linux/arch/sparc/lib/rwsem_32.S

/*
 * Assembly part of rw semaphores.
 *
 * Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com)
 */

#include <asm/ptrace.h>
#include <asm/psr.h>

	.section .sched.text, "ax"
	.align	4

	.globl		___down_read
___down_read:
	rd		%psr, %g3
	nop
	nop
	nop
	or		%g3, PSR_PIL, %g7
	wr		%g7, 0, %psr
	nop
	nop
	nop
#ifdef CONFIG_SMP
1:	ldstub		[%g1 + 4], %g7
	tst		%g7
	bne		1b
	 ld		[%g1], %g7
	sub		%g7, 1, %g7
	st		%g7, [%g1]
	stb		%g0, [%g1 + 4]
#else
	ld		[%g1], %g7
	sub		%g7, 1, %g7
	st		%g7, [%g1]
#endif
	wr		%g3, 0, %psr
	add		%g7, 1, %g7
	nop
	nop
	subcc		%g7, 1, %g7
	bneg		3f
	 nop
2:	jmpl		%o7, %g0
	 mov		%g4, %o7
3:	save		%sp, -64, %sp
	mov		%g1, %l1
	mov		%g4, %l4
	bcs		4f
	 mov		%g5, %l5
	call		down_read_failed
	 mov		%l1, %o0
	mov		%l1, %g1
	mov		%l4, %g4
	ba		___down_read
	 restore	%l5, %g0, %g5
4:	call		down_read_failed_biased
	 mov		%l1, %o0
	mov		%l1, %g1
	mov		%l4, %g4
	ba		2b
	 restore	%l5, %g0, %g5

	.globl		___down_write
___down_write:
	rd		%psr, %g3
	nop
	nop
	nop
	or		%g3, PSR_PIL, %g7
	wr		%g7, 0, %psr
	sethi		%hi(0x01000000), %g2
	nop
	nop
#ifdef CONFIG_SMP
1:	ldstub		[%g1 + 4], %g7
	tst		%g7
	bne		1b
	 ld		[%g1], %g7
	sub		%g7, %g2, %g7
	st		%g7, [%g1]
	stb		%g0, [%g1 + 4]
#else
	ld		[%g1], %g7
	sub		%g7, %g2, %g7
	st		%g7, [%g1]
#endif
	wr		%g3, 0, %psr
	add		%g7, %g2, %g7
	nop
	nop
	subcc		%g7, %g2, %g7
	bne		3f
	 nop
2:	jmpl		%o7, %g0
	 mov		%g4, %o7
3:	save		%sp, -64, %sp
	mov		%g1, %l1
	mov		%g4, %l4
	bcs		4f
	 mov		%g5, %l5
	call		down_write_failed
	 mov		%l1, %o0
	mov		%l1, %g1
	mov		%l4, %g4
	ba		___down_write
	 restore	%l5, %g0, %g5
4:	call		down_write_failed_biased
	 mov		%l1, %o0
	mov		%l1, %g1
	mov		%l4, %g4
	ba		2b
	 restore	%l5, %g0, %g5

	.text
	.globl		___up_read
___up_read:
	rd		%psr, %g3
	nop
	nop
	nop
	or		%g3, PSR_PIL, %g7
	wr		%g7, 0, %psr
	nop
	nop
	nop
#ifdef CONFIG_SMP
1:	ldstub		[%g1 + 4], %g7
	tst		%g7
	bne		1b
	 ld		[%g1], %g7
	add		%g7, 1, %g7
	st		%g7, [%g1]
	stb		%g0, [%g1 + 4]
#else
	ld		[%g1], %g7
	add		%g7, 1, %g7
	st		%g7, [%g1]
#endif
	wr		%g3, 0, %psr
	nop
	nop
	nop
	cmp		%g7, 0
	be		3f
	 nop
2:	jmpl		%o7, %g0
	 mov		%g4, %o7
3:	save		%sp, -64, %sp
	mov		%g1, %l1
	mov		%g4, %l4
	mov		%g5, %l5
	clr		%o1
	call		__rwsem_wake
	 mov		%l1, %o0
	mov		%l1, %g1
	mov		%l4, %g4
	ba		2b
	 restore	%l5, %g0, %g5

	.globl		___up_write
___up_write:
	rd		%psr, %g3
	nop
	nop
	nop
	or		%g3, PSR_PIL, %g7
	wr		%g7, 0, %psr
	sethi		%hi(0x01000000), %g2
	nop
	nop
#ifdef CONFIG_SMP
1:	ldstub		[%g1 + 4], %g7
	tst		%g7
	bne		1b
	 ld		[%g1], %g7
	add		%g7, %g2, %g7
	st		%g7, [%g1]
	stb		%g0, [%g1 + 4]
#else
	ld		[%g1], %g7
	add		%g7, %g2, %g7
	st		%g7, [%g1]
#endif
	wr		%g3, 0, %psr
	sub		%g7, %g2, %g7
	nop
	nop
	addcc		%g7, %g2, %g7
	bcs		3f
	 nop
2:	jmpl		%o7, %g0
	 mov		%g4, %o7
3:	save		%sp, -64, %sp
	mov		%g1, %l1
	mov		%g4, %l4
	mov		%g5, %l5
	mov		%g7, %o1
	call		__rwsem_wake
	 mov		%l1, %o0
	mov		%l1, %g1
	mov		%l4, %g4
	ba		2b
	 restore	%l5, %g0, %g5
sparc: remove CVS keywords This patch removes the CVS keywords that weren't updated for a long time from comments. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 2008-05-20 07:53:02 +08:00			`/*`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 06:20:36 +08:00			`* Assembly part of rw semaphores.`
			`*`
			`* Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com)`
			`*/`

			`#include <asm/ptrace.h>`
			`#include <asm/psr.h>`

[SPARC/SPARC64]: Fix usage of .section .sched.text in assembler code. ld will generate an unique named section when assembler do not use "ax" but gcc does. Add the missing annotation. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net> 2008-01-29 13:06:23 +08:00			`.section .sched.text, "ax"`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 06:20:36 +08:00			`.align 4`

			`.globl ___down_read`
			`___down_read:`
			`rd %psr, %g3`
			`nop`
			`nop`
			`nop`
			`or %g3, PSR_PIL, %g7`
			`wr %g7, 0, %psr`
			`nop`
			`nop`
			`nop`
			`#ifdef CONFIG_SMP`
			`1: ldstub [%g1 + 4], %g7`
			`tst %g7`
			`bne 1b`
			`ld [%g1], %g7`
			`sub %g7, 1, %g7`
			`st %g7, [%g1]`
			`stb %g0, [%g1 + 4]`
			`#else`
			`ld [%g1], %g7`
			`sub %g7, 1, %g7`
			`st %g7, [%g1]`
			`#endif`
			`wr %g3, 0, %psr`
			`add %g7, 1, %g7`
			`nop`
			`nop`
			`subcc %g7, 1, %g7`
			`bneg 3f`
			`nop`
			`2: jmpl %o7, %g0`
			`mov %g4, %o7`
			`3: save %sp, -64, %sp`
			`mov %g1, %l1`
			`mov %g4, %l4`
			`bcs 4f`
			`mov %g5, %l5`
			`call down_read_failed`
			`mov %l1, %o0`
			`mov %l1, %g1`
			`mov %l4, %g4`
			`ba ___down_read`
			`restore %l5, %g0, %g5`
			`4: call down_read_failed_biased`
			`mov %l1, %o0`
			`mov %l1, %g1`
			`mov %l4, %g4`
			`ba 2b`
			`restore %l5, %g0, %g5`

			`.globl ___down_write`
			`___down_write:`
			`rd %psr, %g3`
			`nop`
			`nop`
			`nop`
			`or %g3, PSR_PIL, %g7`
			`wr %g7, 0, %psr`
			`sethi %hi(0x01000000), %g2`
			`nop`
			`nop`
			`#ifdef CONFIG_SMP`
			`1: ldstub [%g1 + 4], %g7`
			`tst %g7`
			`bne 1b`
			`ld [%g1], %g7`
			`sub %g7, %g2, %g7`
			`st %g7, [%g1]`
			`stb %g0, [%g1 + 4]`
			`#else`
			`ld [%g1], %g7`
			`sub %g7, %g2, %g7`
			`st %g7, [%g1]`
			`#endif`
			`wr %g3, 0, %psr`
			`add %g7, %g2, %g7`
			`nop`
			`nop`
			`subcc %g7, %g2, %g7`
			`bne 3f`
			`nop`
			`2: jmpl %o7, %g0`
			`mov %g4, %o7`
			`3: save %sp, -64, %sp`
			`mov %g1, %l1`
			`mov %g4, %l4`
			`bcs 4f`
			`mov %g5, %l5`
			`call down_write_failed`
			`mov %l1, %o0`
			`mov %l1, %g1`
			`mov %l4, %g4`
			`ba ___down_write`
			`restore %l5, %g0, %g5`
			`4: call down_write_failed_biased`
			`mov %l1, %o0`
			`mov %l1, %g1`
			`mov %l4, %g4`
			`ba 2b`
			`restore %l5, %g0, %g5`

			`.text`
			`.globl ___up_read`
			`___up_read:`
			`rd %psr, %g3`
			`nop`
			`nop`
			`nop`
			`or %g3, PSR_PIL, %g7`
			`wr %g7, 0, %psr`
			`nop`
			`nop`
			`nop`
			`#ifdef CONFIG_SMP`
			`1: ldstub [%g1 + 4], %g7`
			`tst %g7`
			`bne 1b`
			`ld [%g1], %g7`
			`add %g7, 1, %g7`
			`st %g7, [%g1]`
			`stb %g0, [%g1 + 4]`
			`#else`
			`ld [%g1], %g7`
			`add %g7, 1, %g7`
			`st %g7, [%g1]`
			`#endif`
			`wr %g3, 0, %psr`
			`nop`
			`nop`
			`nop`
			`cmp %g7, 0`
			`be 3f`
			`nop`
			`2: jmpl %o7, %g0`
			`mov %g4, %o7`
			`3: save %sp, -64, %sp`
			`mov %g1, %l1`
			`mov %g4, %l4`
			`mov %g5, %l5`
			`clr %o1`
			`call __rwsem_wake`
			`mov %l1, %o0`
			`mov %l1, %g1`
			`mov %l4, %g4`
			`ba 2b`
			`restore %l5, %g0, %g5`

			`.globl ___up_write`
			`___up_write:`
			`rd %psr, %g3`
			`nop`
			`nop`
			`nop`
			`or %g3, PSR_PIL, %g7`
			`wr %g7, 0, %psr`
			`sethi %hi(0x01000000), %g2`
			`nop`
			`nop`
			`#ifdef CONFIG_SMP`
			`1: ldstub [%g1 + 4], %g7`
			`tst %g7`
			`bne 1b`
			`ld [%g1], %g7`
			`add %g7, %g2, %g7`
			`st %g7, [%g1]`
			`stb %g0, [%g1 + 4]`
			`#else`
			`ld [%g1], %g7`
			`add %g7, %g2, %g7`
			`st %g7, [%g1]`
			`#endif`
			`wr %g3, 0, %psr`
			`sub %g7, %g2, %g7`
			`nop`
			`nop`
			`addcc %g7, %g2, %g7`
			`bcs 3f`
			`nop`
			`2: jmpl %o7, %g0`
			`mov %g4, %o7`
			`3: save %sp, -64, %sp`
			`mov %g1, %l1`
			`mov %g4, %l4`
			`mov %g5, %l5`
			`mov %g7, %o1`
			`call __rwsem_wake`
			`mov %l1, %o0`
			`mov %l1, %g1`
			`mov %l4, %g4`
			`ba 2b`
			`restore %l5, %g0, %g5`