mirror of
https://github.com/qemu/qemu.git
synced 2024-12-03 16:53:53 +08:00
linux-user: Untabify all safe-syscall.inc.S
Reviewed-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Suggested-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson
parent
212a33d3b0
commit
b9d2af3c62
@ -10,66 +10,66 @@
|
||||
* See the COPYING file in the top-level directory.
|
||||
*/
|
||||
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, #function
|
||||
.type safe_syscall_start, #function
|
||||
.type safe_syscall_end, #function
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, #function
|
||||
.type safe_syscall_start, #function
|
||||
.type safe_syscall_end, #function
|
||||
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
safe_syscall_base:
|
||||
.cfi_startproc
|
||||
/* The syscall calling convention isn't the same as the
|
||||
* C one:
|
||||
* we enter with x0 == *signal_pending
|
||||
* x1 == syscall number
|
||||
* x2 ... x7, (stack) == syscall arguments
|
||||
* and return the result in x0
|
||||
* and the syscall instruction needs
|
||||
* x8 == syscall number
|
||||
* x0 ... x6 == syscall arguments
|
||||
* and returns the result in x0
|
||||
* Shuffle everything around appropriately.
|
||||
*/
|
||||
mov x9, x0 /* signal_pending pointer */
|
||||
mov x8, x1 /* syscall number */
|
||||
mov x0, x2 /* syscall arguments */
|
||||
mov x1, x3
|
||||
mov x2, x4
|
||||
mov x3, x5
|
||||
mov x4, x6
|
||||
mov x5, x7
|
||||
ldr x6, [sp]
|
||||
.cfi_startproc
|
||||
/* The syscall calling convention isn't the same as the
|
||||
* C one:
|
||||
* we enter with x0 == *signal_pending
|
||||
* x1 == syscall number
|
||||
* x2 ... x7, (stack) == syscall arguments
|
||||
* and return the result in x0
|
||||
* and the syscall instruction needs
|
||||
* x8 == syscall number
|
||||
* x0 ... x6 == syscall arguments
|
||||
* and returns the result in x0
|
||||
* Shuffle everything around appropriately.
|
||||
*/
|
||||
mov x9, x0 /* signal_pending pointer */
|
||||
mov x8, x1 /* syscall number */
|
||||
mov x0, x2 /* syscall arguments */
|
||||
mov x1, x3
|
||||
mov x2, x4
|
||||
mov x3, x5
|
||||
mov x4, x6
|
||||
mov x5, x7
|
||||
ldr x6, [sp]
|
||||
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
safe_syscall_start:
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
ldr w10, [x9]
|
||||
cbnz w10, 0f
|
||||
svc 0x0
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
ldr w10, [x9]
|
||||
cbnz w10, 0f
|
||||
svc 0x0
|
||||
safe_syscall_end:
|
||||
/* code path for having successfully executed the syscall */
|
||||
ret
|
||||
/* code path for having successfully executed the syscall */
|
||||
ret
|
||||
|
||||
0:
|
||||
/* code path when we didn't execute the syscall */
|
||||
mov x0, #-TARGET_ERESTARTSYS
|
||||
ret
|
||||
.cfi_endproc
|
||||
/* code path when we didn't execute the syscall */
|
||||
mov x0, #-TARGET_ERESTARTSYS
|
||||
ret
|
||||
.cfi_endproc
|
||||
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
|
||||
@ -10,81 +10,81 @@
|
||||
* See the COPYING file in the top-level directory.
|
||||
*/
|
||||
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, %function
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, %function
|
||||
|
||||
.cfi_sections .debug_frame
|
||||
.cfi_sections .debug_frame
|
||||
|
||||
.text
|
||||
.syntax unified
|
||||
.arm
|
||||
.align 2
|
||||
.text
|
||||
.syntax unified
|
||||
.arm
|
||||
.align 2
|
||||
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
safe_syscall_base:
|
||||
.fnstart
|
||||
.cfi_startproc
|
||||
mov r12, sp /* save entry stack */
|
||||
push { r4, r5, r6, r7, r8, lr }
|
||||
.save { r4, r5, r6, r7, r8, lr }
|
||||
.cfi_adjust_cfa_offset 24
|
||||
.cfi_rel_offset r4, 0
|
||||
.cfi_rel_offset r5, 4
|
||||
.cfi_rel_offset r6, 8
|
||||
.cfi_rel_offset r7, 12
|
||||
.cfi_rel_offset r8, 16
|
||||
.cfi_rel_offset lr, 20
|
||||
.fnstart
|
||||
.cfi_startproc
|
||||
mov r12, sp /* save entry stack */
|
||||
push { r4, r5, r6, r7, r8, lr }
|
||||
.save { r4, r5, r6, r7, r8, lr }
|
||||
.cfi_adjust_cfa_offset 24
|
||||
.cfi_rel_offset r4, 0
|
||||
.cfi_rel_offset r5, 4
|
||||
.cfi_rel_offset r6, 8
|
||||
.cfi_rel_offset r7, 12
|
||||
.cfi_rel_offset r8, 16
|
||||
.cfi_rel_offset lr, 20
|
||||
|
||||
/* The syscall calling convention isn't the same as the C one:
|
||||
* we enter with r0 == *signal_pending
|
||||
* r1 == syscall number
|
||||
* r2, r3, [sp+0] ... [sp+12] == syscall arguments
|
||||
* and return the result in r0
|
||||
* and the syscall instruction needs
|
||||
* r7 == syscall number
|
||||
* r0 ... r6 == syscall arguments
|
||||
* and returns the result in r0
|
||||
* Shuffle everything around appropriately.
|
||||
* Note the 16 bytes that we pushed to save registers.
|
||||
*/
|
||||
mov r8, r0 /* copy signal_pending */
|
||||
mov r7, r1 /* syscall number */
|
||||
mov r0, r2 /* syscall args */
|
||||
mov r1, r3
|
||||
ldm r12, { r2, r3, r4, r5, r6 }
|
||||
/* The syscall calling convention isn't the same as the C one:
|
||||
* we enter with r0 == *signal_pending
|
||||
* r1 == syscall number
|
||||
* r2, r3, [sp+0] ... [sp+12] == syscall arguments
|
||||
* and return the result in r0
|
||||
* and the syscall instruction needs
|
||||
* r7 == syscall number
|
||||
* r0 ... r6 == syscall arguments
|
||||
* and returns the result in r0
|
||||
* Shuffle everything around appropriately.
|
||||
* Note the 16 bytes that we pushed to save registers.
|
||||
*/
|
||||
mov r8, r0 /* copy signal_pending */
|
||||
mov r7, r1 /* syscall number */
|
||||
mov r0, r2 /* syscall args */
|
||||
mov r1, r3
|
||||
ldm r12, { r2, r3, r4, r5, r6 }
|
||||
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
safe_syscall_start:
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
ldr r12, [r8] /* signal_pending */
|
||||
tst r12, r12
|
||||
bne 1f
|
||||
swi 0
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
ldr r12, [r8] /* signal_pending */
|
||||
tst r12, r12
|
||||
bne 1f
|
||||
swi 0
|
||||
safe_syscall_end:
|
||||
/* code path for having successfully executed the syscall */
|
||||
pop { r4, r5, r6, r7, r8, pc }
|
||||
/* code path for having successfully executed the syscall */
|
||||
pop { r4, r5, r6, r7, r8, pc }
|
||||
|
||||
1:
|
||||
/* code path when we didn't execute the syscall */
|
||||
ldr r0, =-TARGET_ERESTARTSYS
|
||||
pop { r4, r5, r6, r7, r8, pc }
|
||||
.fnend
|
||||
.cfi_endproc
|
||||
/* code path when we didn't execute the syscall */
|
||||
ldr r0, =-TARGET_ERESTARTSYS
|
||||
pop { r4, r5, r6, r7, r8, pc }
|
||||
.fnend
|
||||
.cfi_endproc
|
||||
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
|
||||
@ -10,91 +10,91 @@
|
||||
* See the COPYING file in the top-level directory.
|
||||
*/
|
||||
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, @function
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, @function
|
||||
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
safe_syscall_base:
|
||||
.cfi_startproc
|
||||
push %ebp
|
||||
.cfi_adjust_cfa_offset 4
|
||||
.cfi_rel_offset ebp, 0
|
||||
push %esi
|
||||
.cfi_adjust_cfa_offset 4
|
||||
.cfi_rel_offset esi, 0
|
||||
push %edi
|
||||
.cfi_adjust_cfa_offset 4
|
||||
.cfi_rel_offset edi, 0
|
||||
push %ebx
|
||||
.cfi_adjust_cfa_offset 4
|
||||
.cfi_rel_offset ebx, 0
|
||||
.cfi_startproc
|
||||
push %ebp
|
||||
.cfi_adjust_cfa_offset 4
|
||||
.cfi_rel_offset ebp, 0
|
||||
push %esi
|
||||
.cfi_adjust_cfa_offset 4
|
||||
.cfi_rel_offset esi, 0
|
||||
push %edi
|
||||
.cfi_adjust_cfa_offset 4
|
||||
.cfi_rel_offset edi, 0
|
||||
push %ebx
|
||||
.cfi_adjust_cfa_offset 4
|
||||
.cfi_rel_offset ebx, 0
|
||||
|
||||
/* The syscall calling convention isn't the same as the C one:
|
||||
* we enter with 0(%esp) == return address
|
||||
* 4(%esp) == *signal_pending
|
||||
* 8(%esp) == syscall number
|
||||
* 12(%esp) ... 32(%esp) == syscall arguments
|
||||
* and return the result in eax
|
||||
* and the syscall instruction needs
|
||||
* eax == syscall number
|
||||
* ebx, ecx, edx, esi, edi, ebp == syscall arguments
|
||||
* and returns the result in eax
|
||||
* Shuffle everything around appropriately.
|
||||
* Note the 16 bytes that we pushed to save registers.
|
||||
*/
|
||||
mov 12+16(%esp), %ebx /* the syscall arguments */
|
||||
mov 16+16(%esp), %ecx
|
||||
mov 20+16(%esp), %edx
|
||||
mov 24+16(%esp), %esi
|
||||
mov 28+16(%esp), %edi
|
||||
mov 32+16(%esp), %ebp
|
||||
/* The syscall calling convention isn't the same as the C one:
|
||||
* we enter with 0(%esp) == return address
|
||||
* 4(%esp) == *signal_pending
|
||||
* 8(%esp) == syscall number
|
||||
* 12(%esp) ... 32(%esp) == syscall arguments
|
||||
* and return the result in eax
|
||||
* and the syscall instruction needs
|
||||
* eax == syscall number
|
||||
* ebx, ecx, edx, esi, edi, ebp == syscall arguments
|
||||
* and returns the result in eax
|
||||
* Shuffle everything around appropriately.
|
||||
* Note the 16 bytes that we pushed to save registers.
|
||||
*/
|
||||
mov 12+16(%esp), %ebx /* the syscall arguments */
|
||||
mov 16+16(%esp), %ecx
|
||||
mov 20+16(%esp), %edx
|
||||
mov 24+16(%esp), %esi
|
||||
mov 28+16(%esp), %edi
|
||||
mov 32+16(%esp), %ebp
|
||||
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
safe_syscall_start:
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
mov 4+16(%esp), %eax /* signal_pending */
|
||||
cmpl $0, (%eax)
|
||||
jnz 1f
|
||||
mov 8+16(%esp), %eax /* syscall number */
|
||||
int $0x80
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
mov 4+16(%esp), %eax /* signal_pending */
|
||||
cmpl $0, (%eax)
|
||||
jnz 1f
|
||||
mov 8+16(%esp), %eax /* syscall number */
|
||||
int $0x80
|
||||
safe_syscall_end:
|
||||
/* code path for having successfully executed the syscall */
|
||||
pop %ebx
|
||||
.cfi_remember_state
|
||||
.cfi_adjust_cfa_offset -4
|
||||
.cfi_restore ebx
|
||||
pop %edi
|
||||
.cfi_adjust_cfa_offset -4
|
||||
.cfi_restore edi
|
||||
pop %esi
|
||||
.cfi_adjust_cfa_offset -4
|
||||
.cfi_restore esi
|
||||
pop %ebp
|
||||
.cfi_adjust_cfa_offset -4
|
||||
.cfi_restore ebp
|
||||
ret
|
||||
/* code path for having successfully executed the syscall */
|
||||
pop %ebx
|
||||
.cfi_remember_state
|
||||
.cfi_adjust_cfa_offset -4
|
||||
.cfi_restore ebx
|
||||
pop %edi
|
||||
.cfi_adjust_cfa_offset -4
|
||||
.cfi_restore edi
|
||||
pop %esi
|
||||
.cfi_adjust_cfa_offset -4
|
||||
.cfi_restore esi
|
||||
pop %ebp
|
||||
.cfi_adjust_cfa_offset -4
|
||||
.cfi_restore ebp
|
||||
ret
|
||||
|
||||
1:
|
||||
/* code path when we didn't execute the syscall */
|
||||
.cfi_restore_state
|
||||
mov $-TARGET_ERESTARTSYS, %eax
|
||||
jmp safe_syscall_end
|
||||
.cfi_endproc
|
||||
/* code path when we didn't execute the syscall */
|
||||
.cfi_restore_state
|
||||
mov $-TARGET_ERESTARTSYS, %eax
|
||||
jmp safe_syscall_end
|
||||
.cfi_endproc
|
||||
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
|
||||
@ -10,87 +10,87 @@
|
||||
* See the COPYING file in the top-level directory.
|
||||
*/
|
||||
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, @function
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, @function
|
||||
|
||||
.text
|
||||
.text
|
||||
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
#if _CALL_ELF == 2
|
||||
safe_syscall_base:
|
||||
.cfi_startproc
|
||||
.localentry safe_syscall_base,0
|
||||
.cfi_startproc
|
||||
.localentry safe_syscall_base,0
|
||||
#else
|
||||
.section ".opd","aw"
|
||||
.align 3
|
||||
.section ".opd","aw"
|
||||
.align 3
|
||||
safe_syscall_base:
|
||||
.quad .L.safe_syscall_base,.TOC.@tocbase,0
|
||||
.previous
|
||||
.quad .L.safe_syscall_base,.TOC.@tocbase,0
|
||||
.previous
|
||||
.L.safe_syscall_base:
|
||||
.cfi_startproc
|
||||
.cfi_startproc
|
||||
#endif
|
||||
/* We enter with r3 == *signal_pending
|
||||
* r4 == syscall number
|
||||
* r5 ... r10 == syscall arguments
|
||||
* and return the result in r3
|
||||
* and the syscall instruction needs
|
||||
* r0 == syscall number
|
||||
* r3 ... r8 == syscall arguments
|
||||
* and returns the result in r3
|
||||
* Shuffle everything around appropriately.
|
||||
*/
|
||||
std 14, 16(1) /* Preserve r14 in SP+16 */
|
||||
.cfi_offset 14, 16
|
||||
mr 14, 3 /* signal_pending */
|
||||
mr 0, 4 /* syscall number */
|
||||
mr 3, 5 /* syscall arguments */
|
||||
mr 4, 6
|
||||
mr 5, 7
|
||||
mr 6, 8
|
||||
mr 7, 9
|
||||
mr 8, 10
|
||||
/* We enter with r3 == *signal_pending
|
||||
* r4 == syscall number
|
||||
* r5 ... r10 == syscall arguments
|
||||
* and return the result in r3
|
||||
* and the syscall instruction needs
|
||||
* r0 == syscall number
|
||||
* r3 ... r8 == syscall arguments
|
||||
* and returns the result in r3
|
||||
* Shuffle everything around appropriately.
|
||||
*/
|
||||
std 14, 16(1) /* Preserve r14 in SP+16 */
|
||||
.cfi_offset 14, 16
|
||||
mr 14, 3 /* signal_pending */
|
||||
mr 0, 4 /* syscall number */
|
||||
mr 3, 5 /* syscall arguments */
|
||||
mr 4, 6
|
||||
mr 5, 7
|
||||
mr 6, 8
|
||||
mr 7, 9
|
||||
mr 8, 10
|
||||
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
safe_syscall_start:
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
lwz 12, 0(14)
|
||||
cmpwi 0, 12, 0
|
||||
bne- 0f
|
||||
sc
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
lwz 12, 0(14)
|
||||
cmpwi 0, 12, 0
|
||||
bne- 0f
|
||||
sc
|
||||
safe_syscall_end:
|
||||
/* code path when we did execute the syscall */
|
||||
ld 14, 16(1) /* restore r14 to its original value */
|
||||
bnslr+
|
||||
/* code path when we did execute the syscall */
|
||||
ld 14, 16(1) /* restore r14 to its original value */
|
||||
bnslr+
|
||||
|
||||
/* syscall failed; return negative errno */
|
||||
neg 3, 3
|
||||
blr
|
||||
/* syscall failed; return negative errno */
|
||||
neg 3, 3
|
||||
blr
|
||||
|
||||
/* code path when we didn't execute the syscall */
|
||||
0: addi 3, 0, -TARGET_ERESTARTSYS
|
||||
ld 14, 16(1) /* restore r14 to its original value */
|
||||
blr
|
||||
.cfi_endproc
|
||||
/* code path when we didn't execute the syscall */
|
||||
0: addi 3, 0, -TARGET_ERESTARTSYS
|
||||
ld 14, 16(1) /* restore r14 to its original value */
|
||||
blr
|
||||
.cfi_endproc
|
||||
|
||||
#if _CALL_ELF == 2
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
#else
|
||||
.size safe_syscall_base, .-.L.safe_syscall_base
|
||||
.size .L.safe_syscall_base, .-.L.safe_syscall_base
|
||||
.size safe_syscall_base, .-.L.safe_syscall_base
|
||||
.size .L.safe_syscall_base, .-.L.safe_syscall_base
|
||||
#endif
|
||||
|
||||
@ -10,68 +10,68 @@
|
||||
* See the COPYING file in the top-level directory.
|
||||
*/
|
||||
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, @function
|
||||
.type safe_syscall_start, @function
|
||||
.type safe_syscall_end, @function
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, @function
|
||||
.type safe_syscall_start, @function
|
||||
.type safe_syscall_end, @function
|
||||
|
||||
/*
|
||||
* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
/*
|
||||
* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
safe_syscall_base:
|
||||
.cfi_startproc
|
||||
/*
|
||||
* The syscall calling convention is nearly the same as C:
|
||||
* we enter with a0 == *signal_pending
|
||||
* a1 == syscall number
|
||||
* a2 ... a7 == syscall arguments
|
||||
* and return the result in a0
|
||||
* and the syscall instruction needs
|
||||
* a7 == syscall number
|
||||
* a0 ... a5 == syscall arguments
|
||||
* and returns the result in a0
|
||||
* Shuffle everything around appropriately.
|
||||
*/
|
||||
mv t0, a0 /* signal_pending pointer */
|
||||
mv t1, a1 /* syscall number */
|
||||
mv a0, a2 /* syscall arguments */
|
||||
mv a1, a3
|
||||
mv a2, a4
|
||||
mv a3, a5
|
||||
mv a4, a6
|
||||
mv a5, a7
|
||||
mv a7, t1
|
||||
.cfi_startproc
|
||||
/*
|
||||
* The syscall calling convention is nearly the same as C:
|
||||
* we enter with a0 == *signal_pending
|
||||
* a1 == syscall number
|
||||
* a2 ... a7 == syscall arguments
|
||||
* and return the result in a0
|
||||
* and the syscall instruction needs
|
||||
* a7 == syscall number
|
||||
* a0 ... a5 == syscall arguments
|
||||
* and returns the result in a0
|
||||
* Shuffle everything around appropriately.
|
||||
*/
|
||||
mv t0, a0 /* signal_pending pointer */
|
||||
mv t1, a1 /* syscall number */
|
||||
mv a0, a2 /* syscall arguments */
|
||||
mv a1, a3
|
||||
mv a2, a4
|
||||
mv a3, a5
|
||||
mv a4, a6
|
||||
mv a5, a7
|
||||
mv a7, t1
|
||||
|
||||
/*
|
||||
* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
/*
|
||||
* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
safe_syscall_start:
|
||||
/* If signal_pending is non-zero, don't do the call */
|
||||
lw t1, 0(t0)
|
||||
bnez t1, 0f
|
||||
scall
|
||||
/* If signal_pending is non-zero, don't do the call */
|
||||
lw t1, 0(t0)
|
||||
bnez t1, 0f
|
||||
scall
|
||||
safe_syscall_end:
|
||||
/* code path for having successfully executed the syscall */
|
||||
ret
|
||||
/* code path for having successfully executed the syscall */
|
||||
ret
|
||||
|
||||
0:
|
||||
/* code path when we didn't execute the syscall */
|
||||
li a0, -TARGET_ERESTARTSYS
|
||||
ret
|
||||
.cfi_endproc
|
||||
/* code path when we didn't execute the syscall */
|
||||
li a0, -TARGET_ERESTARTSYS
|
||||
ret
|
||||
.cfi_endproc
|
||||
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
|
||||
@ -10,81 +10,81 @@
|
||||
* See the COPYING file in the top-level directory.
|
||||
*/
|
||||
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, @function
|
||||
.global safe_syscall_base
|
||||
.global safe_syscall_start
|
||||
.global safe_syscall_end
|
||||
.type safe_syscall_base, @function
|
||||
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
/* This is the entry point for making a system call. The calling
|
||||
* convention here is that of a C varargs function with the
|
||||
* first argument an 'int *' to the signal_pending flag, the
|
||||
* second one the system call number (as a 'long'), and all further
|
||||
* arguments being syscall arguments (also 'long').
|
||||
* We return a long which is the syscall's return value, which
|
||||
* may be negative-errno on failure. Conversion to the
|
||||
* -1-and-errno-set convention is done by the calling wrapper.
|
||||
*/
|
||||
safe_syscall_base:
|
||||
.cfi_startproc
|
||||
stmg %r6,%r15,48(%r15) /* save all call-saved registers */
|
||||
.cfi_offset %r15,-40
|
||||
.cfi_offset %r14,-48
|
||||
.cfi_offset %r13,-56
|
||||
.cfi_offset %r12,-64
|
||||
.cfi_offset %r11,-72
|
||||
.cfi_offset %r10,-80
|
||||
.cfi_offset %r9,-88
|
||||
.cfi_offset %r8,-96
|
||||
.cfi_offset %r7,-104
|
||||
.cfi_offset %r6,-112
|
||||
lgr %r1,%r15
|
||||
lg %r0,8(%r15) /* load eos */
|
||||
aghi %r15,-160
|
||||
.cfi_adjust_cfa_offset 160
|
||||
stg %r1,0(%r15) /* store back chain */
|
||||
stg %r0,8(%r15) /* store eos */
|
||||
.cfi_startproc
|
||||
stmg %r6,%r15,48(%r15) /* save all call-saved registers */
|
||||
.cfi_offset %r15,-40
|
||||
.cfi_offset %r14,-48
|
||||
.cfi_offset %r13,-56
|
||||
.cfi_offset %r12,-64
|
||||
.cfi_offset %r11,-72
|
||||
.cfi_offset %r10,-80
|
||||
.cfi_offset %r9,-88
|
||||
.cfi_offset %r8,-96
|
||||
.cfi_offset %r7,-104
|
||||
.cfi_offset %r6,-112
|
||||
lgr %r1,%r15
|
||||
lg %r0,8(%r15) /* load eos */
|
||||
aghi %r15,-160
|
||||
.cfi_adjust_cfa_offset 160
|
||||
stg %r1,0(%r15) /* store back chain */
|
||||
stg %r0,8(%r15) /* store eos */
|
||||
|
||||
/* The syscall calling convention isn't the same as the
|
||||
* C one:
|
||||
* we enter with r2 == *signal_pending
|
||||
* r3 == syscall number
|
||||
* r4, r5, r6, (stack) == syscall arguments
|
||||
* and return the result in r2
|
||||
* and the syscall instruction needs
|
||||
* r1 == syscall number
|
||||
* r2 ... r7 == syscall arguments
|
||||
* and returns the result in r2
|
||||
* Shuffle everything around appropriately.
|
||||
*/
|
||||
lgr %r8,%r2 /* signal_pending pointer */
|
||||
lgr %r1,%r3 /* syscall number */
|
||||
lgr %r2,%r4 /* syscall args */
|
||||
lgr %r3,%r5
|
||||
lgr %r4,%r6
|
||||
lmg %r5,%r7,320(%r15)
|
||||
/* The syscall calling convention isn't the same as the
|
||||
* C one:
|
||||
* we enter with r2 == *signal_pending
|
||||
* r3 == syscall number
|
||||
* r4, r5, r6, (stack) == syscall arguments
|
||||
* and return the result in r2
|
||||
* and the syscall instruction needs
|
||||
* r1 == syscall number
|
||||
* r2 ... r7 == syscall arguments
|
||||
* and returns the result in r2
|
||||
* Shuffle everything around appropriately.
|
||||
*/
|
||||
lgr %r8,%r2 /* signal_pending pointer */
|
||||
lgr %r1,%r3 /* syscall number */
|
||||
lgr %r2,%r4 /* syscall args */
|
||||
lgr %r3,%r5
|
||||
lgr %r4,%r6
|
||||
lmg %r5,%r7,320(%r15)
|
||||
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
/* This next sequence of code works in conjunction with the
|
||||
* rewind_if_safe_syscall_function(). If a signal is taken
|
||||
* and the interrupted PC is anywhere between 'safe_syscall_start'
|
||||
* and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'.
|
||||
* The code sequence must therefore be able to cope with this, and
|
||||
* the syscall instruction must be the final one in the sequence.
|
||||
*/
|
||||
safe_syscall_start:
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
icm %r0,15,0(%r8)
|
||||
jne 2f
|
||||
svc 0
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
icm %r0,15,0(%r8)
|
||||
jne 2f
|
||||
svc 0
|
||||
safe_syscall_end:
|
||||
|
||||
1: lg %r15,0(%r15) /* load back chain */
|
||||
.cfi_remember_state
|
||||
.cfi_adjust_cfa_offset -160
|
||||
lmg %r6,%r15,48(%r15) /* load saved registers */
|
||||
br %r14
|
||||
.cfi_restore_state
|
||||
2: lghi %r2, -TARGET_ERESTARTSYS
|
||||
j 1b
|
||||
.cfi_endproc
|
||||
1: lg %r15,0(%r15) /* load back chain */
|
||||
.cfi_remember_state
|
||||
.cfi_adjust_cfa_offset -160
|
||||
lmg %r6,%r15,48(%r15) /* load saved registers */
|
||||
br %r14
|
||||
.cfi_restore_state
|
||||
2: lghi %r2, -TARGET_ERESTARTSYS
|
||||
j 1b
|
||||
.cfi_endproc
|
||||
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
.size safe_syscall_base, .-safe_syscall_base
|
||||
|
||||
@ -67,7 +67,7 @@ safe_syscall_base:
|
||||
*/
|
||||
safe_syscall_start:
|
||||
/* if signal_pending is non-zero, don't do the call */
|
||||
cmpl $0, (%rbp)
|
||||
cmpl $0, (%rbp)
|
||||
jnz 1f
|
||||
syscall
|
||||
safe_syscall_end:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user