diff options
Diffstat (limited to 'cortex-m-rt/asm.S')
| -rw-r--r-- | cortex-m-rt/asm.S | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/cortex-m-rt/asm.S b/cortex-m-rt/asm.S index 6254129..0d078b3 100644 --- a/cortex-m-rt/asm.S +++ b/cortex-m-rt/asm.S @@ -94,6 +94,14 @@ Reset: #endif 4: + # Preserve `lr` and emit debuginfo that lets external tools restore it. + # This fixes unwinding past the `Reset` handler. + # See https://sourceware.org/binutils/docs/as/CFI-directives.html for an + # explanation of the directives. +.cfi_def_cfa sp, 0 + push {lr} +.cfi_offset lr, 0 + # Jump to user main function. We use bl for the extended range, but the # user main function may not return. bl main |