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| author | Szabolcs Nagy <nsz@port70.net> | 2017-02-21 00:07:34 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2017-06-22 18:34:06 -0400 |
| commit | e6def544358afd5648a428d2e02c147a1f901048 (patch) | |
| tree | 9210513645e1a5dc230e1f128237dbe978e94ee7 /src/string/arm/__aeabi_memcpy.s | |
| parent | 91d34c4533e6bf6eacad7a9f001f28f9e5ebc656 (diff) | |
| download | musl-e6def544358afd5648a428d2e02c147a1f901048.tar.gz | |
fix arm run-time abi string functions
in arm rtabi these __aeabi_* functions have special abi (they are
only allowed to clobber r0,r1,r2,r3,ip,lr,cpsr), so they cannot
be simple wrappers around normal string functions (which may
clobber other registers), the safest solution is to write them in
asm, a minimalistic implementation works because these are not
supposed to be emitted by compilers or used in general.
Diffstat (limited to 'src/string/arm/__aeabi_memcpy.s')
| -rw-r--r-- | src/string/arm/__aeabi_memcpy.s | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/string/arm/__aeabi_memcpy.s b/src/string/arm/__aeabi_memcpy.s new file mode 100644 index 00000000..3a527e41 --- /dev/null +++ b/src/string/arm/__aeabi_memcpy.s @@ -0,0 +1,45 @@ +.syntax unified + +.global __aeabi_memcpy8 +.global __aeabi_memcpy4 +.global __aeabi_memcpy +.global __aeabi_memmove8 +.global __aeabi_memmove4 +.global __aeabi_memmove + +.type __aeabi_memcpy8,%function +.type __aeabi_memcpy4,%function +.type __aeabi_memcpy,%function +.type __aeabi_memmove8,%function +.type __aeabi_memmove4,%function +.type __aeabi_memmove,%function + +__aeabi_memmove8: +__aeabi_memmove4: +__aeabi_memmove: + cmp r0, r1 + bls 3f + cmp r2, #0 + beq 2f + adds r0, r0, r2 + adds r2, r1, r2 +1: subs r2, r2, #1 + ldrb r3, [r2] + subs r0, r0, #1 + strb r3, [r0] + cmp r1, r2 + bne 1b +2: bx lr +__aeabi_memcpy8: +__aeabi_memcpy4: +__aeabi_memcpy: +3: cmp r2, #0 + beq 2f + adds r2, r1, r2 +1: ldrb r3, [r1] + adds r1, r1, #1 + strb r3, [r0] + adds r0, r0, #1 + cmp r1, r2 + bne 1b +2: bx lr |