Most linux-user targets so far do not distinguish between SEGV_MAPERR
and SEGV_ACCERR. This function will be used to fix that.
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
linux-user/signal-common.h | 1 +
linux-user/signal.c | 18 ++++++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/linux-user/signal-common.h b/linux-user/signal-common.h
index 536c7ac2c2..9090bbb315 100644
--- a/linux-user/signal-common.h
+++ b/linux-user/signal-common.h
@@ -40,6 +40,7 @@ void tswap_siginfo(target_siginfo_t *tinfo,
void set_sigmask(const sigset_t *set);
void force_sig(int sig);
void force_sigsegv(int oldsig);
+void force_sigsegv_for_addr(abi_ulong addr);
void force_sig_fault(int sig, int code, abi_ulong addr);
#if defined(TARGET_ARCH_HAS_SETUP_FRAME)
void setup_frame(int sig, struct target_sigaction *ka,
diff --git a/linux-user/signal.c b/linux-user/signal.c
index 5ea8e4584a..0bb369c888 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -663,6 +663,24 @@ void force_sig_fault(int sig, int code, abi_ulong addr)
queue_signal(env, sig, QEMU_SI_FAULT, &info);
}
+/*
+ * Force a synchronously taken SIGSEGV signal for @addr.
+ * Distinguish between SEGV_MAPERR and SEGV_ACCERR here,
+ * in preference to doing that for each target.
+ */
+void force_sigsegv_for_addr(abi_ulong addr)
+{
+ /*
+ * MAPERR indicates the page is not present at all.
+ * Otherwise, it must have been a permission problem.
+ */
+ int si_code = TARGET_SEGV_MAPERR;
+ if (page_get_flags(addr) & PAGE_VALID) {
+ si_code = TARGET_SEGV_ACCERR;
+ }
+ force_sig_fault(TARGET_SIGSEGV, si_code, addr);
+}
+
/* Force a SIGSEGV if we couldn't write to memory trying to set
* up the signal frame. oldsig is the signal we were trying to handle
* at the point of failure.
--
2.25.1
