https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 90a8a73c06cc32b609a880d48449d7083327e11a authored by Linus Torvalds on 21 December 2010, 19:26:40 UTC
Linux 2.6.37-rc7
Linux 2.6.37-rc7
Tip revision: 90a8a73
rwsem_64.S
/*
* x86-64 rwsem wrappers
*
* This interfaces the inline asm code to the slow-path
* C routines. We need to save the call-clobbered regs
* that the asm does not mark as clobbered, and move the
* argument from %rax to %rdi.
*
* NOTE! We don't need to save %rax, because the functions
* will always return the semaphore pointer in %rax (which
* is also the input argument to these helpers)
*
* The following can clobber %rdx because the asm clobbers it:
* call_rwsem_down_write_failed
* call_rwsem_wake
* but %rdi, %rsi, %rcx, %r8-r11 always need saving.
*/
#include <linux/linkage.h>
#include <asm/rwlock.h>
#include <asm/alternative-asm.h>
#include <asm/frame.h>
#include <asm/dwarf2.h>
#define save_common_regs \
pushq %rdi; \
pushq %rsi; \
pushq %rcx; \
pushq %r8; \
pushq %r9; \
pushq %r10; \
pushq %r11
#define restore_common_regs \
popq %r11; \
popq %r10; \
popq %r9; \
popq %r8; \
popq %rcx; \
popq %rsi; \
popq %rdi
/* Fix up special calling conventions */
ENTRY(call_rwsem_down_read_failed)
save_common_regs
pushq %rdx
movq %rax,%rdi
call rwsem_down_read_failed
popq %rdx
restore_common_regs
ret
ENDPROC(call_rwsem_down_read_failed)
ENTRY(call_rwsem_down_write_failed)
save_common_regs
movq %rax,%rdi
call rwsem_down_write_failed
restore_common_regs
ret
ENDPROC(call_rwsem_down_write_failed)
ENTRY(call_rwsem_wake)
decl %edx /* do nothing if still outstanding active readers */
jnz 1f
save_common_regs
movq %rax,%rdi
call rwsem_wake
restore_common_regs
1: ret
ENDPROC(call_rwsem_wake)
/* Fix up special calling conventions */
ENTRY(call_rwsem_downgrade_wake)
save_common_regs
pushq %rdx
movq %rax,%rdi
call rwsem_downgrade_wake
popq %rdx
restore_common_regs
ret
ENDPROC(call_rwsem_downgrade_wake)