diff options
Diffstat (limited to 'wasm/setjmp_core.S')
| -rw-r--r-- | wasm/setjmp_core.S | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/wasm/setjmp_core.S b/wasm/setjmp_core.S new file mode 100644 index 0000000000..4a7194056e --- /dev/null +++ b/wasm/setjmp_core.S @@ -0,0 +1,27 @@ + # extern int _rb_wasm_setjmp_internal(rb_wasm_jmp_buf *env); + .functype _rb_wasm_setjmp_internal (i32) -> (i32) + # extern int __stack_pointer; + .globaltype __stack_pointer, i32 + + # A wrapper of _rb_wasm_setjmp_internal to save and restore stack pointer + # This cannot be implemented in C because there is no way to manipulate stack pointer + # without C-epilogue. + + # extern int _rb_wasm_setjmp(rb_wasm_jmp_buf *env); + .section .text._rb_wasm_setjmp,"",@ + .globl _rb_wasm_setjmp + .type _rb_wasm_setjmp,@function +_rb_wasm_setjmp: + .functype _rb_wasm_setjmp (i32) -> (i32) + .local i32, i32 + # save sp (this local is stored in asyncify stack and restored when rewinding) + global.get __stack_pointer + local.set 1 + + local.get 0 + call _rb_wasm_setjmp_internal + + # restore sp + local.get 1 + global.set __stack_pointer + end_function |