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1. Use correct alignment mask, -15 != ~15

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2. Make end of frames
This commit is contained in:
davidxu 2004-07-31 01:41:41 +00:00
parent 6bb53152ba
commit afc35161bc
1 changed files with 2 additions and 2 deletions
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4
lib/libc/amd64/gen/makecontext.c
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@ -65,7 +65,7 @@ __makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...)
/* Align the stack to 16 bytes. */
sp = (uint64_t *)(ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
sp = (uint64_t *)((uint64_t)sp & -15UL);
sp = (uint64_t *)((uint64_t)sp & ~15UL);
/* Allocate space for a maximum of 6 arguments on the stack. */
args = sp - 6;
@ -88,7 +88,7 @@ __makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...)
ucp->uc_mcontext.mc_rdi = (register_t)ucp;
ucp->uc_mcontext.mc_rsi = (register_t)start;
ucp->uc_mcontext.mc_rdx = (register_t)args;
ucp->uc_mcontext.mc_rbp = (register_t)sp;
ucp->uc_mcontext.mc_rbp = 0;
ucp->uc_mcontext.mc_rbx = (register_t)sp;
ucp->uc_mcontext.mc_rsp = (register_t)sp;
ucp->uc_mcontext.mc_rip = (register_t)makectx_wrapper;