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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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173 lines
6.0 KiB
ArmAsm
173 lines
6.0 KiB
ArmAsm
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/*--------------------------------------------------------------------*/
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/*--- Support for doing system calls. syscall-ppc64-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) 2005-2011 Paul Mackerras <paulus@samba.org>
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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_ppc64_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 NIP 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_gpr[0]. The syscall result is written
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back to regs->m_gpr[3]/m_xer/m_result 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, // r3
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void* guest_state, // r4
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const vki_sigset_t *sysmask, // r5
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const vki_sigset_t *postmask, // r6
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Int sigsetSzB) // r7
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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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.align 2
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.globl ML_(do_syscall_for_client_WRK)
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.section ".opd","aw"
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.align 3
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ML_(do_syscall_for_client_WRK):
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.quad .ML_(do_syscall_for_client_WRK),.TOC.@tocbase,0
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.previous
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.type .ML_(do_syscall_for_client_WRK),@function
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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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/* make a stack frame */
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stdu 1,-80(1)
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std 31,72(1)
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std 30,64(1)
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std 29,56(1)
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std 28,48(1)
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mr 31,3 /* syscall number */
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mr 30,4 /* guest_state */
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mr 29,6 /* postmask */
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mr 28,7 /* sigsetSzB */
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/* set the signal mask for doing the system call */
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/* set up for sigprocmask(SIG_SETMASK, sysmask, postmask) */
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1: li 0,__NR_rt_sigprocmask
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li 3,VKI_SIG_SETMASK
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mr 4,5
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mr 5,6
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mr 6,7
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sc /* set the mask */
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bso 7f /* if the sigprocmask fails */
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/* load up syscall args from the threadstate */
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ld 3,OFFSET_ppc64_GPR3(30)
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ld 4,OFFSET_ppc64_GPR4(30)
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ld 5,OFFSET_ppc64_GPR5(30)
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ld 6,OFFSET_ppc64_GPR6(30)
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ld 7,OFFSET_ppc64_GPR7(30)
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ld 8,OFFSET_ppc64_GPR8(30)
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mr 0,31 /* syscall number */
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2: sc /* do the syscall */
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/* put the result back in the threadstate */
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3: std 3,OFFSET_ppc64_GPR3(30) /* gst->GPR3 = sc result */
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/* copy cr0.so back to simulated state */
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mfcr 5 /* r5 = CR */
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rlwinm 5,5,4,31,31 /* r5 = (CR >> 28) & 1 */
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stb 5,OFFSET_ppc64_CR0_0(30) /* gst->CR0.SO = cr0.so */
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/* block signals again */
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/* set up for sigprocmask(SIG_SETMASK, postmask, NULL) */
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4: li 0,__NR_rt_sigprocmask
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li 3,VKI_SIG_SETMASK
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mr 4,29
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li 5,0
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mr 6,28
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sc /* set the mask */
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bso 7f /* if the sigprocmask fails */
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/* now safe from signals */
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li 3,0 /* SUCCESS */
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/* pop off stack frame */
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5: ld 28,48(1)
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ld 29,56(1)
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ld 30,64(1)
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ld 31,72(1)
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addi 1,1,80
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blr
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/* failure: return 0x8000 | error code */
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7: ori 3,3,0x8000 /* FAILURE -- ensure return value is nonzero */
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b 5b
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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): .quad 1b
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ML_(blksys_restart): .quad 2b
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ML_(blksys_complete): .quad 3b
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ML_(blksys_committed): .quad 4b
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ML_(blksys_finished): .quad 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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#endif // defined(VGP_ppc64_linux)
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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