| // Mark stack as non-executable |
| #if defined(__linux__) && defined(__ELF__) |
| .section .note.GNU-stack, "", %progbits |
| #endif |
| |
| /* See i386/morestack.S for the lengthy, general explanation. */ |
| |
| .text |
| .code 32 |
| .arm |
| #if defined(__APPLE__) |
| .align 2 |
| #else |
| .align |
| #endif |
| |
| #if defined(__APPLE__) |
| #define MORESTACK ___morestack |
| #define STACK_EXHAUSTED _rust_stack_exhausted |
| #else |
| #define MORESTACK __morestack |
| #define STACK_EXHAUSTED rust_stack_exhausted |
| #endif |
| |
| .global STACK_EXHAUSTED |
| .global MORESTACK |
| |
| // Unfortunately LLVM yet doesn't support emitting correct debug |
| // DWARF information for non-ELF targets so to make it compile |
| // on iOS all that directives are simply commented out |
| #if defined(__APPLE__) |
| #define UNWIND @ |
| #else |
| #define UNWIND |
| #endif |
| |
| #if defined(__APPLE__) |
| .private_extern MORESTACK |
| #else |
| .hidden MORESTACK |
| #endif |
| |
| #if !defined(__APPLE__) |
| .type MORESTACK,%function |
| #endif |
| |
| // r4 and r5 are scratch registers for __morestack due to llvm |
| // ARMFrameLowering::adjustForSegmentedStacks() implementation. |
| MORESTACK: |
| UNWIND .fnstart |
| |
| // Save frame pointer and return address |
| UNWIND .save {r4, r5} |
| UNWIND .save {lr} |
| UNWIND .save {r6, fp, lr} |
| push {r6, fp, lr} |
| |
| UNWIND .movsp r6 |
| mov r6, sp |
| UNWIND .setfp fp, sp, #4 |
| add fp, sp, #4 |
| |
| // Save argument registers of the original function |
| push {r0, r1, r2, r3, lr} |
| |
| // Create new stack |
| bl STACK_EXHAUSTED@plt |
| |
| // the above function ensures that it never returns |
| UNWIND .fnend |
