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linux-user: Add infrastructure for a signal trampoline page

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Allocate a page to hold the signal trampoline(s).
Invoke a guest-specific hook to fill in the contents
of the page before marking it read-execute again.

Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210929130553.121567-2-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-09-29 09:05:28 -04:00 • committed by Laurent Vivier
parent bb4aa8f59e
commit db2af69d6b
3 changed files with 27 additions and 0 deletions
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6
linux-user/signal-common.h
View file

@ -20,6 +20,12 @@
#ifndef SIGNAL_COMMON_H
#define SIGNAL_COMMON_H
/* Fallback addresses into sigtramp page. */
extern abi_ulong default_sigreturn;
extern abi_ulong default_rt_sigreturn;
void setup_sigtramp(abi_ulong tramp_page);
int on_sig_stack(unsigned long sp);
int sas_ss_flags(unsigned long sp);
abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka);