1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- Support for doing system calls. syscall-ppc32-linux.S ---*/ 4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* 7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This file is part of Valgrind, a dynamic binary instrumentation 8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown framework. 9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 10436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanov Copyright (C) 2005-2013 Paul Mackerras (paulus@samba.org) 11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is free software; you can redistribute it and/or 13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown modify it under the terms of the GNU General Public License as 14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown published by the Free Software Foundation; either version 2 of the 15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown License, or (at your option) any later version. 16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is distributed in the hope that it will be useful, but 18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown WITHOUT ANY WARRANTY; without even the implied warranty of 19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown General Public License for more details. 21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown You should have received a copy of the GNU General Public License 23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown along with this program; if not, write to the Free Software 24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 02111-1307, USA. 26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The GNU General Public License is contained in the file COPYING. 28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if defined(VGP_ppc32_linux) 31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_basics_asm.h" 33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_vkiscnums_asm.h" 34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "libvex_guest_offsets.h" 35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*----------------------------------------------------------------*/ 38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* 39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Perform a syscall for the client. This will run a syscall 40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown with the client's specific per-thread signal mask. 41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The structure of this function is such that, if the syscall is 43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown interrupted by a signal, we can determine exactly what 44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown execution state we were in with respect to the execution of 45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown the syscall by examining the value of NIP in the signal 46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown handler. This means that we can always do the appropriate 47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown thing to precisely emulate the kernel's signal/syscall 48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown interactions. 49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The syscall number is taken from the argument, even though it 51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown should also be in regs->m_gpr[0]. The syscall result is written 52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown back to regs->m_gpr[3]/m_xer/m_result on completion. 53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Returns 0 if the syscall was successfully called (even if the 55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown syscall itself failed), or a nonzero error code in the lowest 56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 8 bits if one of the sigprocmasks failed (there's no way to 57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown determine which one failed). And there's no obvious way to 58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown recover from that either, but nevertheless we want to know. 59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(fixup_guest_state_after_syscall_interrupted) does the 61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown thread state fixup in the case where we were interrupted by a 62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown signal. 63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 64ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Prototype: 65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UWord ML_(do_syscall_for_client_WRK)( 67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int syscallno, // r3 68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown void* guest_state, // r4 69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown const vki_sigset_t *sysmask, // r5 70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown const vki_sigset_t *postmask, // r6 71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int sigsetSzB) // r7 72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* from vki_arch.h */ 74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#define VKI_SIG_SETMASK 2 75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 76ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown.globl ML_(do_syscall_for_client_WRK) 77ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownML_(do_syscall_for_client_WRK): 78ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* make a stack frame */ 79ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown stwu 1,-32(1) 80ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown stw 31,28(1) 81ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown stw 30,24(1) 82ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown stw 29,20(1) 83ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown stw 28,16(1) 84ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 31,3 /* syscall number */ 85ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 30,4 /* guest_state */ 86ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 29,6 /* postmask */ 87ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 28,7 /* sigsetSzB */ 88ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 89ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* set the signal mask for doing the system call */ 90ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* set up for sigprocmask(SIG_SETMASK, sysmask, postmask) */ 91ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown1: li 0,__NR_rt_sigprocmask 92ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown li 3,VKI_SIG_SETMASK 93ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 4,5 94ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 5,6 95ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 6,7 96ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sc /* set the mask */ 97ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown bso 7f /* if the sigprocmask fails */ 98ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 99ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* load up syscall args from the threadstate */ 100ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lwz 3,OFFSET_ppc32_GPR3(30) 101ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lwz 4,OFFSET_ppc32_GPR4(30) 102ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lwz 5,OFFSET_ppc32_GPR5(30) 103ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lwz 6,OFFSET_ppc32_GPR6(30) 104ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lwz 7,OFFSET_ppc32_GPR7(30) 105ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lwz 8,OFFSET_ppc32_GPR8(30) 106ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 0,31 /* syscall number */ 107ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown2: sc /* do the syscall */ 108ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 109ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* put the result back in the threadstate */ 110ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown3: stw 3,OFFSET_ppc32_GPR3(30) /* gst->GPR3 = sc result */ 111ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* copy cr0.so back to simulated state */ 112ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mfcr 5 /* r5 = CR */ 113ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown rlwinm 5,5,4,31,31 /* r5 = (CR >> 28) & 1 */ 114ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown stb 5,OFFSET_ppc32_CR0_0(30) /* gst->CR0.SO = cr0.so */ 115ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 116ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* block signals again */ 117ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* set up for sigprocmask(SIG_SETMASK, postmask, NULL) */ 118ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown4: li 0,__NR_rt_sigprocmask 119ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown li 3,VKI_SIG_SETMASK 120ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 4,29 121ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown li 5,0 122ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown mr 6,28 123ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sc /* set the mask */ 124ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown bso 7f /* if the sigprocmask fails */ 125ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* now safe from signals */ 126ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown li 3,0 /* SUCCESS */ 127ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 128ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* pop off stack frame */ 129ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown5: lwz 28,16(1) 130ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lwz 29,20(1) 131ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lwz 30,24(1) 132ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lwz 31,28(1) 133ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown addi 1,1,32 134ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blr 135ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 136ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* failure: return 0x8000 | error code */ 137ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown7: ori 3,3,0x8000 /* FAILURE -- ensure return value is nonzero */ 138ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown b 5b 139ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 140ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown.section .rodata 141ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* export the ranges so that 142ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(fixup_guest_state_after_syscall_interrupted) can do the 143ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown right thing */ 144ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 145ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown.globl ML_(blksys_setup) 146ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown.globl ML_(blksys_restart) 147ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown.globl ML_(blksys_complete) 148ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown.globl ML_(blksys_committed) 149ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown.globl ML_(blksys_finished) 150ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownML_(blksys_setup): .long 1b 151ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownML_(blksys_restart): .long 2b 152ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownML_(blksys_complete): .long 3b 153ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownML_(blksys_committed): .long 4b 154ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownML_(blksys_finished): .long 5b 155ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 156ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown.previous 157ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 158ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* Let the linker know we don't need an executable stack */ 159ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown.section .note.GNU-stack,"",@progbits 160ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 161ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif // defined(VGP_ppc32_linux) 162ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 163ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 164ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- end ---*/ 165ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 166