| |
| /*--------------------------------------------------------------------*/ |
| /*--- Support for doing system calls. syscall-ppc32-aix5.S ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2006-2009 OpenWorks LLP |
| info@open-works.co.uk |
| |
| Derived from Paul Mackerras' implementation of same for ppc32-linux |
| in syscall-ppc32-linux.S. |
| |
| 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. |
| */ |
| |
| #if defined(VGP_ppc32_aix5) |
| |
| #include "pub_core_basics_asm.h" |
| #include "libvex_guest_offsets.h" |
| |
| /* kludge: from include/vki/vki-ppc32-aix5.h */ |
| #define VKI_SIG_SETMASK 2 |
| |
| |
| /*----------------------------------------------------------------*/ |
| /* |
| 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 R2 in guest_state. The syscall result is written |
| back to R3 and R4 in the guest state 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 sigsetSzB, // r7 |
| Int __nr_sigprocmask) // r8 |
| */ |
| .file "syscall-ppc32-aix6.S" |
| |
| .toc |
| .csect .text[PR] |
| .align 2 |
| .globl ML_(do_syscall_for_client_WRK) |
| .globl .ML_(do_syscall_for_client_WRK) |
| .csect ML_(do_syscall_for_client_WRK)[DS] |
| ML_(do_syscall_for_client_WRK): |
| .long .ML_(do_syscall_for_client_WRK), TOC[tc0], 0 |
| .csect .text[PR] |
| .ML_(do_syscall_for_client_WRK): |
| /* make a stack frame */ |
| stwu 1,-512(1) |
| stw 31,256(1) |
| stw 30,260(1) |
| stw 29,264(1) |
| stw 28,268(1) |
| stw 27,272(1) |
| stw 26,276(1) |
| mflr 26 |
| stw 26,280(1) |
| stw 2,284(1) |
| mr 31,3 /* syscall number */ |
| mr 30,4 /* guest_state */ |
| mr 29,6 /* postmask */ |
| mr 28,7 /* sigsetSzB */ |
| mr 27,8 /* __nr_sigprocmask */ |
| |
| Lvg1: /* Even though we can't take a signal until the sigprocmask |
| completes, start the range early. If PC is in the range [1,2), |
| the syscall hasn't been started yet */ |
| |
| /* set the signal mask for doing the system call */ |
| /* set up for sigprocmask(SIG_SETMASK, sysmask, postmask) */ |
| mr 2,8 |
| li 3,VKI_SIG_SETMASK |
| mr 4,5 |
| mr 5,6 |
| mr 6,7 /* sigsetSzB -- needed on AIX ? */ |
| |
| /* actually do the sigprocmask */ |
| crorc 6,6,6 |
| .long 0x48000005 /* bl here+4 */ |
| mflr 26 |
| addi 26,26,16 |
| mtlr 26 |
| sc |
| |
| /* did it fail? (assuming r3 == 0 for success) */ |
| cmpwi 0,3,0 |
| bne 0,Lvg7 |
| |
| /* load up syscall args from the threadstate */ |
| lwz 3,OFFSET_ppc32_GPR3(30) |
| lwz 4,OFFSET_ppc32_GPR4(30) |
| lwz 5,OFFSET_ppc32_GPR5(30) |
| lwz 6,OFFSET_ppc32_GPR6(30) |
| lwz 7,OFFSET_ppc32_GPR7(30) |
| lwz 8,OFFSET_ppc32_GPR8(30) |
| lwz 9,OFFSET_ppc32_GPR9(30) |
| lwz 10,OFFSET_ppc32_GPR10(30) |
| mr 2,31 /* syscall number */ |
| |
| crorc 6,6,6 |
| .long 0x48000005 /* bl here+4 */ |
| mflr 26 |
| addi 26,26,16 |
| mtlr 26 |
| |
| /* If PC is in the range [2,2], then the syscall was either |
| just about to start, or was interrupted and the kernel was |
| restarting it. */ |
| Lvg2: sc /* do the syscall */ |
| |
| /* In the range [3, 4), the syscall result is in r3/r4, but |
| hasn't been committed to R3/R4. */ |
| /* put the result back in the threadstate */ |
| |
| Lvg3: stw 3,OFFSET_ppc32_GPR3(30) /* gst->GPR3 = res */ |
| stw 4,OFFSET_ppc32_GPR4(30) /* gst->GPR4 = err */ |
| |
| /* Block signals again. If PC is in [4,5), then the syscall |
| is complete and we needn't worry about it. */ |
| /* set up for sigprocmask(SIG_SETMASK, postmask, NULL) */ |
| Lvg4: mr 2,27 |
| li 3,VKI_SIG_SETMASK |
| mr 4,29 |
| li 5,0 |
| mr 6,28 /* sigsetSzB -- needed on AIX ? */ |
| |
| /* actually do the sigprocmask */ |
| crorc 6,6,6 |
| .long 0x48000005 /* bl here+4 */ |
| mflr 26 |
| addi 26,26,16 |
| mtlr 26 |
| sc |
| |
| /* did it fail? (assuming r3 == 0 for success) */ |
| cmpwi 0,3,0 |
| bne 0,Lvg7 |
| |
| /* now safe from signals */ |
| li 3,0 /* SUCCESS */ |
| |
| /* pop off stack frame */ |
| Lvg5: lwz 2,284(1) |
| lwz 26,280(1) |
| mtlr 26 |
| lwz 26,276(1) |
| lwz 27,272(1) |
| lwz 28,268(1) |
| lwz 29,264(1) |
| lwz 30,260(1) |
| lwz 31,256(1) |
| addi 1,1,512 |
| blr |
| |
| /* failure: return 0x8000 | error code */ |
| Lvg7: mr 3,4 |
| ori 3,3,0x8000 /* FAILURE -- ensure return value is nonzero */ |
| b Lvg5 |
| |
| /* export the ranges so that |
| VG_(fixup_guest_state_after_syscall_interrupted) can do the |
| right thing */ |
| |
| .csect .data[RW],3 |
| .align 2 |
| .globl ML_(blksys_setup) |
| .globl ML_(blksys_restart) |
| .globl ML_(blksys_complete) |
| .globl ML_(blksys_committed) |
| .globl ML_(blksys_finished) |
| ML_(blksys_setup): .long Lvg1 |
| ML_(blksys_restart): .long Lvg2 |
| ML_(blksys_complete): .long Lvg3 |
| ML_(blksys_committed): .long Lvg4 |
| ML_(blksys_finished): .long Lvg5 |
| |
| #endif // defined(VGP_ppc32_aix5) |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end ---*/ |
| /*--------------------------------------------------------------------*/ |