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core: chibios: bootloader: use integer pointers as volatile (#13450)

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This prevents gcc from incorrectly trying to validate array bounds.

```
tmk_core/common/chibios/bootloader.c: error: '__builtin_memcpy' offset [0, 21] is out of the bounds [0, 0] [-Werror=array-bounds]
  107 |     __builtin_memcpy((void *) VBAT, (const void *)sys_reset_to_loader_magic, sizeof(sys_reset_to_loader_magic));
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578#c16
Fixes #12925
This commit is contained in:
Thomas Weißschuh 2021-07-06 01:24:48 +02:00 committed by GitHub
parent 82137e14f2
commit a535d24ecf
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 1 deletions
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3
tmk_core/common/chibios/bootloader.c
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@ -103,7 +103,8 @@ void enter_bootloader_mode_if_requested(void) {
# define SCB_AIRCR_VECTKEY_WRITEMAGIC 0x05FA0000
const uint8_t sys_reset_to_loader_magic[] = "\xff\x00\x7fRESET TO LOADER\x7f\x00\xff";
__attribute__((weak)) void bootloader_jump(void) {
__builtin_memcpy((void *)VBAT, (const void *)sys_reset_to_loader_magic, sizeof(sys_reset_to_loader_magic));
void *volatile vbat = (void *)VBAT;
__builtin_memcpy(vbat, (const void *)sys_reset_to_loader_magic, sizeof(sys_reset_to_loader_magic));
// request reset
SCB->AIRCR = SCB_AIRCR_VECTKEY_WRITEMAGIC | SCB_AIRCR_SYSRESETREQ_Msk;
}