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| author | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2017-09-19 15:01:23 +0200 |
|---|---|---|
| committer | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2017-11-01 23:20:55 +0100 |
| commit | b80123230cda30eacd465e945c065e1a7e068877 (patch) | |
| tree | 25d086567b099d05af7f688f057c9210493772ab /arch/arm/lib/Makefile | |
| parent | c39aea24c99cb375d06e48f533ebe245d73abd73 (diff) | |
arm: provide a PCS-compliant setjmp implementation
The previous setjmp-implementation (as a static inline function that
contained an 'asm volatile' sequence) was extremely fragile: (some
versions of) GCC optimised the set of registers. One critical example
was the removal of 'r9' from the clobber list, if -ffixed-reg9 was
supplied.
To increase robustness and ensure PCS-compliant behaviour, the setjmp
and longjmp implementation are now in assembly and closely match what
one would expect to find in a libc implementation.
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Andy Yan <andy.yan@rock-chips.com>
Series-changes: 3
- converted setjmp/longjmp from inline-assembly to separate .S files
to improve predicatability if emitted code
Diffstat (limited to 'arch/arm/lib/Makefile')
| -rw-r--r-- | arch/arm/lib/Makefile | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile index 6e1c436933..abffa10c85 100644 --- a/arch/arm/lib/Makefile +++ b/arch/arm/lib/Makefile @@ -17,6 +17,12 @@ else obj-y += vectors.o crt0.o endif +ifdef CONFIG_ARM64 +obj-y += setjmp_aarch64.o +else +obj-y += setjmp.o +endif + ifndef CONFIG_SPL_BUILD ifdef CONFIG_ARM64 obj-y += relocate_64.o |