mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 03:35:36 +07:00
aa1a64ee12
On some systems, libc PAGE_SIZE calls getpagesize, which can't happen from a stub. So, I use UM_KERN_PAGE_SIZE, which is less variable in its definition, instead. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
#include <sched.h>
|
|
#include <signal.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/time.h>
|
|
#include <asm/unistd.h>
|
|
#include <asm/page.h>
|
|
#include "ptrace_user.h"
|
|
#include "skas.h"
|
|
#include "stub-data.h"
|
|
#include "uml-config.h"
|
|
#include "sysdep/stub.h"
|
|
#include "kern_constants.h"
|
|
|
|
/* This is in a separate file because it needs to be compiled with any
|
|
* extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
|
|
*
|
|
* Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
|
|
* on some systems.
|
|
*/
|
|
|
|
#define STUB_DATA(field) (((struct stub_data *) UML_CONFIG_STUB_DATA)->field)
|
|
|
|
void __attribute__ ((__section__ (".__syscall_stub")))
|
|
stub_clone_handler(void)
|
|
{
|
|
long err;
|
|
|
|
err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
|
|
UML_CONFIG_STUB_DATA + UM_KERN_PAGE_SIZE / 2 -
|
|
sizeof(void *));
|
|
if(err != 0)
|
|
goto out;
|
|
|
|
err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
|
|
if(err)
|
|
goto out;
|
|
|
|
err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL,
|
|
(long) &STUB_DATA(timer), 0);
|
|
if(err)
|
|
goto out;
|
|
|
|
err = stub_syscall6(STUB_MMAP_NR, UML_CONFIG_STUB_DATA,
|
|
UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
|
|
MAP_FIXED | MAP_SHARED, STUB_DATA(fd),
|
|
STUB_DATA(offset));
|
|
out:
|
|
/* save current result. Parent: pid; child: retcode of mmap */
|
|
STUB_DATA(err) = err;
|
|
trap_myself();
|
|
}
|