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arm64 fork: FORK_REG_LR,FORK_REG_SP should save the func local stack #13664

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Sep 29, 2024
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arm64 fork: FORK_REG_LR,FORK_REG_SP should save the func local stack #13664

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12 changes: 6 additions & 6 deletions arch/arm64/src/common/arm64_fork_func.S
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Original file line number Diff line number Diff line change
Expand Up @@ -86,9 +86,8 @@ GTEXT(up_fork)
SECTION_FUNC(text, up_fork)
/* Create a stack frame */

mov x0, sp /* Save the value of the stack on entry */
stp x29, x30, [sp]
sub sp, sp, #8 * FORK_REGS_SIZE /* Allocate the structure on the stack */
stp x29, x30, [sp, #8 * FORK_REG_FP] /* Save the FP, LR */

/* CPU registers, save all register*/

Expand All @@ -106,11 +105,12 @@ SECTION_FUNC(text, up_fork)
stp x22, x23, [sp, #8 * FORK_REG_X22]
stp x24, x25, [sp, #8 * FORK_REG_X24]
stp x26, x27, [sp, #8 * FORK_REG_X26]
stp x28, x29, [sp, #8 * FORK_REG_X28]
str x28, [sp, #8 * FORK_REG_X28]

/* Save the LR, stack pointer */
/* Save the stack pointer */

stp x30, x0, [sp, #8 * FORK_REG_LR]
add x0, sp, #8 * FORK_REGS_SIZE
str x0, [sp, #8 * FORK_REG_SP]

/* Floating point registers */
#ifdef CONFIG_ARCH_FPU
Expand All @@ -128,7 +128,7 @@ SECTION_FUNC(text, up_fork)

/* Release the stack data and return the value returned by arm64_fork */

ldp x29, x30, [sp, #8 * FORK_REG_FP]
add sp, sp, #8 * FORK_REGS_SIZE
ldp x29, x30, [sp]

ret
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