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path: root/arch/um/kernel/skas/mem_user.c
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Diffstat (limited to 'arch/um/kernel/skas/mem_user.c')
-rw-r--r--arch/um/kernel/skas/mem_user.c224
1 files changed, 166 insertions, 58 deletions
diff --git a/arch/um/kernel/skas/mem_user.c b/arch/um/kernel/skas/mem_user.c
index b0980ff3bd9..1d89640bd50 100644
--- a/arch/um/kernel/skas/mem_user.c
+++ b/arch/um/kernel/skas/mem_user.c
@@ -5,13 +5,14 @@
#include <signal.h>
#include <errno.h>
+#include <string.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <asm/page.h>
#include <asm/unistd.h>
#include "mem_user.h"
#include "mem.h"
-#include "mm_id.h"
+#include "skas.h"
#include "user.h"
#include "os.h"
#include "proc_mm.h"
@@ -23,46 +24,155 @@
#include "uml-config.h"
#include "sysdep/ptrace.h"
#include "sysdep/stub.h"
-#include "skas.h"
-extern unsigned long syscall_stub, __syscall_stub_start;
+extern unsigned long batch_syscall_stub, __syscall_stub_start;
extern void wait_stub_done(int pid, int sig, char * fname);
-static long run_syscall_stub(struct mm_id * mm_idp, int syscall,
- unsigned long *args)
+static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
+ unsigned long *stack)
+{
+ if(stack == NULL){
+ stack = (unsigned long *) mm_idp->stack + 2;
+ *stack = 0;
+ }
+ return stack;
+}
+
+extern int proc_mm;
+
+int single_count = 0;
+int multi_count = 0;
+int multi_op_count = 0;
+
+static long do_syscall_stub(struct mm_id *mm_idp, void **addr)
{
+ unsigned long regs[MAX_REG_NR];
+ unsigned long *data;
+ unsigned long *syscall;
+ long ret, offset;
int n, pid = mm_idp->u.pid;
- unsigned long regs[MAX_REG_NR];
+
+ if(proc_mm)
+#warning Need to look up userspace_pid by cpu
+ pid = userspace_pid[0];
+
+ multi_count++;
get_safe_registers(regs);
regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
- ((unsigned long) &syscall_stub -
+ ((unsigned long) &batch_syscall_stub -
(unsigned long) &__syscall_stub_start);
- /* XXX Don't have a define for starting a syscall */
- regs[REGS_SYSCALL_NR] = syscall;
- regs[REGS_SYSCALL_ARG1] = args[0];
- regs[REGS_SYSCALL_ARG2] = args[1];
- regs[REGS_SYSCALL_ARG3] = args[2];
- regs[REGS_SYSCALL_ARG4] = args[3];
- regs[REGS_SYSCALL_ARG5] = args[4];
- regs[REGS_SYSCALL_ARG6] = args[5];
- n = ptrace_setregs(pid, regs);
- if(n < 0){
- printk("run_syscall_stub : PTRACE_SETREGS failed, "
- "errno = %d\n", n);
- return(n);
+ n = ptrace_setregs(pid, regs);
+ if(n < 0)
+ panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
+ n);
+
+ wait_stub_done(pid, 0, "do_syscall_stub");
+
+ /* When the stub stops, we find the following values on the
+ * beginning of the stack:
+ * (long )return_value
+ * (long )offset to failed sycall-data (0, if no error)
+ */
+ 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);
+ syscall = (unsigned long *)((unsigned long)data + data[0]);
+ printk("do_syscall_stub: syscall %ld failed, return value = "
+ "0x%lx, expected return value = 0x%lx\n",
+ syscall[0], ret, syscall[7]);
+ printk(" syscall parameters: "
+ "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
+ syscall[1], syscall[2], syscall[3],
+ syscall[4], syscall[5], syscall[6]);
+ for(n = 1; n < data[0]/sizeof(long); n++) {
+ if(n == 1)
+ printk(" additional syscall data:");
+ if(n % 4 == 1)
+ printk("\n ");
+ printk(" 0x%lx", data[n]);
+ }
+ if(n > 1)
+ printk("\n");
+ }
+ else ret = 0;
+
+ *addr = check_init_stack(mm_idp, NULL);
+
+ return ret;
+}
+
+long run_syscall_stub(struct mm_id * mm_idp, int syscall,
+ unsigned long *args, long expected, void **addr,
+ int done)
+{
+ unsigned long *stack = check_init_stack(mm_idp, *addr);
+
+ if(done && *addr == NULL)
+ single_count++;
+
+ *stack += sizeof(long);
+ stack += *stack / sizeof(long);
+
+ *stack++ = syscall;
+ *stack++ = args[0];
+ *stack++ = args[1];
+ *stack++ = args[2];
+ *stack++ = args[3];
+ *stack++ = args[4];
+ *stack++ = args[5];
+ *stack++ = expected;
+ *stack = 0;
+ multi_op_count++;
+
+ if(!done && ((((unsigned long) stack) & ~PAGE_MASK) <
+ PAGE_SIZE - 10 * sizeof(long))){
+ *addr = stack;
+ return 0;
}
- wait_stub_done(pid, 0, "run_syscall_stub");
+ return do_syscall_stub(mm_idp, addr);
+}
+
+long syscall_stub_data(struct mm_id * mm_idp,
+ unsigned long *data, int data_count,
+ void **addr, void **stub_addr)
+{
+ unsigned long *stack;
+ int ret = 0;
- return(*((unsigned long *) mm_idp->stack));
+ /* If *addr still is uninitialized, it *must* contain NULL.
+ * Thus in this case do_syscall_stub correctly won't be called.
+ */
+ if((((unsigned long) *addr) & ~PAGE_MASK) >=
+ PAGE_SIZE - (10 + data_count) * sizeof(long)) {
+ ret = do_syscall_stub(mm_idp, addr);
+ /* in case of error, don't overwrite data on stack */
+ if(ret)
+ return ret;
+ }
+
+ stack = check_init_stack(mm_idp, *addr);
+ *addr = stack;
+
+ *stack = data_count * sizeof(long);
+
+ memcpy(stack + 1, data, data_count * sizeof(long));
+
+ *stub_addr = (void *)(((unsigned long)(stack + 1) & ~PAGE_MASK) +
+ UML_CONFIG_STUB_DATA);
+
+ return 0;
}
-int map(struct mm_id *mm_idp, unsigned long virt, unsigned long len,
- int r, int w, int x, int phys_fd, unsigned long long offset)
+int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len,
+ int r, int w, int x, int phys_fd, unsigned long long offset,
+ int done, void **data)
{
- int prot, n;
+ int prot, ret;
prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
(x ? PROT_EXEC : 0);
@@ -70,6 +180,7 @@ int map(struct mm_id *mm_idp, unsigned long virt, unsigned long len,
if(proc_mm){
struct proc_mm_op map;
int fd = mm_idp->u.mm_fd;
+
map = ((struct proc_mm_op) { .op = MM_MMAP,
.u =
{ .mmap =
@@ -81,63 +192,61 @@ int map(struct mm_id *mm_idp, unsigned long virt, unsigned long len,
.fd = phys_fd,
.offset= offset
} } } );
- n = os_write_file(fd, &map, sizeof(map));
- if(n != sizeof(map))
- printk("map : /proc/mm map failed, err = %d\n", -n);
+ ret = os_write_file(fd, &map, sizeof(map));
+ if(ret != sizeof(map))
+ printk("map : /proc/mm map failed, err = %d\n", -ret);
+ else ret = 0;
}
else {
- long res;
unsigned long args[] = { virt, len, prot,
MAP_SHARED | MAP_FIXED, phys_fd,
MMAP_OFFSET(offset) };
- res = run_syscall_stub(mm_idp, STUB_MMAP_NR, args);
- if((void *) res == MAP_FAILED)
- printk("mmap stub failed, errno = %d\n", res);
+ ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
+ data, done);
}
- return 0;
+ return ret;
}
-int unmap(struct mm_id *mm_idp, void *addr, unsigned long len)
+int unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done,
+ void **data)
{
- int n;
+ int ret;
if(proc_mm){
struct proc_mm_op unmap;
int fd = mm_idp->u.mm_fd;
+
unmap = ((struct proc_mm_op) { .op = MM_MUNMAP,
.u =
{ .munmap =
{ .addr =
(unsigned long) addr,
.len = len } } } );
- n = os_write_file(fd, &unmap, sizeof(unmap));
- if(n != sizeof(unmap)) {
- if(n < 0)
- return(n);
- else if(n > 0)
- return(-EIO);
- }
+ ret = os_write_file(fd, &unmap, sizeof(unmap));
+ if(ret != sizeof(unmap))
+ printk("unmap - proc_mm write returned %d\n", ret);
+ else ret = 0;
}
else {
- int res;
unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
0 };
- res = run_syscall_stub(mm_idp, __NR_munmap, args);
- if(res < 0)
- printk("munmap stub failed, errno = %d\n", res);
+ ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
+ data, done);
+ if(ret < 0)
+ printk("munmap stub failed, errno = %d\n", ret);
}
- return(0);
+ return ret;
}
-int protect(struct mm_id *mm_idp, unsigned long addr, unsigned long len,
- int r, int w, int x)
+int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
+ int r, int w, int x, int done, void **data)
{
struct proc_mm_op protect;
- int prot, n;
+ int prot, ret;
prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
(x ? PROT_EXEC : 0);
@@ -152,20 +261,19 @@ int protect(struct mm_id *mm_idp, unsigned long addr, unsigned long len,
.len = len,
.prot = prot } } } );
- n = os_write_file(fd, &protect, sizeof(protect));
- if(n != sizeof(protect))
- panic("protect failed, err = %d", -n);
+ ret = os_write_file(fd, &protect, sizeof(protect));
+ if(ret != sizeof(protect))
+ printk("protect failed, err = %d", -ret);
+ else ret = 0;
}
else {
- int res;
unsigned long args[] = { addr, len, prot, 0, 0, 0 };
- res = run_syscall_stub(mm_idp, __NR_mprotect, args);
- if(res < 0)
- panic("mprotect stub failed, errno = %d\n", res);
+ ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
+ data, done);
}
- return(0);
+ return ret;
}
void before_mem_skas(unsigned long unused)
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-03 22:58:19 +0000