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d971e9300f
mips-valgrind@rt-rk.com, Bug 270777. Valgrind: new non-test files for mips32-linux. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12617
216 lines
5.9 KiB
ArmAsm
216 lines
5.9 KiB
ArmAsm
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/*--------------------------------------------------------------------*/
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/*--- Support for doing system calls. syscall-mips32-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) 2010-2012 RT-RK
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mips-valgrind@rt-rk.com
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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_mips32_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->v0. The syscall result is written
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back to regs->v0 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, // $4 - a0
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void* guest_state, // $5 - a1
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const vki_sigset_t *sysmask, // $6 - a2
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const vki_sigset_t *postmask, // $7 - a3
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Int nsigwords) // stack
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*/
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/* from vki_arch.h */
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#define VKI_SIG_SETMASK 3
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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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subu $29, $29, 56 #set up the steck frame,
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sw $4, 52($29)
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sw $5, 48($29)
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sw $6, 44($29)
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sw $7, 40($29)
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sw $31, 36($29)
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sw $30, 32($29)
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sw $16, 28($29)
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sw $17, 24($29)
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sw $18, 20($29)
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sw $19, 16($29)
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sw $20, 12($29)
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sw $21, 8($29)
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sw $22, 4($29)
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sw $23, 0($29)
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addu $30, $29, 56
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/* Set the signal mask which should be current during the syscall. */
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1: li $2, __NR_rt_sigprocmask
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li $4, VKI_SIG_SETMASK
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move $5, $6 /* sysmask */
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move $6, $7 /* postmask */
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lw $7, 72($29) /* nsigwords */
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syscall
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nop
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# TODO: this should remain, keep it just for now
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bnez $7, 7f
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nop
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lw $8, 48($29) /* t0 == ThreadState */
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lw $2, 52($29) /* v0 == syscallno */
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lw $4, OFFSET_mips32_r4($8)
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lw $5, OFFSET_mips32_r5($8)
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lw $6, OFFSET_mips32_r6($8)
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lw $7, OFFSET_mips32_r7($8)
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subu $29, $29, 24 #set up the steck frame,
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lw $9, OFFSET_mips32_r29($8)
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lw $10, 16($9)
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sw $10, 16($29)
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lw $10, 20($9)
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sw $10, 20($29)
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2: syscall
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3: addu $29, $29, 24 #set up the steck frame,
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lw $8, 48($29) /* t0 == ThreadState */
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sw $2, OFFSET_mips32_r2($8)
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sw $3, OFFSET_mips32_r3($8)
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sw $7, OFFSET_mips32_r7($8)
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4: li $2, __NR_rt_sigprocmask
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li $4, VKI_SIG_SETMASK
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lw $5, 40($29)
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li $6, 0
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lw $7, 72($29) /* nsigwords */
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syscall
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nop
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bnez $7, 7f
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nop
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/* Success */
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li $2, 0
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5: lw $4, 52($29)
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lw $5, 48($29)
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lw $6, 44($29)
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lw $7, 40($29)
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lw $31, 36($29)
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lw $30, 32($29)
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lw $16, 28($29)
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lw $17, 24($29)
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lw $18, 20($29)
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lw $19, 16($29)
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lw $20, 12($29)
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lw $21, 8($29)
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lw $22, 4($29)
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lw $23, 0($29)
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addu $29, $29, 56 #release the stack frame.
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jr $31
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nop
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7: /* Failure: return 0x8000 | error code */
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li $2, 0x8000
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lw $4, 52($29)
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lw $5, 48($29)
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lw $6, 44($29)
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lw $7, 40($29)
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lw $31, 36($29)
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lw $30, 32($29)
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lw $16, 28($29)
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lw $17, 24($29)
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lw $18, 20($29)
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lw $19, 16($29)
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lw $20, 12($29)
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lw $21, 8($29)
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lw $22, 4($29)
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lw $23, 0($29)
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addu $29, $29, 56 #release the stack frame.
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jr $31
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nop
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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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.previous
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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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#endif // defined(VGP_mips32_linux)
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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