提交 ab1c0cc7 编写于 作者: A Al Viro 提交者: Richard Weinberger

um: finish conversion to mcontext_t

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: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NRichard Weinberger <richard@nod.at>
上级 248b74c7
......@@ -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);
......
......@@ -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
......
#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
}
......@@ -3,30 +3,29 @@
* Licensed under the GPL
*/
#ifndef __SYS_SIGCONTEXT_I386_H
#define __SYS_SIGCONTEXT_I386_H
#ifndef __SYS_SIGCONTEXT_X86_H
#define __SYS_SIGCONTEXT_X86_H
#include <generated/user_constants.h>
extern void get_regs_from_mc(struct uml_pt_regs *, mcontext_t *);
#define SC_OFFSET(sc, field) \
*((unsigned long *) &(((char *) (sc))[HOST_##field]))
#ifdef __i386__
#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) \
#define GET_FAULTINFO_FROM_MC(fi, mc) \
{ \
(fi).cr2 = SC_CR2(sc); \
(fi).error_code = SC_ERR(sc); \
(fi).trap_no = SC_TRAPNO(sc); \
(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)->cr2; \
(fi).cr2 = (mc)->gregs[REG_CR2]; \
(fi).error_code = (mc)->gregs[REG_ERR]; \
(fi).trap_no = (mc)->gregs[REG_TRAPNO]; \
}
#endif
#endif
#ifdef __i386__
#include "sigcontext_32.h"
#else
#include "sigcontext_64.h"
#endif
/*
* 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
......@@ -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)
......
......@@ -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));
......
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