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Fix access to the rust stack.

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This commit is contained in:
Rafael Ávila de Espíndola 2011-03-09 15:05:22 -05:00
parent aeca138944
commit 10d8b4e861
1 changed files with 32 additions and 15 deletions
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47
src/comp/back/x86.rs
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@ -25,22 +25,39 @@ fn restore_callee_saves() -> vec[str] {
"popl %ebp");
}
fn load_esp_from_rust_sp() -> vec[str] {
fn load_esp_from_rust_sp_first_arg() -> vec[str] {
ret vec("movl " + wstr(abi.task_field_rust_sp) + "(%ecx), %esp");
}
fn load_esp_from_runtime_sp() -> vec[str] {
fn load_esp_from_runtime_sp_first_arg() -> vec[str] {
ret vec("movl " + wstr(abi.task_field_runtime_sp) + "(%ecx), %esp");
}
fn store_esp_to_rust_sp() -> vec[str] {
fn store_esp_to_rust_sp_first_arg() -> vec[str] {
ret vec("movl %esp, " + wstr(abi.task_field_rust_sp) + "(%ecx)");
}
fn store_esp_to_runtime_sp() -> vec[str] {
fn store_esp_to_runtime_sp_first_arg() -> vec[str] {
ret vec("movl %esp, " + wstr(abi.task_field_runtime_sp) + "(%ecx)");
}
fn load_esp_from_rust_sp_second_arg() -> vec[str] {
ret vec("movl " + wstr(abi.task_field_rust_sp) + "(%edx), %esp");
}
fn load_esp_from_runtime_sp_second_arg() -> vec[str] {
ret vec("movl " + wstr(abi.task_field_runtime_sp) + "(%edx), %esp");
}
fn store_esp_to_rust_sp_second_arg() -> vec[str] {
ret vec("movl %esp, " + wstr(abi.task_field_rust_sp) + "(%edx)");
}
fn store_esp_to_runtime_sp_second_arg() -> vec[str] {
ret vec("movl %esp, " + wstr(abi.task_field_runtime_sp) + "(%edx)");
}
/*
* This is a bit of glue-code. It should be emitted once per
* compilation unit.
@ -61,8 +78,8 @@ fn store_esp_to_runtime_sp() -> vec[str] {
fn rust_activate_glue() -> vec[str] {
ret vec("movl 4(%esp), %ecx # ecx = rust_task")
+ save_callee_saves()
+ store_esp_to_runtime_sp()
+ load_esp_from_rust_sp()
+ store_esp_to_runtime_sp_first_arg()
+ load_esp_from_rust_sp_first_arg()
/*
* There are two paths we can arrive at this code from:
@ -154,10 +171,10 @@ fn rust_activate_glue() -> vec[str] {
fn rust_yield_glue() -> vec[str] {
ret vec("movl 0(%esp), %ecx # ecx = rust_task")
+ load_esp_from_rust_sp()
+ load_esp_from_rust_sp_first_arg()
+ save_callee_saves()
+ store_esp_to_rust_sp()
+ load_esp_from_runtime_sp()
+ store_esp_to_rust_sp_first_arg()
+ load_esp_from_runtime_sp_first_arg()
+ restore_callee_saves()
+ vec("ret");
}
@ -192,19 +209,19 @@ fn upcall_glue(int n_args) -> vec[str] {
+ vec("movl %esp, %ebp # ebp = rust_sp")
+ store_esp_to_rust_sp()
+ load_esp_from_runtime_sp()
+ store_esp_to_rust_sp_second_arg()
+ load_esp_from_runtime_sp_second_arg()
+ vec("subl $" + wstr(n_args + 1) + ", %esp # esp -= args",
"andl $~0xf, %esp # align esp down")
+ _vec.init_fn[str](carg, (n_args + 1) as uint)
+ vec("movl %edx, %edi # save task from ecx to edi",
"call *%ecx # call *%edx",
"movl %edi, %edx # restore edi-saved task to ecx")
+ vec("movl %edx, %edi # save task from edx to edi",
"call *%ecx # call *%ecx",
"movl %edi, %edx # restore edi-saved task to edx")
+ load_esp_from_rust_sp()
+ load_esp_from_rust_sp_second_arg()
+ restore_callee_saves()
+ vec("ret");