1da177e4c3
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!
206 lines
2.9 KiB
ArmAsm
206 lines
2.9 KiB
ArmAsm
/* $Id: rwsem.S,v 1.5 2000/05/09 17:40:13 davem Exp $
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* Assembly part of rw semaphores.
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*
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* Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com)
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*/
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#include <linux/config.h>
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#include <asm/ptrace.h>
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#include <asm/psr.h>
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.section .sched.text
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.align 4
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.globl ___down_read
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___down_read:
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rd %psr, %g3
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nop
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nop
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nop
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or %g3, PSR_PIL, %g7
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wr %g7, 0, %psr
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nop
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nop
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nop
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#ifdef CONFIG_SMP
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1: ldstub [%g1 + 4], %g7
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tst %g7
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bne 1b
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ld [%g1], %g7
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sub %g7, 1, %g7
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st %g7, [%g1]
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stb %g0, [%g1 + 4]
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#else
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ld [%g1], %g7
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sub %g7, 1, %g7
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st %g7, [%g1]
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#endif
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wr %g3, 0, %psr
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add %g7, 1, %g7
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nop
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nop
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subcc %g7, 1, %g7
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bneg 3f
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nop
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2: jmpl %o7, %g0
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mov %g4, %o7
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3: save %sp, -64, %sp
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mov %g1, %l1
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mov %g4, %l4
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bcs 4f
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mov %g5, %l5
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call down_read_failed
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mov %l1, %o0
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mov %l1, %g1
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mov %l4, %g4
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ba ___down_read
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restore %l5, %g0, %g5
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4: call down_read_failed_biased
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mov %l1, %o0
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mov %l1, %g1
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mov %l4, %g4
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ba 2b
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restore %l5, %g0, %g5
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.globl ___down_write
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___down_write:
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rd %psr, %g3
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nop
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nop
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nop
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or %g3, PSR_PIL, %g7
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wr %g7, 0, %psr
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sethi %hi(0x01000000), %g2
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nop
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nop
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#ifdef CONFIG_SMP
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1: ldstub [%g1 + 4], %g7
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tst %g7
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bne 1b
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ld [%g1], %g7
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sub %g7, %g2, %g7
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st %g7, [%g1]
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stb %g0, [%g1 + 4]
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#else
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ld [%g1], %g7
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sub %g7, %g2, %g7
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st %g7, [%g1]
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#endif
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wr %g3, 0, %psr
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add %g7, %g2, %g7
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nop
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nop
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subcc %g7, %g2, %g7
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bne 3f
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nop
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2: jmpl %o7, %g0
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mov %g4, %o7
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3: save %sp, -64, %sp
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mov %g1, %l1
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mov %g4, %l4
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bcs 4f
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mov %g5, %l5
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call down_write_failed
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mov %l1, %o0
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mov %l1, %g1
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mov %l4, %g4
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ba ___down_write
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restore %l5, %g0, %g5
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4: call down_write_failed_biased
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mov %l1, %o0
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mov %l1, %g1
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mov %l4, %g4
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ba 2b
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restore %l5, %g0, %g5
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.text
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.globl ___up_read
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___up_read:
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rd %psr, %g3
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nop
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nop
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nop
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or %g3, PSR_PIL, %g7
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wr %g7, 0, %psr
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nop
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nop
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nop
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#ifdef CONFIG_SMP
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1: ldstub [%g1 + 4], %g7
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tst %g7
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bne 1b
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ld [%g1], %g7
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add %g7, 1, %g7
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st %g7, [%g1]
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stb %g0, [%g1 + 4]
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#else
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ld [%g1], %g7
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add %g7, 1, %g7
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st %g7, [%g1]
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#endif
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wr %g3, 0, %psr
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nop
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nop
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nop
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cmp %g7, 0
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be 3f
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nop
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2: jmpl %o7, %g0
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mov %g4, %o7
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3: save %sp, -64, %sp
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mov %g1, %l1
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mov %g4, %l4
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mov %g5, %l5
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clr %o1
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call __rwsem_wake
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mov %l1, %o0
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mov %l1, %g1
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mov %l4, %g4
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ba 2b
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restore %l5, %g0, %g5
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.globl ___up_write
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___up_write:
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rd %psr, %g3
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nop
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nop
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nop
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or %g3, PSR_PIL, %g7
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wr %g7, 0, %psr
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sethi %hi(0x01000000), %g2
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nop
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nop
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#ifdef CONFIG_SMP
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1: ldstub [%g1 + 4], %g7
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tst %g7
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bne 1b
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ld [%g1], %g7
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add %g7, %g2, %g7
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st %g7, [%g1]
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stb %g0, [%g1 + 4]
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#else
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ld [%g1], %g7
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add %g7, %g2, %g7
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st %g7, [%g1]
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#endif
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wr %g3, 0, %psr
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sub %g7, %g2, %g7
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nop
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nop
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addcc %g7, %g2, %g7
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bcs 3f
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nop
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2: jmpl %o7, %g0
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mov %g4, %o7
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3: save %sp, -64, %sp
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mov %g1, %l1
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mov %g4, %l4
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mov %g5, %l5
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mov %g7, %o1
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call __rwsem_wake
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mov %l1, %o0
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mov %l1, %g1
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mov %l4, %g4
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ba 2b
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restore %l5, %g0, %g5
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