diff options
Diffstat (limited to 'src/runtime/asm_wasm.s')
| -rw-r--r-- | src/runtime/asm_wasm.s | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/runtime/asm_wasm.s b/src/runtime/asm_wasm.s index b44a4f7dd4..419640be2d 100644 --- a/src/runtime/asm_wasm.s +++ b/src/runtime/asm_wasm.s @@ -554,5 +554,57 @@ TEXT wasm_pc_f_loop(SB),NOSPLIT,$0 Return +// wasm_pc_f_loop_export is like wasm_pc_f_loop, except that this takes an +// argument (on Wasm stack) that is a PC_F, and the loop stops when we get +// to that PC in a normal return (not unwinding). +// This is for handling an wasmexport function when it needs to switch the +// stack. +TEXT wasm_pc_f_loop_export(SB),NOSPLIT,$0 + Get PAUSE + I32Eqz +outer: + If + // R1 is whether a function return normally (0) or unwinding (1). + // Start with unwinding. + I32Const $1 + Set R1 + loop: + Loop + // Get PC_F & PC_B from -8(SP) + Get SP + I32Const $8 + I32Sub + I32Load16U $2 // PC_F + Tee R2 + + Get R0 + I32Eq + If // PC_F == R0, we're at the stop PC + Get R1 + I32Eqz + // Break if it is a normal return + BrIf outer // actually jump to after the corresponding End + End + + Get SP + I32Const $8 + I32Sub + I32Load16U $0 // PC_B + + Get R2 // PC_F + CallIndirect $0 + Set R1 // save return/unwinding state for next iteration + + Get PAUSE + I32Eqz + BrIf loop + End + End + + I32Const $0 + Set PAUSE + + Return + TEXT wasm_export_lib(SB),NOSPLIT,$0 UNDEF |