diff options
| author | Keith Packard <keithp@keithp.com> | 2013-10-07 21:53:53 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2013-10-07 21:53:53 -0700 |
| commit | 8f7edcee2db30652ce0b147f282de3396c3786ad (patch) | |
| tree | 4be74830f12ad85e82eb159d7a73dc4aa0bb181f | |
| parent | 4254de22864de2ed7ae5928c6b8bfd9df1c8a3fb (diff) | |
altos/lpc, altos/stm: ARM requires ISB after switching stack pointers
This sticks a barrier in the CPU to prevent using the wrong stack
register past the change.
Signed-off-by: Keith Packard <keithp@keithp.com>
| -rw-r--r-- | src/lpc/ao_arch_funcs.h | 1 | ||||
| -rw-r--r-- | src/stm/ao_arch_funcs.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/src/lpc/ao_arch_funcs.h b/src/lpc/ao_arch_funcs.h index 9a3219a2..0891903e 100644 --- a/src/lpc/ao_arch_funcs.h +++ b/src/lpc/ao_arch_funcs.h @@ -235,6 +235,7 @@ static inline void ao_arch_start_scheduler(void) { asm("mrs %0,control" : "=&r" (control)); control |= (1 << 1); asm("msr control,%0" : : "r" (control)); + asm("isb"); } #endif /* _AO_ARCH_FUNCS_H_ */ diff --git a/src/stm/ao_arch_funcs.h b/src/stm/ao_arch_funcs.h index 9bb2d7cd..4bcc1023 100644 --- a/src/stm/ao_arch_funcs.h +++ b/src/stm/ao_arch_funcs.h @@ -354,6 +354,7 @@ static inline void ao_arch_start_scheduler(void) { asm("mrs %0,control" : "=&r" (control)); control |= (1 << 1); asm("msr control,%0" : : "r" (control)); + asm("isb"); } #endif |