However, this it experimental on 32-bit architectures, so if unsure say
N (on x86-64 it's automatically enabled, instead, as it's safe there).
-config STUB_CODE
- hex
- default 0xbfffe000 if !HOST_VMSPLIT_2G
- default 0x7fffe000 if HOST_VMSPLIT_2G
-
-config STUB_DATA
- hex
- default 0xbffff000 if !HOST_VMSPLIT_2G
- default 0x7ffff000 if HOST_VMSPLIT_2G
-
-config STUB_START
- hex
- default STUB_CODE
-
config ARCH_HAS_SC_SIGNALS
bool
default y
config TOP_ADDR
hex
- default 0x80000000
+ default 0x7fc0000000
config 3_LEVEL_PGTABLES
bool
default y
-config STUB_CODE
- hex
- default 0x7fbfffe000
-
-config STUB_DATA
- hex
- default 0x7fbffff000
-
-config STUB_START
- hex
- default STUB_CODE
-
config ARCH_HAS_SC_SIGNALS
bool
default n
# CONFIG_HOST_2G_2G is not set
CONFIG_TOP_ADDR=0xc0000000
# CONFIG_3_LEVEL_PGTABLES is not set
-CONFIG_STUB_CODE=0xbfffe000
-CONFIG_STUB_DATA=0xbffff000
-CONFIG_STUB_START=0xbfffe000
CONFIG_ARCH_HAS_SC_SIGNALS=y
CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA=y
CONFIG_GENERIC_HWEIGHT=y
#ifndef __START_H__
#define __START_H__
+#include "uml-config.h"
+#include "kern_constants.h"
+
+/*
+ * Assembly doesn't want any casting, but C does, so define these
+ * without casts here, and define new symbols with casts inside the C
+ * section.
+ */
+#define ASM_STUB_CODE (UML_CONFIG_TOP_ADDR - 2 * UM_KERN_PAGE_SIZE)
+#define ASM_STUB_DATA (UML_CONFIG_TOP_ADDR - UM_KERN_PAGE_SIZE)
+#define ASM_STUB_START ASM_STUB_CODE
+
+/*
+ * This file is included by the assembly stubs, which just want the
+ * definitions above.
+ */
+#ifndef __ASSEMBLY__
+
+#define STUB_CODE ((unsigned long) ASM_STUB_CODE)
+#define STUB_DATA ((unsigned long) ASM_STUB_DATA)
+#define STUB_START ((unsigned long) ASM_STUB_START)
+
#include "sysdep/ptrace.h"
struct cpu_task {
extern void (*sig_info[])(int, struct uml_pt_regs *);
#endif
+
+#endif
#include <sys/mman.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>
+#include "as-layout.h"
#include "stub-data.h"
#include "kern_constants.h"
#include "uml-config.h"
{
__asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;"
"movl %7, %%ebx ; movl %%eax, (%%ebx)"
- : : "g" (STUB_MMAP_NR), "b" (UML_CONFIG_STUB_DATA),
- "c" (UM_KERN_PAGE_SIZE),
+ : : "g" (STUB_MMAP_NR), "b" (STUB_DATA),
+ "c" (UM_KERN_PAGE_SIZE),
"d" (PROT_READ | PROT_WRITE),
- "S" (MAP_FIXED | MAP_SHARED), "D" (fd),
- "a" (offset),
- "i" (&((struct stub_data *) UML_CONFIG_STUB_DATA)->err)
+ "S" (MAP_FIXED | MAP_SHARED), "D" (fd),
+ "a" (offset),
+ "i" (&((struct stub_data *) STUB_DATA)->err)
: "memory");
}
#include <sys/mman.h>
#include <asm/unistd.h>
#include <sysdep/ptrace_user.h>
+#include "as-layout.h"
#include "stub-data.h"
#include "kern_constants.h"
#include "uml-config.h"
{
__asm__ volatile ("movq %4,%%r10 ; movq %5,%%r8 ; "
"movq %6, %%r9; " __syscall "; movq %7, %%rbx ; "
- "movq %%rax, (%%rbx)":
- : "a" (STUB_MMAP_NR), "D" (UML_CONFIG_STUB_DATA),
- "S" (UM_KERN_PAGE_SIZE),
- "d" (PROT_READ | PROT_WRITE),
- "g" (MAP_FIXED | MAP_SHARED), "g" (fd),
+ "movq %%rax, (%%rbx)":
+ : "a" (STUB_MMAP_NR), "D" (STUB_DATA),
+ "S" (UM_KERN_PAGE_SIZE),
+ "d" (PROT_READ | PROT_WRITE),
+ "g" (MAP_FIXED | MAP_SHARED), "g" (fd),
"g" (offset),
- "i" (&((struct stub_data *) UML_CONFIG_STUB_DATA)->err)
+ "i" (&((struct stub_data *) STUB_DATA)->err)
: __syscall_clobber, "r10", "r8", "r9" );
}
#include "asm/current.h"
#include "asm/processor.h"
#include "asm/uaccess.h"
+#include "as-layout.h"
#include "mem_user.h"
#include "skas.h"
#include "os.h"
void flush_thread(void)
{
void *data = NULL;
- unsigned long end = proc_mm ? task_size : CONFIG_STUB_START;
+ unsigned long end = proc_mm ? task_size : STUB_START;
int ret;
arch_flush_thread(¤t->thread.arch);
#include <sys/time.h>
#include <asm/unistd.h>
#include <asm/page.h>
+#include "as-layout.h"
#include "ptrace_user.h"
#include "skas.h"
#include "stub-data.h"
void __attribute__ ((__section__ (".__syscall_stub")))
stub_clone_handler(void)
{
- struct stub_data *data = (struct stub_data *) UML_CONFIG_STUB_DATA;
+ struct stub_data *data = (struct stub_data *) STUB_DATA;
long err;
err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
- UML_CONFIG_STUB_DATA + UM_KERN_PAGE_SIZE / 2 -
- sizeof(void *));
+ STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
if(err != 0)
goto out;
#include "linux/sched.h"
#include "asm/pgalloc.h"
#include "asm/pgtable.h"
+#include "as-layout.h"
#include "os.h"
#include "skas.h"
*/
mm->pgd[USER_PTRS_PER_PGD] = __pgd(0);
- ret = init_stub_pte(mm, CONFIG_STUB_CODE,
+ ret = init_stub_pte(mm, STUB_CODE,
(unsigned long) &__syscall_stub_start);
if (ret)
goto out_free;
- ret = init_stub_pte(mm, CONFIG_STUB_DATA, stack);
+ ret = init_stub_pte(mm, STUB_DATA, stack);
if (ret)
goto out_free;
return fd;
if (skas_needs_stub)
- map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack);
+ map_stub_pages(fd, STUB_CODE, STUB_DATA, stack);
return fd;
}
static void fix_range(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force)
{
- if (!proc_mm && (end_addr > CONFIG_STUB_START))
- end_addr = CONFIG_STUB_START;
+ if (!proc_mm && (end_addr > STUB_START))
+ end_addr = STUB_START;
fix_range_common(mm, start_addr, end_addr, force);
}
if (atomic_read(&mm->mm_users) == 0)
return;
- end = proc_mm ? task_size : CONFIG_STUB_START;
+ end = proc_mm ? task_size : STUB_START;
fix_range(mm, 0, end, 0);
}
if (!skas_needs_stub)
*task_size_out = host_task_size;
- else *task_size_out = CONFIG_STUB_START & PGDIR_MASK;
+ else
+ *task_size_out = STUB_START & PGDIR_MASK;
return host_task_size;
}
#include <sys/mman.h>
#include "init.h"
#include "kern_constants.h"
+#include "as-layout.h"
#include "mm_id.h"
#include "os.h"
#include "proc_mm.h"
static int __init init_syscall_regs(void)
{
get_safe_registers(syscall_regs);
- syscall_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
+ syscall_regs[REGS_IP_INDEX] = STUB_CODE +
((unsigned long) &batch_syscall_stub -
(unsigned long) &__syscall_stub_start);
return 0;
ret = *((unsigned long *) mm_idp->stack);
offset = *((unsigned long *) mm_idp->stack + 1);
if (offset) {
- data = (unsigned long *)(mm_idp->stack +
- offset - UML_CONFIG_STUB_DATA);
+ data = (unsigned long *)(mm_idp->stack + offset - STUB_DATA);
printk(UM_KERN_ERR "do_syscall_stub : ret = %ld, offset = %ld, "
"data = %p\n", ret, offset, data);
syscall = (unsigned long *)((unsigned long)data + data[0]);
memcpy(stack + 1, data, data_count * sizeof(long));
*stub_addr = (void *)(((unsigned long)(stack + 1) &
- ~UM_KERN_PAGE_MASK) + UML_CONFIG_STUB_DATA);
+ ~UM_KERN_PAGE_MASK) + STUB_DATA);
return 0;
}
int fd;
unsigned long long offset;
fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
- addr = mmap64((void *) UML_CONFIG_STUB_CODE, UM_KERN_PAGE_SIZE,
+ addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
if (addr == MAP_FAILED) {
- printk(UM_KERN_ERR "mapping mmap stub failed, "
- "errno = %d\n", errno);
+ printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
+ "errno = %d\n", STUB_CODE, errno);
exit(1);
}
if (stack != NULL) {
fd = phys_mapping(to_phys(stack), &offset);
- addr = mmap((void *) UML_CONFIG_STUB_DATA,
+ addr = mmap((void *) STUB_DATA,
UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED, fd, offset);
if (addr == MAP_FAILED) {
printk(UM_KERN_ERR "mapping segfault stack "
- "failed, errno = %d\n", errno);
+ "at 0x%lx failed, errno = %d\n",
+ STUB_DATA, errno);
exit(1);
}
}
if (!ptrace_faultinfo && (stack != NULL)) {
struct sigaction sa;
- unsigned long v = UML_CONFIG_STUB_CODE +
+ unsigned long v = STUB_CODE +
(unsigned long) stub_segv_handler -
(unsigned long) &__syscall_stub_start;
- set_sigstack((void *) UML_CONFIG_STUB_DATA, UM_KERN_PAGE_SIZE);
+ set_sigstack((void *) STUB_DATA, UM_KERN_PAGE_SIZE);
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGIO);
sigaddset(&sa.sa_mask, SIGWINCH);
{
get_safe_registers(thread_regs);
/* Set parent's instruction pointer to start of clone-stub */
- thread_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
+ thread_regs[REGS_IP_INDEX] = STUB_CODE +
(unsigned long) stub_clone_handler -
(unsigned long) &__syscall_stub_start;
- thread_regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + UM_KERN_PAGE_SIZE -
+ thread_regs[REGS_SP_INDEX] = STUB_DATA + UM_KERN_PAGE_SIZE -
sizeof(void *);
#ifdef __SIGNAL_FRAMESIZE
thread_regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
* child's stack and check it.
*/
wait_stub_done(pid);
- if (child_data->err != UML_CONFIG_STUB_DATA)
+ if (child_data->err != STUB_DATA)
panic("copy_context_skas0 - stub-child reports error %ld\n",
child_data->err);
#include "uml-config.h"
+#include "as-layout.h"
.globl syscall_stub
.section .__syscall_stub, "x"
.globl batch_syscall_stub
batch_syscall_stub:
/* load pointer to first operation */
- mov $(UML_CONFIG_STUB_DATA+8), %esp
+ mov $(ASM_STUB_DATA+8), %esp
again:
/* load length of additional data */
/* if(length == 0) : end of list */
/* write possible 0 to header */
- mov %eax, UML_CONFIG_STUB_DATA+4
+ mov %eax, ASM_STUB_DATA+4
cmpl $0, %eax
jz done
/* save current pointer */
- mov %esp, UML_CONFIG_STUB_DATA+4
+ mov %esp, ASM_STUB_DATA+4
/* skip additional data */
add %eax, %esp
done:
/* save return value */
- mov %eax, UML_CONFIG_STUB_DATA
+ mov %eax, ASM_STUB_DATA
/* stop */
int3
#include <signal.h>
#include <sys/select.h> /* The only way I can see to get sigset_t */
#include <asm/unistd.h>
+#include "as-layout.h"
#include "uml-config.h"
#include "sysdep/stub.h"
#include "sysdep/sigcontext.h"
struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
int pid;
- GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
- sc);
+ GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA), sc);
pid = stub_syscall0(__NR_getpid);
stub_syscall2(__NR_kill, pid, SIGUSR1);
#include "uml-config.h"
+#include "as-layout.h"
.globl syscall_stub
.section .__syscall_stub, "x"
/* We don't have 64-bit constants, so this constructs the address
* we need.
*/
- movq $(UML_CONFIG_STUB_DATA >> 32), %rbx
+ movq $(ASM_STUB_DATA >> 32), %rbx
salq $32, %rbx
- movq $(UML_CONFIG_STUB_DATA & 0xffffffff), %rcx
+ movq $(ASM_STUB_DATA & 0xffffffff), %rcx
or %rcx, %rbx
movq %rax, (%rbx)
int3
.globl batch_syscall_stub
batch_syscall_stub:
- mov $(UML_CONFIG_STUB_DATA >> 32), %rbx
+ mov $(ASM_STUB_DATA >> 32), %rbx
sal $32, %rbx
- mov $(UML_CONFIG_STUB_DATA & 0xffffffff), %rax
+ mov $(ASM_STUB_DATA & 0xffffffff), %rax
or %rax, %rbx
/* load pointer to first operation */
mov %rbx, %rsp
#include <stddef.h>
#include <signal.h>
#include <asm/unistd.h>
+#include "as-layout.h"
#include "uml-config.h"
#include "sysdep/sigcontext.h"
#include "sysdep/faultinfo.h"
int pid;
__asm__ __volatile__("movq %%rdx, %0" : "=g" (uc) :);
- GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
+ GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA),
&uc->uc_mcontext);
pid = stub_syscall0(__NR_getpid);