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riscv-v/fork.S: Fix clobbering of s0 in fork()

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Value of s0 (callee-saved) must be preserved through the call, use
a0 (caller-saved) to calculate the original SP instead.
This commit is contained in:
Ville Juven 2024-05-30 15:11:24 +03:00 committed by Xiang Xiao
parent 275ec7102c
commit c1f3245167
1 changed files with 2 additions and 2 deletions
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4
arch/risc-v/src/common/fork.S
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@ -117,8 +117,8 @@ up_fork:
REGSTORE s0, FORK_S0_OFFSET(sp)
#endif
addi s0, sp, FORK_SIZEOF
REGSTORE s0, FORK_SP_OFFSET(sp) /* original SP */
addi a0, sp, FORK_SIZEOF
REGSTORE a0, FORK_SP_OFFSET(sp) /* original SP */
REGSTORE x1, FORK_RA_OFFSET(sp) /* return address */
/* Floating point registers */