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| author | Tristan Gingold | 2014-11-19 08:38:21 +0100 |
|---|---|---|
| committer | Tristan Gingold | 2014-11-19 08:38:21 +0100 |
| commit | 5013e9842bce26cefca914ddeaff78eb19a2bae9 (patch) | |
| tree | efbe9a0b72fdce918efb221c917c024bed409c4c /src/grt/config | |
| parent | 65945d1b0fef7ad3e087adc6a20891fcb2c1652a (diff) | |
| download | ghdl-5013e9842bce26cefca914ddeaff78eb19a2bae9.tar.gz ghdl-5013e9842bce26cefca914ddeaff78eb19a2bae9.tar.bz2 ghdl-5013e9842bce26cefca914ddeaff78eb19a2bae9.zip | |
amd64.S: add a null-frame.
Diffstat (limited to 'src/grt/config')
| -rw-r--r-- | src/grt/config/amd64.S | 53 |
1 files changed, 30 insertions, 23 deletions
diff --git a/src/grt/config/amd64.S b/src/grt/config/amd64.S index 0a7f004..bdf5294 100644 --- a/src/grt/config/amd64.S +++ b/src/grt/config/amd64.S @@ -1,4 +1,4 @@ -/* GRT stack implementation for amd64 (x86_64) +/* GRT stack implementation for amd64 (x86_64) -*- asm -*- Copyright (C) 2005 - 2014 Tristan Gingold. GHDL is free software; you can redistribute it and/or modify it under @@ -40,11 +40,20 @@ #endif .text - /* Function called to loop on the process. */ + /* Function called to loop on the process. + At entry | Frame | In body + ----------+-----------------+--------- + %rsp | 0 (ret addr) | %rbp+8 + | saved %rbp | %rbp + */ ENTRY(grt_stack_loop) - mov 0(%rsp),%rdi - call *8(%rsp) - jmp NAME(grt_stack_loop) + /* Standard prologue. */ + pushq %rbp + movq %rsp,%rbp + /* Body. */ +0: mov %r13,%rdi + call %r12 + jmp 0b END(grt_stack_loop) /* function Stack_Create (Func : Address; Arg : Address) @@ -68,30 +77,28 @@ ENTRY(grt_stack_create) /* Note: %RAX contains the address of the stack_context. This is also the top of the stack. */ - /* Prepare stack. */ - /* The function to be executed. */ - mov -8(%rbp), %rdi - mov %rdi, -8(%rax) - /* The argument. */ - mov -16(%rbp), %rsi - mov %rsi, -16(%rax) - /* The return function. Must be 8 mod 16. */ + /* Prepare fake frame for stack_loop. */ + xorq %rsi, %rsi + mov %rsi,-8(%rax) /* Null return address (must be 8 mod 16). */ + /* The return function. */ #if __APPLE__ - movq _grt_stack_loop@GOTPCREL(%rip), %rsi - movq %rsi, -24(%rax) + movq _grt_stack_loop@GOTPCREL(%rip), %rdi + movq %rdi, -16(%rax) #else - movq $grt_stack_loop, -24(%rax) + movq $grt_stack_loop, -16(%rax) #endif /* The context. */ - mov %rbp, -32(%rax) - mov %rbx, -40(%rax) - mov %r12, -48(%rax) - mov %r13, -56(%rax) - mov %r14, -64(%rax) - mov %r15, -72(%rax) + mov %rsi, -24(%rax) /* %rbp <- 0 (null frame) */ + mov %rbx, -32(%rax) + mov -8(%rbp), %rdi + mov %rdi, -40(%rax) /* %r12 <- function address. */ + mov -16(%rbp), %rdi + mov %rdi, -48(%rax) /* %r13 <- function argument. */ + mov %r14, -56(%rax) + mov %r15, -64(%rax) /* Save the new stack pointer to the stack context. */ - lea -72(%rax), %rsi + lea -64(%rax), %rsi mov %rsi, (%rax) .Ldone: |