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libc/mcount: add armv6m mcount implementation #16675

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Merged
xiaoxiang781216 merged 1 commit into from
Jul 10, 2025
Merged

libc/mcount: add armv6m mcount implementation #16675

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15 changes: 8 additions & 7 deletions libs/libc/machine/arm/arch_mcount.S
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Original file line number Diff line number Diff line change
Expand Up @@ -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
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