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import lib.llvm.llvm;
import lib.llvm.llvm.ModuleRef;
import std._str;
import std._vec;
import std.os.target_os;
import util.common.istr;
const int wordsz = 4;
fn wstr(int i) -> str {
ret istr(i * wordsz);
}
fn save_callee_saves() -> vec[str] {
ret vec("pushl %ebp",
"pushl %edi",
"pushl %esi",
"pushl %ebx");
}
fn restore_callee_saves() -> vec[str] {
ret vec("popl %ebx",
"popl %esi",
"popl %edi",
"popl %ebp");
}
fn load_esp_from_rust_sp() -> vec[str] {
ret vec("movl " + wstr(abi.task_field_rust_sp) + "(%edx), %esp");
}
fn load_esp_from_runtime_sp() -> vec[str] {
ret vec("movl " + wstr(abi.task_field_runtime_sp) + "(%edx), %esp");
}
fn store_esp_to_rust_sp() -> vec[str] {
ret vec("movl %esp, " + wstr(abi.task_field_rust_sp) + "(%edx)");
}
fn store_esp_to_runtime_sp() -> vec[str] {
ret vec("movl %esp, " + wstr(abi.task_field_runtime_sp) + "(%edx)");
}
fn rust_activate_glue() -> vec[str] {
ret vec("movl 4(%esp), %edx # edx = rust_task")
+ save_callee_saves()
+ store_esp_to_runtime_sp()
+ load_esp_from_rust_sp()
// This 'add' instruction is a bit surprising.
// See lengthy comment in boot/be/x86.ml activate_glue.
+ vec("addl $20, " + wstr(abi.task_field_rust_sp) + "(%edx)")
+ restore_callee_saves()
+ vec("ret");
}
fn rust_yield_glue() -> vec[str] {
ret vec("movl 0(%esp), %edx # edx = rust_task")
+ load_esp_from_rust_sp()
+ save_callee_saves()
+ store_esp_to_rust_sp()
+ load_esp_from_runtime_sp()
+ restore_callee_saves()
+ vec("ret");
}
fn upcall_glue(int n_args) -> vec[str] {
/*
* 0, 4, 8, 12 are callee-saves
* 16 is retpc
* 20 is taskptr
* 24 is callee
* 28 .. (7+i) * 4 are args
*/
fn copy_arg(uint i) -> str {
auto src_off = wstr(7 + (i as int));
auto dst_off = wstr(1 + (i as int));
auto m = vec("movl " + src_off + "(%ebp),%edx",
"movl %edx," + dst_off + "(%esp)");
ret _str.connect(m, "\n\t");
}
auto carg = copy_arg;
ret
save_callee_saves()
+ vec("movl %esp, %ebp # ebp = rust_sp",
"movl 20(%esp), %edx # edx = rust_task")
+ store_esp_to_rust_sp()
+ load_esp_from_runtime_sp()
+ vec("subl $" + wstr(n_args + 1) + ", %esp # esp -= args",
"andl $~0xf, %esp # align esp down",
"movl %edx, (%esp) # arg[0] = rust_task ")
+ _vec.init_fn[str](carg, n_args as uint)
+ vec("movl 24(%ebp), %edx # edx = callee",
"call *%edx # call *%edx",
"movl 20(%ebp), %edx # edx = rust_task")
+ load_esp_from_rust_sp()
+ restore_callee_saves()
+ vec("ret");
}
fn decl_glue(int align, str prefix, str name, vec[str] insns) -> str {
auto sym = prefix + name;
ret "\t.globl " + sym + "\n" +
"\t.balign " + istr(align) + "\n" +
sym + ":\n" +
"\t" + _str.connect(insns, "\n\t");
}
fn decl_upcall_glue(int align, str prefix, uint n) -> str {
let int i = n as int;
ret decl_glue(align, prefix,
abi.upcall_glue_name(i),
upcall_glue(i));
}
fn get_module_asm() -> str {
auto align = 4;
auto prefix = "";
if (_str.eq(target_os(), "macos")) {
prefix = "_";
}
auto glues =
vec(decl_glue(align, prefix,
abi.activate_glue_name(),
rust_activate_glue()),
decl_glue(align, prefix,
abi.yield_glue_name(),
rust_yield_glue()))
+ _vec.init_fn[str](bind decl_upcall_glue(align, prefix, _),
abi.n_upcall_glues as uint);
ret _str.connect(glues, "\n\n");
}
//
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End:
//
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