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libc/mcount: compatible with armv6m mcount implementation

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mcount.S: Assembler messages:
mcount.S:33: Error: cannot honor width suffix -- `bic r1,lr,#1'
mcount.S:35: Error: cannot honor width suffix -- `bic r0,r0,#1'
mcount.S:37: Error: cannot honor width suffix -- `pop {r0,r1,r2,r3,ip,lr}

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>
This commit is contained in:
yinshengkai
2025-07-10 14:39:45 +08:00
committed by Xiang Xiao
parent e1e9ea2e81
commit 156ef05205
1 changed files with 8 additions and 7 deletions
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15
libs/libc/machine/arm/arch_mcount.S
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@@ -29,13 +29,14 @@
.type __gnu_mcount_nc, %function
__gnu_mcount_nc:
push {r0, r1, r2, r3, lr} /* Save registers */
bic r1, lr, #1 /* R1 contains callee address, with thumb bit cleared */
ldr r0, [sp, #20] /* R0 contains caller address */
bic r0, r0, #1 /* Clear thumb bit */
bl mcount_internal /* Jump to internal _mcount() implementation */
pop {r0, r1, r2, r3, ip, lr} /* Restore saved registers */
bx ip /* Return to callee */
push {r0, r1, r2, r3, lr} /* Save registers */
mov r1, lr
bic r1, r1, #1 /* R1 contains callee address, with thumb bit cleared */
ldr r0, [sp, #20] /* R0 contains caller address */
bic r0, r0, #1 /* Clear thumb bit */
bl mcount_internal /* Jump to internal _mcount() implementation */
pop {r0, r1, r2, r3, ip, lr} /* Restore saved registers */
bx ip /* Return to callee */
.size __gnu_mcount_nc, .-__gnu_mcount_nc
.end