From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, Mark Johnston <markj@FreeBSD.org>,
Warner Losh <imp@bsdimp.com>, Juergen Lock <nox@FreeBSD.org>
Subject: [PULL 3/4] tcg: Use correct trap number for page faults on *BSD systems
Date: Thu, 13 May 2021 07:20:07 -0500 [thread overview]
Message-ID: <20210513122008.207491-4-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210513122008.207491-1-richard.henderson@linaro.org>
From: Warner Losh <imp@bsdimp.com>
The trap number for a page fault on BSD systems is T_PAGEFLT not 0xe. 0xe is
used by Linux and represents the intel hardware trap vector. The BSD kernels,
however, translate this to T_PAGEFLT in their Xpage, Xtrap0e, Xtrap14, etc fault
handlers. This is true for i386 and x86_64, though the name of the trap hanlder
can very on the flavor of BSD. As far as I can tell, Linux doesn't provide a
define for this value. Invent a new one (PAGE_FAULT_TRAP) and use it instead to
avoid uglier ifdefs.
Signed-off-by: Mark Johnston <markj@FreeBSD.org>
Signed-off-by: Juergen Lock <nox@FreeBSD.org>
[ Rework to avoid ifdefs and expand it to i386 ]
Signed-off-by: Warner Losh <imp@bsdimp.com>
Message-Id: <20210506173826.72832-1-imp@bsdimp.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
accel/tcg/user-exec.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index fb2d43e6a9..d2acf6e82c 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -259,6 +259,7 @@ void *probe_access(CPUArchState *env, target_ulong addr, int size,
#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
#define MASK_sig(context) ((context)->uc_sigmask)
+#define PAGE_FAULT_TRAP T_PAGEFLT
#elif defined(__FreeBSD__) || defined(__DragonFly__)
#include <ucontext.h>
@@ -266,16 +267,19 @@ void *probe_access(CPUArchState *env, target_ulong addr, int size,
#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
#define MASK_sig(context) ((context)->uc_sigmask)
+#define PAGE_FAULT_TRAP T_PAGEFLT
#elif defined(__OpenBSD__)
#define EIP_sig(context) ((context)->sc_eip)
#define TRAP_sig(context) ((context)->sc_trapno)
#define ERROR_sig(context) ((context)->sc_err)
#define MASK_sig(context) ((context)->sc_mask)
+#define PAGE_FAULT_TRAP T_PAGEFLT
#else
#define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
#define MASK_sig(context) ((context)->uc_sigmask)
+#define PAGE_FAULT_TRAP 0xe
#endif
int cpu_signal_handler(int host_signum, void *pinfo,
@@ -301,7 +305,8 @@ int cpu_signal_handler(int host_signum, void *pinfo,
pc = EIP_sig(uc);
trapno = TRAP_sig(uc);
return handle_cpu_signal(pc, info,
- trapno == 0xe ? (ERROR_sig(uc) >> 1) & 1 : 0,
+ trapno == PAGE_FAULT_TRAP ?
+ (ERROR_sig(uc) >> 1) & 1 : 0,
&MASK_sig(uc));
}
@@ -312,11 +317,13 @@ int cpu_signal_handler(int host_signum, void *pinfo,
#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
#define MASK_sig(context) ((context)->uc_sigmask)
+#define PAGE_FAULT_TRAP T_PAGEFLT
#elif defined(__OpenBSD__)
#define PC_sig(context) ((context)->sc_rip)
#define TRAP_sig(context) ((context)->sc_trapno)
#define ERROR_sig(context) ((context)->sc_err)
#define MASK_sig(context) ((context)->sc_mask)
+#define PAGE_FAULT_TRAP T_PAGEFLT
#elif defined(__FreeBSD__) || defined(__DragonFly__)
#include <ucontext.h>
@@ -324,11 +331,13 @@ int cpu_signal_handler(int host_signum, void *pinfo,
#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
#define MASK_sig(context) ((context)->uc_sigmask)
+#define PAGE_FAULT_TRAP T_PAGEFLT
#else
#define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
#define MASK_sig(context) ((context)->uc_sigmask)
+#define PAGE_FAULT_TRAP 0xe
#endif
int cpu_signal_handler(int host_signum, void *pinfo,
@@ -346,7 +355,8 @@ int cpu_signal_handler(int host_signum, void *pinfo,
pc = PC_sig(uc);
return handle_cpu_signal(pc, info,
- TRAP_sig(uc) == 0xe ? (ERROR_sig(uc) >> 1) & 1 : 0,
+ TRAP_sig(uc) == PAGE_FAULT_TRAP ?
+ (ERROR_sig(uc) >> 1) & 1 : 0,
&MASK_sig(uc));
}
--
2.25.1
next prev parent reply other threads:[~2021-05-13 12:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-13 12:20 [PULL 0/4] tcg patch queue Richard Henderson
2021-05-13 12:20 ` [PULL 1/4] MAINTAINERS: Add include/exec/gen-icount.h to 'Main Loop' section Richard Henderson
2021-05-13 12:20 ` [PULL 2/4] exec/gen-icount.h: Add missing "exec/exec-all.h" include Richard Henderson
2021-05-13 12:20 ` Richard Henderson [this message]
2021-05-13 12:20 ` [PULL 4/4] tcg: Add tcg_constant_tl Richard Henderson
2021-05-14 11:03 ` [PULL 0/4] tcg patch queue Peter Maydell
2021-05-14 14:39 ` Philippe Mathieu-Daudé
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