syscall is 44 interrupted by a signal, we can determine exactly what 45 execution state we were in with respect to the execution of 46 the syscall by examining the value of PC in the signal 47 handler. This means that we can always do the appropriate 48 thing to precisely emulate the kernel's signal/syscall 49 interactions. 50 51 The syscall number is taken from the argument, even though it 52 should also be in regs->v0. The syscall result is written 53 back to regs->v0 on completion. 54 55 VG_(fixup_guest_state_after_syscall_interrupted) does the 56 thread state fixup in the case where we were interrupted by a 57 signal. 58 59 Prototype: 60 61 UWord ML_(do_syscall_for_client_WRK)( 62 Int syscallno, // $4 - a0 63 void* guest_state, // $5 - a1 64 const vki_sigset_t *sysmask, // $6 - a2 65 const vki_sigset_t *postmask, // $7 - a3 66 Int nsigwords) // $8 - a4 67*/ 68 69/* from vki_arch.h */ 70#define VKI_SIG_SETMASK 3 71 72.globl ML_(do_syscall_for_client_WRK) 73ML_(do_syscall_for_client_WRK): 74 75 /* save regs $a0 - $a4 on stack */ 76 daddiu $29, $29, -48 77 sd $4, 0($29) /* syscallno */ 78 sd $5, 8($29) /* guest_state */ 79 sd $6, 16($29) /* sysmask */ 80 sd $7, 24($29) /* postmask */ 81 sd $8, 32($29) /* nsigwords */ 82 831: li $2, __NR_rt_sigprocmask 84 li $4, VKI_SIG_SETMASK 85 move $5, $6 /* sysmask */ 86 move $6, $7 /* postmask */ 87 move $7, $8 /* nsigwords */ 88 syscall 89 90 bnez $7, 7f 91 nop 92 93 /* Actually do the client syscall */ 94 ld $5, 8($29) /* guest_state */ 95 ld $4, OFFSET_mips64_r4($5) /* a0 */ 96 97 ld $6, OFFSET_mips64_r6($5) /* a2 */ 98 ld $7, OFFSET_mips64_r7($5) /* a3 */ 99 ld $8, OFFSET_mips64_r8($5) /* a4 */ 100 ld $9, OFFSET_mips64_r9($5) /* a5 */ 101 102 ld $5, OFFSET_mips64_r5($5) /* a1 */ 103 ld $2, 0($29) /* syscallno */ 104 1052: syscall 106 107 /* Saving return values into Guest state */ 1083: ld $5, 8($29) /* guest_state */ 109 sd $2, OFFSET_mips64_r2($5) /* v0 */ 110 sd $7, OFFSET_mips64_r7($5) /* a3 */ 111 1124: li $2, __NR_rt_sigprocmask 113 li $4, VKI_SIG_SETMASK 114 ld $5, 24($29) /* postmask */ 115 move $6, $0 /* 0 (zero) */ 116 ld $7, 32($29) /* nsigwords */ 117 syscall 118 119 bnez $7, 7f 120 nop 121 1225: /* restore 29 and return */ 123 daddiu $29, $29, 48 124 jr $31 125 nop 126 1277: /* error */ 128 daddiu $29, $29, 48 129 li $2, 0x8000 130 jr $31 131 nop 132 133.section .rodata 134/* export the ranges so that 135 VG_(fixup_guest_state_after_syscall_interrupted) can do the 136 right thing */ 137 138.globl ML_(blksys_setup) 139.globl ML_(blksys_restart) 140.globl ML_(blksys_complete) 141.globl ML_(blksys_committed) 142.globl ML_(blksys_finished) 143ML_(blksys_setup): .quad 1b 144ML_(blksys_restart): .quad 2b 145ML_(blksys_complete): .quad 3b 146ML_(blksys_committed): .quad 4b 147ML_(blksys_finished): .quad 5b 148 149#endif // defined(VGP_mips64_linux) 150 151/* Let the linker know we don't need an executable stack */ 152MARK_STACK_NO_EXEC 153 154/*--------------------------------------------------------------------*/ 155/*--- end ---*/ 156/*--------------------------------------------------------------------*/ 157