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| author |  Jonas Schievink <jonasschievink@gmail.com>
| 2021-01-06 17:43:05 +0100 |
|---|---|---|
| committer | Jonas Schievink <jonasschievink@gmail.com>
| 2021-01-06 17:43:05 +0100 |
| commit | 0e82907ca384d10a7fb1f2b8cc70fdb58c0b2fcf (patch) | |
| tree | 2c6e827ad4e6424fbfc48ec028c3ef7518705763 | |
| parent | f6b4e97ab83df2e70e2dc0c35e51394fd1f4e256 (diff) | |
| download | cortex-m-0e82907ca384d10a7fb1f2b8cc70fdb58c0b2fcf.tar.gz cortex-m-0e82907ca384d10a7fb1f2b8cc70fdb58c0b2fcf.tar.zst cortex-m-0e82907ca384d10a7fb1f2b8cc70fdb58c0b2fcf.zip | |
Update `PreResetTrampoline` docs
| -rw-r--r-- | cortex-m-rt/asm.s | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/cortex-m-rt/asm.s b/cortex-m-rt/asm.s index a5c340e..6cae842 100644 --- a/cortex-m-rt/asm.s +++ b/cortex-m-rt/asm.s @@ -49,8 +49,6 @@ FpuTrampoline: .cfi_endproc .size FpuTrampoline, . - FpuTrampoline - # ARMv6-M leaves LR in an unknown state on Reset - # this trampoline sets LR before it's pushed onto the stack by Reset .section .PreResetTrampoline, "ax" .global PreResetTrampoline # .type and .thumb_func are both required; otherwise its Thumb bit does not @@ -58,6 +56,8 @@ FpuTrampoline: .type PreResetTrampoline,%function .thumb_func .cfi_startproc + # Main entry point. This initializes RAM and invokes __pre_init, which cannot be done in Rust code + # without invoking UB. It then jumps to the Rust `Reset` function. PreResetTrampoline: # set LR to the initial value used by the ARMv7-M (0xFFFF_FFFF) ldr r4,=0xffffffff |