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arm_smcc_1_2_*: Don't trash SP and X19 if no return value structure.

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Jumping direct to ret was not restoring the saved value of x19 and was
also not adjusting sp to discard the two saved registers.

Reviewed by:	andrew
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D37922
This commit is contained in:
John Baldwin 2023-02-01 13:54:09 -08:00
parent a0102dee34
commit 6cc52efa13
1 changed files with 2 additions and 2 deletions
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4
sys/dev/psci/smccc_arm64.S
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@ -77,8 +77,8 @@ ENTRY(arm_smccc_1_2_\insn)
stp x12, x13, [x19, #16 * 6]
stp x14, x15, [x19, #16 * 7]
stp x16, x17, [x19, #16 * 8]
ldp xzr, x19, [sp], #16
1: ret
1: ldp xzr, x19, [sp], #16
ret
END(arm_smccc_1_2\insn)
.endm
/* int arm_smccc_1_2_*(const struct arm_smccc_1_2_regs *args,