blob: 7be2f6a9acf8fe881b15bca1e26fd55f49004cce [file] [log] [blame]
/*--------------------------------------------------------------------*/
/*--- Support for doing system calls. syscall-tilegx-linux.S ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2010-2012 Tilera Corp.
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.
*/
/* Contributed by Zhi-Gang Liu <zliu at tilera dot com> */
#include "pub_core_basics_asm.h"
#if defined(VGP_tilegx_linux)
#include "pub_core_vkiscnums_asm.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 IP 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->v0. The syscall result is written
back to regs->v0 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, // r0
void* guest_state, // r1
const vki_sigset_t *sysmask, // r2
const vki_sigset_t *postmask, // r3
Int nsigwords) // r4
*/
/* from vki_arch.h */
#define VKI_SIG_SETMASK 2
.globl ML_(do_syscall_for_client_WRK)
ML_(do_syscall_for_client_WRK):
addli sp, sp, -64 // alloc 64B new stack space
addli r29, sp, 56 // r29 points to offset 56 above sp
st_add r29, r0, -8 // save r0
// offset 48
st_add r29, r1, -8 // save r1
// offset 40
st_add r29, r2, -8 // save r2
// offset 32
st_add r29, r3, -8 // save r3
// offset 24
st_add r29, r4, -8 // save r4
// offset 16
st r29, lr // save lr
1:
{
moveli r10, __NR_rt_sigprocmask
moveli r0, VKI_SIG_SETMASK
}
{
move r1, r2
move r2, r3
}
move r3, r4
swint1
// error, go 7f
bnez r1, 7f
/* Get registers from guest_state. */
addli r29, sp, 56 // get syscallno
ld r10, r29
addli r29, sp, 48
ld r29, r29 // r29 points to guest_state
ld_add r0, r29, 8 // read r0
ld_add r1, r29, 8 // read r1
ld_add r2, r29, 8 // read r2
ld_add r3, r29, 8 // read r3
ld_add r4, r29, 8 // read r4
ld_add r5, r29, 8 // read r5
2: swint1 // syscall
3:
// Write register into guest_state
addli r29, sp, 48
ld r29, r29
st_add r29, r0, 8
st_add r29, r1, 8
st_add r29, r2, 8
st_add r29, r3, 8
st_add r29, r4, 8
st_add r29, r5, 8
nop
4:
{
moveli r10, __NR_rt_sigprocmask
moveli r0, VKI_SIG_SETMASK
}
addli r29, sp, 32
{
ld r1, r29
movei r2, 0
}
addli r29, sp, 24
ld r3, r29
swint1
// error, go 7f
bnez r1, 7f
nop
5: addli r29, sp, 16
{
ld lr, r29 // restore lr
addli sp, sp, 64
}
jr lr
7: addi r29, sp, 16
{
ld lr, r29 // restore lr
addi sp, sp, 64
}
{
// r0 = 0x8000
shl16insli r0, zero, -0x8000
jr lr
}
.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
.previous
#endif /* defined(VGP_tilegx_linux) */
/* Let the linker know we don't need an executable stack */
MARK_STACK_NO_EXEC
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/