mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 17:51:43 +00:00
39f2205e1a
These weren't part of the initial commit of this code. Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: Alexander van Heukelum <heukelum@fastmail.fm> LKML-Reference: <4D6BCDFF02000078000341B0@vpn.id2.novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
94 lines
2.3 KiB
ArmAsm
94 lines
2.3 KiB
ArmAsm
/*
|
|
* 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_cfi %rdi; CFI_REL_OFFSET rdi, 0; \
|
|
pushq_cfi %rsi; CFI_REL_OFFSET rsi, 0; \
|
|
pushq_cfi %rcx; CFI_REL_OFFSET rcx, 0; \
|
|
pushq_cfi %r8; CFI_REL_OFFSET r8, 0; \
|
|
pushq_cfi %r9; CFI_REL_OFFSET r9, 0; \
|
|
pushq_cfi %r10; CFI_REL_OFFSET r10, 0; \
|
|
pushq_cfi %r11; CFI_REL_OFFSET r11, 0
|
|
|
|
#define restore_common_regs \
|
|
popq_cfi %r11; CFI_RESTORE r11; \
|
|
popq_cfi %r10; CFI_RESTORE r10; \
|
|
popq_cfi %r9; CFI_RESTORE r9; \
|
|
popq_cfi %r8; CFI_RESTORE r8; \
|
|
popq_cfi %rcx; CFI_RESTORE rcx; \
|
|
popq_cfi %rsi; CFI_RESTORE rsi; \
|
|
popq_cfi %rdi; CFI_RESTORE rdi
|
|
|
|
/* Fix up special calling conventions */
|
|
ENTRY(call_rwsem_down_read_failed)
|
|
CFI_STARTPROC
|
|
save_common_regs
|
|
pushq_cfi %rdx
|
|
CFI_REL_OFFSET rdx, 0
|
|
movq %rax,%rdi
|
|
call rwsem_down_read_failed
|
|
popq_cfi %rdx
|
|
CFI_RESTORE rdx
|
|
restore_common_regs
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(call_rwsem_down_read_failed)
|
|
|
|
ENTRY(call_rwsem_down_write_failed)
|
|
CFI_STARTPROC
|
|
save_common_regs
|
|
movq %rax,%rdi
|
|
call rwsem_down_write_failed
|
|
restore_common_regs
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(call_rwsem_down_write_failed)
|
|
|
|
ENTRY(call_rwsem_wake)
|
|
CFI_STARTPROC
|
|
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
|
|
CFI_ENDPROC
|
|
ENDPROC(call_rwsem_wake)
|
|
|
|
/* Fix up special calling conventions */
|
|
ENTRY(call_rwsem_downgrade_wake)
|
|
CFI_STARTPROC
|
|
save_common_regs
|
|
pushq_cfi %rdx
|
|
CFI_REL_OFFSET rdx, 0
|
|
movq %rax,%rdi
|
|
call rwsem_downgrade_wake
|
|
popq_cfi %rdx
|
|
CFI_RESTORE rdx
|
|
restore_common_regs
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(call_rwsem_downgrade_wake)
|