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um: finish conversion to mcontext_t

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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@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Al Viro 2011-08-18 20:05:19 +01:00 committed by Richard Weinberger
parent 248b74c79e
commit ab1c0cc7c9
9 changed files with 67 additions and 81 deletions
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6
arch/um/os-Linux/signal.c
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@ -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(&regs, (struct sigcontext *)mc);
get_regs_from_mc(&regs, mc);
regs.is_user = 0;
unblock_signals();
timer_handler(SIGVTALRM, &regs);

2
arch/um/os-Linux/sys-x86/Makefile
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@ -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

31
arch/um/os-Linux/sys-x86/mcontext.c Normal file
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@ -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
}

31
arch/um/sys-x86/shared/sysdep/mcontext.h Normal file
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@ -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

5
arch/um/sys-x86/shared/sysdep/sigcontext.h
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@ -1,5 +0,0 @@
#ifdef __i386__
#include "sigcontext_32.h"
#else
#include "sigcontext_64.h"
#endif

32
arch/um/sys-x86/shared/sysdep/sigcontext_32.h
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@ -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

32
arch/um/sys-x86/shared/sysdep/sigcontext_64.h
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@ -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

2
arch/um/sys-x86/stub_segv.c
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@ -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)

7
arch/um/sys-x86/user-offsets.c
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@ -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));