diff options
Diffstat (limited to 'libexec/rtld-elf/alpha/rtld_start.S')
| -rw-r--r-- | libexec/rtld-elf/alpha/rtld_start.S | 53 |
1 files changed, 50 insertions, 3 deletions
diff --git a/libexec/rtld-elf/alpha/rtld_start.S b/libexec/rtld-elf/alpha/rtld_start.S index d7ec0d3..29d6178 100644 --- a/libexec/rtld-elf/alpha/rtld_start.S +++ b/libexec/rtld-elf/alpha/rtld_start.S @@ -3,6 +3,7 @@ /* * Copyright 1996 Matt Thomas <matt@3am-software.com> + * Copyright 2000 John D. Polstra * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -165,7 +166,53 @@ $100: ldgp gp, 0(gp) lda sp, 168(sp) jmp $31, ($27) .end _rtld_bind_start - - - +/* + * int cmp0_and_store_int(volatile int *p, int newval); + * + * If an int holds 0, store newval into it; else do nothing. Returns + * the previous value. + */ +LEAF(cmp0_and_store_int, 2) +1: mov a1, t0 + ldl_l v0, 0(a0) + bne v0, 3f + stl_c t0, 0(a0) + beq t0, 2f + mb + RET +2: br 1b +3: RET +END(cmp0_and_store_int) + +LEAF(atomic_add_int, 2) +0: ldl_l t0, 0(a0) + addq t0, a1, t0 + stl_c t0, 0(a0) + beq t0, 1f + mb + RET +1: br 0b +END(atomic_add_int) + +/* Atomically increment an int. */ +LEAF(atomic_incr_int, 1) +0: ldl_l t0, 0(a0) + addq t0, 1, t0 + stl_c t0, 0(a0) + beq t0, 1f + mb + RET +1: br 0b +END(atomic_incr_int) + +/* Atomically decrement an int. */ +LEAF(atomic_decr_int, 1) +0: ldl_l t0, 0(a0) + subq t0, 1, t0 + stl_c t0, 0(a0) + beq t0, 1f + mb + RET +1: br 0b +END(atomic_decr_int) |
