Subject: [PATCH 38/91] um: finish conversion to mcontext_t
From: Al Viro
Date: Thu Aug 18 2011 - 15:05:32 EST
now we don't mix host and guest signal frame layouts anymore; moreover,
we don't need host's struct sigcontext at all.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
arch/um/os-Linux/signal.c | 6 ++--
arch/um/os-Linux/sys-x86/Makefile | 2 +-
arch/um/os-Linux/sys-x86/mcontext.c | 31 ++++++++++++++++++++++++
arch/um/sys-x86/shared/sysdep/mcontext.h | 31 ++++++++++++++++++++++++
arch/um/sys-x86/shared/sysdep/sigcontext.h | 5 ----
arch/um/sys-x86/shared/sysdep/sigcontext_32.h | 32 -------------------------
arch/um/sys-x86/shared/sysdep/sigcontext_64.h | 32 -------------------------
arch/um/sys-x86/stub_segv.c | 2 +-
arch/um/sys-x86/user-offsets.c | 7 -----
9 files changed, 67 insertions(+), 81 deletions(-)
create mode 100644 arch/um/os-Linux/sys-x86/mcontext.c
create mode 100644 arch/um/sys-x86/shared/sysdep/mcontext.h
delete mode 100644 arch/um/sys-x86/shared/sysdep/sigcontext.h
delete mode 100644 arch/um/sys-x86/shared/sysdep/sigcontext_32.h
delete mode 100644 arch/um/sys-x86/shared/sysdep/sigcontext_64.h
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 07d9905..9f2c222 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -14,7 +14,7 @@
#include "os.h"
#include "process.h"
#include "sysdep/barrier.h"
-#include "sysdep/sigcontext.h"
+#include "sysdep/mcontext.h"
void (*sig_info[NSIG])(int, struct uml_pt_regs *) = {
[SIGTRAP] = relay_signal,
@@ -34,7 +34,7 @@ static void sig_handler_common(int sig, mcontext_t *mc)
r.is_user = 0;
if (sig == SIGSEGV) {
/* For segfaults, we want the data from the sigcontext. */
- copy_sc(&r, (struct sigcontext *)mc);
+ get_regs_from_mc(&r, mc);
GET_FAULTINFO_FROM_MC(r.faultinfo, mc);
}
@@ -84,7 +84,7 @@ static void real_alarm_handler(mcontext_t *mc)
struct uml_pt_regs regs;
if (mc != NULL)
- copy_sc(®s, (struct sigcontext *)mc);
+ get_regs_from_mc(®s, mc);
regs.is_user = 0;
unblock_signals();
timer_handler(SIGVTALRM, ®s);
diff --git a/arch/um/os-Linux/sys-x86/Makefile b/arch/um/os-Linux/sys-x86/Makefile
index 22cc507..253bfb8 100644
--- a/arch/um/os-Linux/sys-x86/Makefile
+++ b/arch/um/os-Linux/sys-x86/Makefile
@@ -3,7 +3,7 @@
# Licensed under the GPL
#
-obj-y = registers.o task_size.o
+obj-y = registers.o task_size.o mcontext.o
obj-$(CONFIG_X86_32) += tls.o
obj-$(CONFIG_64BIT) += prctl.o
diff --git a/arch/um/os-Linux/sys-x86/mcontext.c b/arch/um/os-Linux/sys-x86/mcontext.c
new file mode 100644
index 0000000..1d33d72
--- /dev/null
+++ b/arch/um/os-Linux/sys-x86/mcontext.c
@@ -0,0 +1,31 @@
+#include <sys/ucontext.h>
+#define __FRAME_OFFSETS
+#include <asm/ptrace.h>
+#include <sysdep/ptrace.h>
+
+void get_regs_from_mc(struct uml_pt_regs *regs, mcontext_t *mc)
+{
+#ifdef __i386__
+#define COPY2(X,Y) regs->gp[X] = mc->gregs[REG_##Y]
+#define COPY(X) regs->gp[X] = mc->gregs[REG_##X]
+#define COPY_SEG(X) regs->gp[X] = mc->gregs[REG_##X] & 0xffff;
+#define COPY_SEG_CPL3(X) regs->gp[X] = (mc->gregs[REG_##X] & 0xffff) | 3;
+ COPY_SEG(GS); COPY_SEG(FS); COPY_SEG(ES); COPY_SEG(DS);
+ COPY(EDI); COPY(ESI); COPY(EBP);
+ COPY2(UESP, ESP); /* sic */
+ COPY(EBX); COPY(EDX); COPY(ECX); COPY(EAX);
+ COPY(EIP); COPY_SEG_CPL3(CS); COPY(EFL); COPY_SEG_CPL3(SS);
+#else
+#define COPY2(X,Y) regs->gp[X/sizeof(unsigned long)] = mc->gregs[REG_##Y]
+#define COPY(X) regs->gp[X/sizeof(unsigned long)] = mc->gregs[REG_##X]
+ COPY(R8); COPY(R9); COPY(R10); COPY(R11);
+ COPY(R12); COPY(R13); COPY(R14); COPY(R15);
+ COPY(RDI); COPY(RSI); COPY(RBP); COPY(RBX);
+ COPY(RDX); COPY(RAX); COPY(RCX); COPY(RSP);
+ COPY(RIP);
+ COPY2(EFLAGS, EFL);
+ COPY2(CS, CSGSFS);
+ regs->gp[CS / sizeof(unsigned long)] &= 0xffff;
+ regs->gp[CS / sizeof(unsigned long)] |= 3;
+#endif
+}
diff --git a/arch/um/sys-x86/shared/sysdep/mcontext.h b/arch/um/sys-x86/shared/sysdep/mcontext.h
new file mode 100644
index 0000000..b724c54
--- /dev/null
+++ b/arch/um/sys-x86/shared/sysdep/mcontext.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SYS_SIGCONTEXT_X86_H
+#define __SYS_SIGCONTEXT_X86_H
+
+extern void get_regs_from_mc(struct uml_pt_regs *, mcontext_t *);
+
+#ifdef __i386__
+
+#define GET_FAULTINFO_FROM_MC(fi, mc) \
+ { \
+ (fi).cr2 = (mc)->cr2; \
+ (fi).error_code = (mc)->gregs[REG_ERR]; \
+ (fi).trap_no = (mc)->gregs[REG_TRAPNO]; \
+ }
+
+#else
+
+#define GET_FAULTINFO_FROM_MC(fi, mc) \
+ { \
+ (fi).cr2 = (mc)->gregs[REG_CR2]; \
+ (fi).error_code = (mc)->gregs[REG_ERR]; \
+ (fi).trap_no = (mc)->gregs[REG_TRAPNO]; \
+ }
+
+#endif
+
+#endif
diff --git a/arch/um/sys-x86/shared/sysdep/sigcontext.h b/arch/um/sys-x86/shared/sysdep/sigcontext.h
deleted file mode 100644
index f7f49f4..0000000
--- a/arch/um/sys-x86/shared/sysdep/sigcontext.h
+++ /dev/null
@@ -1,5 +0,0 @@
-#ifdef __i386__
-#include "sigcontext_32.h"
-#else
-#include "sigcontext_64.h"
-#endif
diff --git a/arch/um/sys-x86/shared/sysdep/sigcontext_32.h b/arch/um/sys-x86/shared/sysdep/sigcontext_32.h
deleted file mode 100644
index 548c3cd..0000000
--- a/arch/um/sys-x86/shared/sysdep/sigcontext_32.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#ifndef __SYS_SIGCONTEXT_I386_H
-#define __SYS_SIGCONTEXT_I386_H
-
-#include <generated/user_constants.h>
-
-#define SC_OFFSET(sc, field) \
- *((unsigned long *) &(((char *) (sc))[HOST_##field]))
-
-#define SC_TRAPNO(sc) SC_OFFSET(sc, SC_TRAPNO)
-#define SC_ERR(sc) SC_OFFSET(sc, SC_ERR)
-#define SC_CR2(sc) SC_OFFSET(sc, SC_CR2)
-
-#define GET_FAULTINFO_FROM_SC(fi, sc) \
- { \
- (fi).cr2 = SC_CR2(sc); \
- (fi).error_code = SC_ERR(sc); \
- (fi).trap_no = SC_TRAPNO(sc); \
- }
-
-#define GET_FAULTINFO_FROM_MC(fi, mc) \
- { \
- (fi).cr2 = (mc)->cr2; \
- (fi).error_code = (mc)->gregs[REG_ERR]; \
- (fi).trap_no = (mc)->gregs[REG_TRAPNO]; \
- }
-
-#endif
diff --git a/arch/um/sys-x86/shared/sysdep/sigcontext_64.h b/arch/um/sys-x86/shared/sysdep/sigcontext_64.h
deleted file mode 100644
index 5c4a6a3..0000000
--- a/arch/um/sys-x86/shared/sysdep/sigcontext_64.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Copyright 2003 PathScale, Inc.
- *
- * Licensed under the GPL
- */
-
-#ifndef __SYSDEP_X86_64_SIGCONTEXT_H
-#define __SYSDEP_X86_64_SIGCONTEXT_H
-
-#include <generated/user_constants.h>
-
-#define SC_OFFSET(sc, field) \
- *((unsigned long *) &(((char *) (sc))[HOST_##field]))
-#define SC_CR2(sc) SC_OFFSET(sc, SC_CR2)
-#define SC_ERR(sc) SC_OFFSET(sc, SC_ERR)
-#define SC_TRAPNO(sc) SC_OFFSET(sc, SC_TRAPNO)
-
-#define GET_FAULTINFO_FROM_SC(fi, sc) \
- { \
- (fi).cr2 = SC_CR2(sc); \
- (fi).error_code = SC_ERR(sc); \
- (fi).trap_no = SC_TRAPNO(sc); \
- }
-
-#define GET_FAULTINFO_FROM_MC(fi, mc) \
- { \
- (fi).cr2 = (mc)->gregs[REG_CR2]; \
- (fi).error_code = (mc)->gregs[REG_ERR]; \
- (fi).trap_no = (mc)->gregs[REG_TRAPNO]; \
- }
-
-#endif
diff --git a/arch/um/sys-x86/stub_segv.c b/arch/um/sys-x86/stub_segv.c
index bd2eaf6..b7450bd 100644
--- a/arch/um/sys-x86/stub_segv.c
+++ b/arch/um/sys-x86/stub_segv.c
@@ -5,7 +5,7 @@
#include "sysdep/stub.h"
#include "sysdep/faultinfo.h"
-#include "sysdep/sigcontext.h"
+#include "sysdep/mcontext.h"
void __attribute__ ((__section__ (".__syscall_stub")))
stub_segv_handler(int sig, siginfo_t *info, void *p)
diff --git a/arch/um/sys-x86/user-offsets.c b/arch/um/sys-x86/user-offsets.c
index 718f0c0..3c19c48 100644
--- a/arch/um/sys-x86/user-offsets.c
+++ b/arch/um/sys-x86/user-offsets.c
@@ -14,15 +14,8 @@
#define DEFINE_LONGS(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val/sizeof(unsigned long)))
-#define OFFSET(sym, str, mem) \
- DEFINE(sym, offsetof(struct str, mem));
-
void foo(void)
{
- OFFSET(HOST_SC_TRAPNO, sigcontext, trapno);
- OFFSET(HOST_SC_ERR, sigcontext, err);
- OFFSET(HOST_SC_CR2, sigcontext, cr2);
-
#ifdef __i386__
DEFINE_LONGS(HOST_FP_SIZE, sizeof(struct user_fpregs_struct));
DEFINE_LONGS(HOST_FPX_SIZE, sizeof(struct user_fpxregs_struct));
--
1.7.2.5
--
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