diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2000-02-05 06:47:02 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2000-02-05 06:47:02 +0000 |
| commit | 99a7e12f34b3661a0d1354eef83a0eef4df5e34c (patch) | |
| tree | 3560aca9ca86792f9ab7bd87861ea143a1b3c7a3 /arch/sparc/lib/rwsem.S | |
| parent | e73a04659c0b8cdee4dd40e58630e2cf63afb316 (diff) | |
Merge with Linux 2.3.38.
Diffstat (limited to 'arch/sparc/lib/rwsem.S')
| -rw-r--r-- | arch/sparc/lib/rwsem.S | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/arch/sparc/lib/rwsem.S b/arch/sparc/lib/rwsem.S new file mode 100644 index 000000000..0d5f74139 --- /dev/null +++ b/arch/sparc/lib/rwsem.S @@ -0,0 +1,191 @@ +/* $Id: rwsem.S,v 1.2 2000/01/05 01:00:38 davem Exp $ + * Assembly part of rw semaphores. + * + * Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com) + */ + +#include <asm/ptrace.h> +#include <asm/psr.h> + + .text + .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 __SMP__ +1: ldstub [%g1 + 4], %g7 + tst %g7 + bne 1b + ld [%g1], %g7 + subcc %g7, 1, %g7 + st %g7, [%g1] + stb %g0, [%g1 + 4] +#else + ld [%g1], %g7 + subcc %g7, 1, %g7 + st %g7, [%g1] +#endif + wr %g3, 0, %psr + nop + 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 __SMP__ +1: ldstub [%g1 + 4], %g7 + tst %g7 + bne 1b + ld [%g1], %g7 + subcc %g7, %g2, %g7 + st %g7, [%g1] + stb %g0, [%g1 + 4] +#else + ld [%g1], %g7 + subcc %g7, %g2, %g7 + st %g7, [%g1] +#endif + wr %g3, 0, %psr + nop + 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 + + .globl ___up_read +___up_read: + rd %psr, %g3 + nop + nop + nop + or %g3, PSR_PIL, %g7 + wr %g7, 0, %psr + nop + nop + nop +#ifdef __SMP__ +1: ldstub [%g1 + 4], %g7 + tst %g7 + bne 1b + ld [%g1], %g7 + addcc %g7, 1, %g7 + st %g7, [%g1] + stb %g0, [%g1 + 4] +#else + ld [%g1], %g7 + addcc %g7, 1, %g7 + st %g7, [%g1] +#endif + wr %g3, 0, %psr + nop + 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 __SMP__ +1: ldstub [%g1 + 4], %g7 + tst %g7 + bne 1b + ld [%g1], %g7 + addcc %g7, %g2, %g7 + st %g7, [%g1] + stb %g0, [%g1 + 4] +#else + ld [%g1], %g7 + addcc %g7, %g2, %g7 + st %g7, [%g1] +#endif + wr %g3, 0, %psr + nop + 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 |