13c06be399
This patch adds an implementation of setjmp and longjmp to UML, allowing access to the inside of a jmpbuf without needing the access macros formerly provided by libc. The implementation is stolen from klibc. I copy the relevant files into arch/um. I have another patch which avoids the copying, but requires klibc be in the tree. setjmp and longjmp users required some tweaking. Includes of <setjmp.h> were removed and includes of the UML longjmp.h were added where necessary. There are also replacements of siglongjmp with UML_LONGJMP which I somehow missed earlier. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
/*
|
|
* Copyright (C) 2004 PathScale, Inc
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include "ptrace_user.h"
|
|
#include "uml-config.h"
|
|
#include "skas_ptregs.h"
|
|
#include "registers.h"
|
|
#include "longjmp.h"
|
|
#include "user.h"
|
|
|
|
/* These are set once at boot time and not changed thereafter */
|
|
|
|
static unsigned long exec_regs[HOST_FRAME_SIZE];
|
|
static unsigned long exec_fp_regs[HOST_FP_SIZE];
|
|
|
|
void init_thread_registers(union uml_pt_regs *to)
|
|
{
|
|
memcpy(to->skas.regs, exec_regs, sizeof(to->skas.regs));
|
|
memcpy(to->skas.fp, exec_fp_regs, sizeof(to->skas.fp));
|
|
}
|
|
|
|
static int move_registers(int pid, int int_op, int fp_op,
|
|
union uml_pt_regs *regs)
|
|
{
|
|
if(ptrace(int_op, pid, 0, regs->skas.regs) < 0)
|
|
return(-errno);
|
|
|
|
if(ptrace(fp_op, pid, 0, regs->skas.fp) < 0)
|
|
return(-errno);
|
|
|
|
return(0);
|
|
}
|
|
|
|
void save_registers(int pid, union uml_pt_regs *regs)
|
|
{
|
|
int err;
|
|
|
|
err = move_registers(pid, PTRACE_GETREGS, PTRACE_GETFPREGS, regs);
|
|
if(err)
|
|
panic("save_registers - saving registers failed, errno = %d\n",
|
|
-err);
|
|
}
|
|
|
|
void restore_registers(int pid, union uml_pt_regs *regs)
|
|
{
|
|
int err;
|
|
|
|
err = move_registers(pid, PTRACE_SETREGS, PTRACE_SETFPREGS, regs);
|
|
if(err)
|
|
panic("restore_registers - saving registers failed, "
|
|
"errno = %d\n", -err);
|
|
}
|
|
|
|
void init_registers(int pid)
|
|
{
|
|
int err;
|
|
|
|
err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
|
|
if(err)
|
|
panic("check_ptrace : PTRACE_GETREGS failed, errno = %d",
|
|
errno);
|
|
|
|
err = ptrace(PTRACE_GETFPREGS, pid, 0, exec_fp_regs);
|
|
if(err)
|
|
panic("check_ptrace : PTRACE_GETFPREGS failed, errno = %d",
|
|
errno);
|
|
}
|
|
|
|
void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
|
|
{
|
|
memcpy(regs, exec_regs, HOST_FRAME_SIZE * sizeof(unsigned long));
|
|
if(fp_regs != NULL)
|
|
memcpy(fp_regs, exec_fp_regs,
|
|
HOST_FP_SIZE * sizeof(unsigned long));
|
|
}
|
|
|
|
void get_thread_regs(union uml_pt_regs *uml_regs, void *buffer)
|
|
{
|
|
struct __jmp_buf *jmpbuf = buffer;
|
|
|
|
UPT_SET(uml_regs, RIP, jmpbuf->__rip);
|
|
UPT_SET(uml_regs, RSP, jmpbuf->__rsp);
|
|
UPT_SET(uml_regs, RBP, jmpbuf->__rbp);
|
|
}
|