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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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223 lines
6.8 KiB
ArmAsm
223 lines
6.8 KiB
ArmAsm
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/*--------------------------------------------------------------------*/
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/*--- Support for doing system calls. syscall-ppc32-aix5.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) 2006-2009 OpenWorks LLP
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info@open-works.co.uk
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Derived from Paul Mackerras' implementation of same for ppc32-linux
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in syscall-ppc32-linux.S.
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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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#include "pub_core_basics_asm.h"
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#include "libvex_guest_offsets.h"
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/* kludge: from include/vki/vki-ppc32-aix5.h */
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#define VKI_SIG_SETMASK 2
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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 R2 in guest_state. The syscall result is written
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back to R3 and R4 in the guest state 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 nsigwords, // r7
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Int __nr_sigprocmask) // r8
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*/
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.file "syscall-ppc32-aix6.S"
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.toc
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.csect .text[PR]
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.align 2
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.globl ML_(do_syscall_for_client_WRK)
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.globl .ML_(do_syscall_for_client_WRK)
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.csect ML_(do_syscall_for_client_WRK)[DS]
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ML_(do_syscall_for_client_WRK):
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.long .ML_(do_syscall_for_client_WRK), TOC[tc0], 0
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.csect .text[PR]
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.ML_(do_syscall_for_client_WRK):
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/* make a stack frame */
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stwu 1,-512(1)
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stw 31,256(1)
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stw 30,260(1)
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stw 29,264(1)
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stw 28,268(1)
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stw 27,272(1)
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stw 26,276(1)
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mflr 26
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stw 26,280(1)
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stw 2,284(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 /* nsigwords */
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mr 27,8 /* __nr_sigprocmask */
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Lvg1: /* Even though we can't take a signal until the sigprocmask
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completes, start the range early. If PC is in the range [1,2),
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the syscall hasn't been started yet */
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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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mr 2,8
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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 /* nsigwords -- needed on AIX ? */
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/* actually do the sigprocmask */
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crorc 6,6,6
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.long 0x48000005 /* bl here+4 */
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mflr 26
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addi 26,26,16
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mtlr 26
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sc
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/* did it fail? (assuming r3 == 0 for success) */
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cmpwi 0,3,0
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bne 0,Lvg7
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/* load up syscall args from the threadstate */
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lwz 3,OFFSET_ppc32_GPR3(30)
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lwz 4,OFFSET_ppc32_GPR4(30)
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lwz 5,OFFSET_ppc32_GPR5(30)
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lwz 6,OFFSET_ppc32_GPR6(30)
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lwz 7,OFFSET_ppc32_GPR7(30)
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lwz 8,OFFSET_ppc32_GPR8(30)
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lwz 9,OFFSET_ppc32_GPR9(30)
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lwz 10,OFFSET_ppc32_GPR10(30)
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mr 2,31 /* syscall number */
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crorc 6,6,6
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.long 0x48000005 /* bl here+4 */
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mflr 26
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addi 26,26,16
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mtlr 26
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/* If PC is in the range [2,2], then the syscall was either
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just about to start, or was interrupted and the kernel was
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restarting it. */
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Lvg2: sc /* do the syscall */
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/* In the range [3, 4), the syscall result is in r3/r4, but
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hasn't been committed to R3/R4. */
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/* put the result back in the threadstate */
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Lvg3: stw 3,OFFSET_ppc32_GPR3(30) /* gst->GPR3 = res */
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stw 4,OFFSET_ppc32_GPR4(30) /* gst->GPR4 = err */
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/* Block signals again. If PC is in [4,5), then the syscall
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is complete and we needn't worry about it. */
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/* set up for sigprocmask(SIG_SETMASK, postmask, NULL) */
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Lvg4: mr 2,27
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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 /* nsigwords -- needed on AIX ? */
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/* actually do the sigprocmask */
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crorc 6,6,6
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.long 0x48000005 /* bl here+4 */
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mflr 26
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addi 26,26,16
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mtlr 26
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sc
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/* did it fail? (assuming r3 == 0 for success) */
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cmpwi 0,3,0
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bne 0,Lvg7
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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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Lvg5: lwz 2,284(1)
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lwz 26,280(1)
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mtlr 26
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lwz 26,276(1)
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lwz 27,272(1)
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lwz 28,268(1)
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lwz 29,264(1)
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lwz 30,260(1)
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lwz 31,256(1)
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addi 1,1,512
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blr
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/* failure: return 0x8000 | error code */
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Lvg7: mr 3,4
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ori 3,3,0x8000 /* FAILURE -- ensure return value is nonzero */
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b Lvg5
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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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.csect .data[RW],3
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.align 2
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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 Lvg1
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ML_(blksys_restart): .long Lvg2
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ML_(blksys_complete): .long Lvg3
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ML_(blksys_committed): .long Lvg4
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ML_(blksys_finished): .long Lvg5
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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