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author | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2017-09-19 15:01:23 +0200 |
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committer | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2017-10-02 11:20:55 +0200 |
commit | cbddcc7fc309c251e2cf6677324ff0c772007159 (patch) | |
tree | e10ebbcc6ba602866d0090de6d1779e3162b47c5 /arch/arm/mach-rockchip/bootrom.c | |
parent | 260321c8dd2d9096a51178a2d312681bab2ff41a (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/mach-rockchip/bootrom.c')
0 files changed, 0 insertions, 0 deletions