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>
117 lines
2.4 KiB
C
117 lines
2.4 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <limits.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/utsname.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include "asm/types.h"
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#include <ctype.h>
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#include <signal.h>
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#include <wait.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <sched.h>
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#include <termios.h>
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#include <string.h>
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#include "user_util.h"
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#include "kern_util.h"
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#include "user.h"
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#include "mem_user.h"
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#include "init.h"
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#include "ptrace_user.h"
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#include "uml-config.h"
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#include "os.h"
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#include "longjmp.h"
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void stack_protections(unsigned long address)
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{
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int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
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if(mprotect((void *) address, page_size(), prot) < 0)
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panic("protecting stack failed, errno = %d", errno);
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}
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void task_protections(unsigned long address)
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{
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unsigned long guard = address + page_size();
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unsigned long stack = guard + page_size();
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int prot = 0, pages;
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#ifdef notdef
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if(mprotect((void *) stack, page_size(), prot) < 0)
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panic("protecting guard page failed, errno = %d", errno);
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#endif
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pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
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prot = PROT_READ | PROT_WRITE | PROT_EXEC;
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if(mprotect((void *) stack, pages * page_size(), prot) < 0)
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panic("protecting stack failed, errno = %d", errno);
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}
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int raw(int fd)
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{
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struct termios tt;
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int err;
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CATCH_EINTR(err = tcgetattr(fd, &tt));
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if(err < 0)
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return -errno;
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cfmakeraw(&tt);
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CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
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if(err < 0)
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return -errno;
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/* XXX tcsetattr could have applied only some changes
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* (and cfmakeraw() is a set of changes) */
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return(0);
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}
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void setup_machinename(char *machine_out)
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{
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struct utsname host;
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uname(&host);
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#if defined(UML_CONFIG_UML_X86) && !defined(UML_CONFIG_64BIT)
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if (!strcmp(host.machine, "x86_64")) {
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strcpy(machine_out, "i686");
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return;
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}
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#endif
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strcpy(machine_out, host.machine);
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}
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char host_info[(_UTSNAME_LENGTH + 1) * 4 + _UTSNAME_NODENAME_LENGTH + 1];
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void setup_hostinfo(void)
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{
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struct utsname host;
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uname(&host);
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sprintf(host_info, "%s %s %s %s %s", host.sysname, host.nodename,
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host.release, host.version, host.machine);
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}
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int setjmp_wrapper(void (*proc)(void *, void *), ...)
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{
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va_list args;
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jmp_buf buf;
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int n;
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n = UML_SETJMP(&buf);
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if(n == 0){
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va_start(args, proc);
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(*proc)(&buf, &args);
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}
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va_end(args);
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return n;
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}
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