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Diffstat (limited to 'coregrind/m_syswrap/.svn/text-base/syscall-ppc64-linux.S.svn-base')
| -rw-r--r-- | coregrind/m_syswrap/.svn/text-base/syscall-ppc64-linux.S.svn-base | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/coregrind/m_syswrap/.svn/text-base/syscall-ppc64-linux.S.svn-base b/coregrind/m_syswrap/.svn/text-base/syscall-ppc64-linux.S.svn-base new file mode 100644 index 0000000..5e17995 --- /dev/null +++ b/coregrind/m_syswrap/.svn/text-base/syscall-ppc64-linux.S.svn-base @@ -0,0 +1,168 @@ + +/*--------------------------------------------------------------------*/ +/*--- Support for doing system calls. syscall-ppc64-linux.S ---*/ +/*--------------------------------------------------------------------*/ + +/* + This file is part of Valgrind, a dynamic binary instrumentation + framework. + + Copyright (C) 2005-2009 Paul Mackerras <paulus@samba.org> + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307, USA. + + The GNU General Public License is contained in the file COPYING. +*/ + +#include "pub_core_basics_asm.h" +#include "pub_core_vkiscnums.h" +#include "libvex_guest_offsets.h" + + +/*----------------------------------------------------------------*/ +/* + Perform a syscall for the client. This will run a syscall + with the client's specific per-thread signal mask. + + The structure of this function is such that, if the syscall is + interrupted by a signal, we can determine exactly what + execution state we were in with respect to the execution of + the syscall by examining the value of NIP in the signal + handler. This means that we can always do the appropriate + thing to precisely emulate the kernel's signal/syscall + interactions. + + The syscall number is taken from the argument, even though it + should also be in regs->m_gpr[0]. The syscall result is written + back to regs->m_gpr[3]/m_xer/m_result on completion. + + Returns 0 if the syscall was successfully called (even if the + syscall itself failed), or a nonzero error code in the lowest + 8 bits if one of the sigprocmasks failed (there's no way to + determine which one failed). And there's no obvious way to + recover from that either, but nevertheless we want to know. + + VG_(fixup_guest_state_after_syscall_interrupted) does the + thread state fixup in the case where we were interrupted by a + signal. + + Prototype: + + UWord ML_(do_syscall_for_client_WRK)( + Int syscallno, // r3 + void* guest_state, // r4 + const vki_sigset_t *sysmask, // r5 + const vki_sigset_t *postmask, // r6 + Int nsigwords) // r7 +*/ +/* from vki_arch.h */ +#define VKI_SIG_SETMASK 2 + +.align 2 +.globl ML_(do_syscall_for_client_WRK) +.section ".opd","aw" +.align 3 +ML_(do_syscall_for_client_WRK): +.quad .ML_(do_syscall_for_client_WRK),.TOC.@tocbase,0 +.previous +.type .ML_(do_syscall_for_client_WRK),@function +.globl .ML_(do_syscall_for_client_WRK) +.ML_(do_syscall_for_client_WRK): + /* make a stack frame */ + stdu 1,-80(1) + std 31,72(1) + std 30,64(1) + std 29,56(1) + std 28,48(1) + mr 31,3 /* syscall number */ + mr 30,4 /* guest_state */ + mr 29,6 /* postmask */ + mr 28,7 /* nsigwords */ + + /* set the signal mask for doing the system call */ + /* set up for sigprocmask(SIG_SETMASK, sysmask, postmask) */ +1: li 0,__NR_rt_sigprocmask + li 3,VKI_SIG_SETMASK + mr 4,5 + mr 5,6 + mr 6,7 + sc /* set the mask */ + bso 7f /* if the sigprocmask fails */ + + /* load up syscall args from the threadstate */ + ld 3,OFFSET_ppc64_GPR3(30) + ld 4,OFFSET_ppc64_GPR4(30) + ld 5,OFFSET_ppc64_GPR5(30) + ld 6,OFFSET_ppc64_GPR6(30) + ld 7,OFFSET_ppc64_GPR7(30) + ld 8,OFFSET_ppc64_GPR8(30) + mr 0,31 /* syscall number */ +2: sc /* do the syscall */ + + /* put the result back in the threadstate */ +3: std 3,OFFSET_ppc64_GPR3(30) /* gst->GPR3 = sc result */ + /* copy cr0.so back to simulated state */ + mfcr 5 /* r5 = CR */ + rlwinm 5,5,4,31,31 /* r5 = (CR >> 28) & 1 */ + stb 5,OFFSET_ppc64_CR0_0(30) /* gst->CR0.SO = cr0.so */ + + /* block signals again */ + /* set up for sigprocmask(SIG_SETMASK, postmask, NULL) */ +4: li 0,__NR_rt_sigprocmask + li 3,VKI_SIG_SETMASK + mr 4,29 + li 5,0 + mr 6,28 + sc /* set the mask */ + bso 7f /* if the sigprocmask fails */ + /* now safe from signals */ + li 3,0 /* SUCCESS */ + + /* pop off stack frame */ +5: ld 28,48(1) + ld 29,56(1) + ld 30,64(1) + ld 31,72(1) + addi 1,1,80 + blr + + /* failure: return 0x8000 | error code */ +7: ori 3,3,0x8000 /* FAILURE -- ensure return value is nonzero */ + b 5b + +.section .rodata +/* export the ranges so that + VG_(fixup_guest_state_after_syscall_interrupted) can do the + right thing */ + +.globl ML_(blksys_setup) +.globl ML_(blksys_restart) +.globl ML_(blksys_complete) +.globl ML_(blksys_committed) +.globl ML_(blksys_finished) +ML_(blksys_setup): .quad 1b +ML_(blksys_restart): .quad 2b +ML_(blksys_complete): .quad 3b +ML_(blksys_committed): .quad 4b +ML_(blksys_finished): .quad 5b + + +/* Let the linker know we don't need an executable stack */ +.section .note.GNU-stack,"",@progbits + +/*--------------------------------------------------------------------*/ +/*--- end ---*/ +/*--------------------------------------------------------------------*/ |