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| author | Richard Henderson | 2021-09-29 15:05:36 +0200 |
|---|---|---|
| committer | Laurent Vivier | 2021-10-01 12:03:48 +0200 |
| commit | a22fccd8b7de9e21fc31cc048e2bf9c15947f4a4 (patch) | |
| tree | 2591f2958931627425c15849fe1c3df61f17e111 /linux-user/hppa | |
| parent | linux-user/hexagon: Implement setup_sigtramp (diff) | |
| download | qemu-a22fccd8b7de9e21fc31cc048e2bf9c15947f4a4.tar.gz qemu-a22fccd8b7de9e21fc31cc048e2bf9c15947f4a4.tar.xz qemu-a22fccd8b7de9e21fc31cc048e2bf9c15947f4a4.zip | |
linux-user/hppa: Document non-use of setup_sigtramp
We cannot use a raw sigtramp page for hppa,
but must wait for full vdso support.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210929130553.121567-10-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user/hppa')
| -rw-r--r-- | linux-user/hppa/target_signal.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/linux-user/hppa/target_signal.h b/linux-user/hppa/target_signal.h index 7f525362e9..d558119ee7 100644 --- a/linux-user/hppa/target_signal.h +++ b/linux-user/hppa/target_signal.h @@ -71,4 +71,18 @@ typedef struct target_sigaltstack { /* mask for all SS_xxx flags */ #define TARGET_SS_FLAG_BITS TARGET_SS_AUTODISARM +/* + * We cannot use a bare sigtramp page for hppa-linux. + * + * Unlike other guests where we use the instructions at PC to validate + * an offset from SP, the hppa libgcc signal frame fallback unwinding uses + * the PC address itself to find the frame. This is due to the fact that + * the hppa grows the stack upward, and the frame is of unknown size. + * + * TODO: We should be able to use a VDSO to address this, by providing + * proper unwind info for the sigtramp code, at which point the fallback + * unwinder will not be used. + */ +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 0 + #endif /* HPPA_TARGET_SIGNAL_H */ |