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arm/vfork: update the SP to stack top

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Signed-off-by: chao.an <anchao@xiaomi.com>
This commit is contained in:
chao.an 2022-03-18 21:54:01 +08:00 committed by Masayuki Ishikawa
parent 9ae0dcd4a2
commit a770ff2017
1 changed files with 11 additions and 3 deletions
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14
arch/arm/src/common/arm_vfork.c
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@ -137,10 +137,18 @@ pid_t up_vfork(const struct vfork_s *context)
* effort is overkill.
*/
newtop = STACK_ALIGN_DOWN((uint32_t)child->cmn.stack_base_ptr +
child->cmn.adj_stack_size -
XCPTCONTEXT_SIZE);
newtop = (uint32_t)child->cmn.stack_base_ptr +
child->cmn.adj_stack_size;
newsp = newtop - stackutil;
/* Move the register context to newtop. */
memcpy((void *)(newsp - XCPTCONTEXT_SIZE),
child->cmn.xcp.regs, XCPTCONTEXT_SIZE);
child->cmn.xcp.regs = (void *)(newsp - XCPTCONTEXT_SIZE);
memcpy((void *)newsp, (const void *)context->sp, stackutil);
/* Was there a frame pointer in place before? */