From 790ed28afff8de7bbfbfccca1e5f4f22c00cfd01 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Timo=20Ter=C3=A4s?= Date: Wed, 18 Jul 2018 15:47:27 +0300 Subject: [PATCH] fix x86_64 register order for swapcontext rbp and rsi were reversed causing argument passing to fail since rsi is used to pass 2nd argument. fixes #9 --- arch/x86_64/swapcontext.S | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/x86_64/swapcontext.S b/arch/x86_64/swapcontext.S index 065af91..38e6c26 100644 --- a/arch/x86_64/swapcontext.S +++ b/arch/x86_64/swapcontext.S @@ -23,8 +23,8 @@ __swapcontext: movq %r14, 88(%rdi) movq %r15, 96(%rdi) movq %rdi, 104(%rdi) - movq %rbp, 112(%rdi) - movq %rsi, 120(%rdi) + movq %rsi, 112(%rdi) + movq %rbp, 120(%rdi) movq %rbx, 128(%rdi) movq %rdx, 136(%rdi) movq $1, 144(%rdi) /* $1 is %rax */ @@ -51,7 +51,7 @@ __swapcontext: movq 88(%rsi), %r14 movq 96(%rsi), %r15 movq 104(%rsi), %rdi - movq 112(%rsi), %rbp + movq 120(%rsi), %rbp movq 128(%rsi), %rbx movq 136(%rsi), %rdx movq 144(%rsi), %rax @@ -63,7 +63,7 @@ __swapcontext: pushq 168(%rsi) /* finally, set %rsi correctly since we do not need it anymore. */ - movq 120(%rsi), %rsi + movq 112(%rsi), %rsi /* we're all done here, return 0 */ xorl %eax, %eax -- 2.41.0