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rt: Shave a few instructions off __morestack

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This commit is contained in:
Brian Anderson 2012-03-21 15:06:52 -07:00
parent f5f6135fd0
commit 9f89cc9d15
1 changed files with 30 additions and 41 deletions
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71
src/rt/arch/x86_64/morestack.S
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@ -49,30 +49,25 @@ MORESTACK:
// Calculate the CFA as on offset from %ebp
.cfi_def_cfa_register %rbp
pushq $0 // Alignment
subq $200, %rsp
// FIXME: libgcc also saves rax. not sure if we need to
// Save argument registers of the original function
pushq %rdi
pushq %rsi
pushq %rdx
pushq %rcx
pushq %r8
pushq %r9
pushq $0 // Alignment
pushq $0 // Alignment
subq $128, %rsp
movdqa %xmm0, (%rsp)
movdqa %xmm1, 16(%rsp)
movdqa %xmm2, 32(%rsp)
movdqa %xmm3, 48(%rsp)
movdqa %xmm4, 64(%rsp)
movdqa %xmm5, 80(%rsp)
movdqa %xmm6, 96(%rsp)
movdqa %xmm7, 112(%rsp)
movq %rdi, (%rsp)
movq %rsi, 8(%rsp)
movq %rdx, 16(%rsp)
movq %rcx, 24(%rsp)
movq %r8, 32(%rsp)
movq %r9, 40(%rsp)
movdqa %xmm0, 48(%rsp)
movdqa %xmm1, 64(%rsp)
movdqa %xmm2, 80(%rsp)
movdqa %xmm3, 96(%rsp)
movdqa %xmm4, 112(%rsp)
movdqa %xmm5, 128(%rsp)
movdqa %xmm6, 144(%rsp)
movdqa %xmm7, 160(%rsp)
// Calculate the address of the stack arguments.
// We have the base pointer, __morestack's return address,
@ -97,28 +92,22 @@ MORESTACK:
#endif
// Pop the saved arguments
movdqa (%rsp), %xmm0
movdqa 16(%rsp), %xmm1
movdqa 32(%rsp), %xmm2
movdqa 48(%rsp), %xmm3
movdqa 64(%rsp), %xmm4
movdqa 80(%rsp), %xmm5
movdqa 96(%rsp), %xmm6
movdqa 112(%rsp), %xmm7
addq $128, %rsp
movq (%rsp), %rdi
movq 8(%rsp), %rsi
movq 16(%rsp), %rdx
movq 24(%rsp), %rcx
movq 32(%rsp), %r8
movq 40(%rsp), %r9
movdqa 48(%rsp), %xmm0
movdqa 64(%rsp), %xmm1
movdqa 80(%rsp), %xmm2
movdqa 96(%rsp), %xmm3
movdqa 112(%rsp), %xmm4
movdqa 128(%rsp), %xmm5
movdqa 144(%rsp), %xmm6
movdqa 160(%rsp), %xmm7
popq %r9 // Alignment
popq %r9 // Alignment
popq %r9
popq %r8
popq %rcx
popq %rdx
popq %rsi
popq %rdi
// Pop the unwinding %rsp
addq $8, %rsp
addq $200, %rsp
movq 8(%rbp),%r10 // Grab the return pointer.
incq %r10 // Skip past the `ret` in our parent frame