rt: Fix assembler for C calls to work more like a regular function call
This commit is contained in:
parent
6dece91ed3
commit
e31849fb79
|
@ -1,14 +1,17 @@
|
|||
.text
|
||||
|
||||
// upcall_call_c_stack(void (*fn)(), void *new_esp)
|
||||
//
|
||||
// Note that we could use |enter| and |leave| but the manuals tell me they're
|
||||
// slower.
|
||||
.globl _upcall_call_c_stack
|
||||
_upcall_call_c_stack:
|
||||
movl %esp,%ecx // grab esp
|
||||
movl 8(%esp),%eax // save fn
|
||||
pushl %ebp
|
||||
movl %esp,%ebp // save esp
|
||||
movl 8(%esp),%eax // eax = callee
|
||||
movl 12(%esp),%esp // switch stack
|
||||
pushl %ecx // save esp on stack
|
||||
calll *%eax
|
||||
popl %esp // restore esp
|
||||
movl %ebp,%esp // would like to use "leave" but it's slower
|
||||
popl %ebp
|
||||
ret
|
||||
|
||||
|
||||
|
|
Loading…
Reference in New Issue