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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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154 lines
4.7 KiB
ArmAsm
154 lines
4.7 KiB
ArmAsm
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/*--------------------------------------------------------------------*/
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/*--- Support for doing system calls. syscall-arm-linux.S ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2008-2013 Evan Geller (gaze@bea.ms)
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#if defined(VGP_arm_linux)
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#include "pub_core_basics_asm.h"
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#include "pub_core_vkiscnums_asm.h"
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#include "libvex_guest_offsets.h"
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/*----------------------------------------------------------------*/
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/*
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Perform a syscall for the client. This will run a syscall
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with the client's specific per-thread signal mask.
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The structure of this function is such that, if the syscall is
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interrupted by a signal, we can determine exactly what
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execution state we were in with respect to the execution of
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the syscall by examining the value of IP in the signal
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handler. This means that we can always do the appropriate
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thing to precisely emulate the kernel's signal/syscall
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interactions.
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The syscall number is taken from the argument, even though it
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should also be in regs->m_R7. The syscall result is written
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back to regs->m_R0 on completion.
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Returns 0 if the syscall was successfully called (even if the
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syscall itself failed), or a nonzero error code in the lowest
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8 bits if one of the sigprocmasks failed (there's no way to
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determine which one failed). And there's no obvious way to
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recover from that either, but nevertheless we want to know.
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VG_(fixup_guest_state_after_syscall_interrupted) does the
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thread state fixup in the case where we were interrupted by a
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signal.
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Prototype:
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UWord ML_(do_syscall_for_client_WRK)(
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Int syscallno, // r0
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void* guest_state, // r1
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const vki_sigset_t *sysmask, // r2
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const vki_sigset_t *postmask, // r3
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Int nsigwords) // [sp, #0]
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*/
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/* from vki_arch.h */
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#define VKI_SIG_SETMASK 2
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.globl ML_(do_syscall_for_client_WRK)
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ML_(do_syscall_for_client_WRK):
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/* Stash callee-saves and our args on the stack */
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push {r0, r1, r3, r4, r5, r7, fp, lr}
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1:
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mov r7, #__NR_rt_sigprocmask
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mov r0, #VKI_SIG_SETMASK
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mov r1, r2 /* sysmask */
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mov r2, r3 /* postmask */
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ldr r3, [sp, #32] /* nsigwords */
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svc 0x00000000
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ldr r5, [sp, #4] /* guest_state */
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ldr r7, [sp, #0] /* syscall# */
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ldr r0, [r5, #OFFSET_arm_R0]
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ldr r1, [r5, #OFFSET_arm_R1]
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ldr r2, [r5, #OFFSET_arm_R2]
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ldr r3, [r5, #OFFSET_arm_R3]
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ldr r4, [r5, #OFFSET_arm_R4]
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ldr r5, [r5, #OFFSET_arm_R5]
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2: svc 0x00000000
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3:
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ldr r5, [sp, #4] /* guest_state */
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str r0, [r5, #OFFSET_arm_R0]
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4:
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mov r7, #__NR_rt_sigprocmask
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mov r0, #VKI_SIG_SETMASK
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ldr r1, [sp, #8] /* postmask */
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mov r2, #0
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ldr r3, [sp, #32] /* nsigwords */
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svc 0x00000000
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cmp r0, #0
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blt 7f
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add sp, sp, #4 /* r0 contains return value */
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5: /* Success */
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mov r0, #0
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pop {r1, r3, r4, r5, r7, fp, pc}
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7: /* Failure: return 0x8000 | error code */
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orr r0, r0, #0x8000
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pop {r1, r3, r4, r5, r7, fp, pc}
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.section .rodata
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/* export the ranges so that
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VG_(fixup_guest_state_after_syscall_interrupted) can do the
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right thing */
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.globl ML_(blksys_setup)
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.globl ML_(blksys_restart)
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.globl ML_(blksys_complete)
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.globl ML_(blksys_committed)
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.globl ML_(blksys_finished)
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ML_(blksys_setup): .long 1b
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ML_(blksys_restart): .long 2b
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ML_(blksys_complete): .long 3b
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ML_(blksys_committed): .long 4b
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ML_(blksys_finished): .long 5b
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/* Let the linker know we don't need an executable stack */
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.section .note.GNU-stack,"",%progbits
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.previous
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#endif // defined(VGP_arm_linux)
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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