| .globl emscripten_stack_init |
| .globl emscripten_stack_set_limits |
| .globl emscripten_stack_get_free |
| .globl emscripten_stack_get_base |
| .globl emscripten_stack_get_end |
| |
| #ifdef __wasm64__ |
| #define PTR i64 |
| #define ALIGN 3 |
| #define PTRSTORE .int64 |
| #else |
| #define PTR i32 |
| #define ALIGN 2 |
| #define PTRSTORE .int32 |
| #endif |
| |
| .globaltype __stack_pointer, PTR |
| |
| .section .globals,"",@ |
| |
| # TODO(sbc): It would be nice if these were initialized directly |
| # using PTR.const rather than using the `emscripten_stack_init` |
| .globaltype __stack_end, PTR |
| __stack_end: |
| .globaltype __stack_base, PTR |
| __stack_base: |
| |
| .section .text,"",@ |
| |
| emscripten_stack_get_base: |
| .functype emscripten_stack_get_base () -> (PTR) |
| global.get __stack_base |
| end_function |
| |
| emscripten_stack_get_end: |
| .functype emscripten_stack_get_end () -> (PTR) |
| global.get __stack_end |
| end_function |
| |
| emscripten_stack_init: |
| # Initialize __stack_end and __stack_base. |
| # This must be called before emscripten_stack_get_end, |
| # emscripten_stack_get_base, or emscripten_stack_get_free are called |
| .functype emscripten_stack_init () -> () |
| |
| # What llvm calls __stack_high is the high address from where it grows |
| # downwards. We call this the stack base here in emscripten. |
| #ifdef __PIC__ |
| global.get __stack_high@GOT |
| #else |
| PTR.const __stack_high |
| #endif |
| global.set __stack_base |
| |
| # What llvm calls __stack_low is that end of the stack |
| #ifdef __PIC__ |
| global.get __stack_low@GOT |
| #else |
| PTR.const __stack_low |
| #endif |
| # Align up to 16 bytes |
| PTR.const 0xf |
| PTR.add |
| PTR.const -0x10 |
| PTR.and |
| global.set __stack_end |
| |
| end_function |
| |
| emscripten_stack_set_limits: |
| .functype emscripten_stack_set_limits (PTR, PTR) -> () |
| local.get 0 |
| global.set __stack_base |
| local.get 1 |
| global.set __stack_end |
| end_function |
| |
| emscripten_stack_get_free: |
| .functype emscripten_stack_get_free () -> (PTR) |
| global.get __stack_pointer |
| global.get __stack_end |
| PTR.sub |
| end_function |
| |
| # Add emscripten_stack_init to static ctors |
| .section .init_array.1,"",@ |
| .p2align ALIGN |
| PTRSTORE emscripten_stack_init |
