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authorChristoph Hellwig <hch@lst.de>2005-11-07 00:59:47 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 07:53:42 -0800
commit481bed454247538e9f57d4ea37b153ccba24ba7b (patch)
treebb4198296962c08dbf52e8f377dc27206f621640 /arch/sh64
parentdb73e9aa99bf093427b79877f9475392724fd5e5 (diff)
[PATCH] consolidate sys_ptrace()
The sys_ptrace boilerplate code (everything outside the big switch statement for the arch-specific requests) is shared by most architectures. This patch moves it to kernel/ptrace.c and leaves the arch-specific code as arch_ptrace. Some architectures have a too different ptrace so we have to exclude them. They continue to keep their implementations. For sh64 I had to add a sh64_ptrace wrapper because it does some initialization on the first call. For um I removed an ifdefed SUBARCH_PTRACE_SPECIAL block, but SUBARCH_PTRACE_SPECIAL isn't defined anywhere in the tree. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Paul Mackerras <paulus@samba.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Acked-By: David Howells <dhowells@redhat.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/sh64')
-rw-r--r--arch/sh64/kernel/ptrace.c83
-rw-r--r--arch/sh64/kernel/syscalls.S2
2 files changed, 28 insertions, 57 deletions
diff --git a/arch/sh64/kernel/ptrace.c b/arch/sh64/kernel/ptrace.c
index 71f2eec00b9..cd22e947131 100644
--- a/arch/sh64/kernel/ptrace.c
+++ b/arch/sh64/kernel/ptrace.c
@@ -28,6 +28,7 @@
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/signal.h>
+#include <linux/syscalls.h>
#include <asm/io.h>
#include <asm/uaccess.h>
@@ -121,61 +122,11 @@ put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
return 0;
}
-asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
+
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
- struct task_struct *child;
- extern void poke_real_address_q(unsigned long long addr, unsigned long long data);
-#define WPC_DBRMODE 0x0d104008
- static int first_call = 1;
int ret;
- lock_kernel();
-
- if (first_call) {
- /* Set WPC.DBRMODE to 0. This makes all debug events get
- * delivered through RESVEC, i.e. into the handlers in entry.S.
- * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
- * would normally be left set to 1, which makes debug events get
- * delivered through DBRVEC, i.e. into the remote gdb's
- * handlers. This prevents ptrace getting them, and confuses
- * the remote gdb.) */
- printk("DBRMODE set to 0 to permit native debugging\n");
- poke_real_address_q(WPC_DBRMODE, 0);
- first_call = 0;
- }
-
- ret = -EPERM;
- if (request == PTRACE_TRACEME) {
- /* are we already being traced? */
- if (current->ptrace & PT_PTRACED)
- goto out;
- /* set the ptrace bit in the process flags. */
- current->ptrace |= PT_PTRACED;
- ret = 0;
- goto out;
- }
- ret = -ESRCH;
- read_lock(&tasklist_lock);
- child = find_task_by_pid(pid);
- if (child)
- get_task_struct(child);
- read_unlock(&tasklist_lock);
- if (!child)
- goto out;
-
- ret = -EPERM;
- if (pid == 1) /* you may not mess with init */
- goto out_tsk;
-
- if (request == PTRACE_ATTACH) {
- ret = ptrace_attach(child);
- goto out_tsk;
- }
-
- ret = ptrace_check_attach(child, request == PTRACE_KILL);
- if (ret < 0)
- goto out_tsk;
-
switch (request) {
/* when I and D space are separate, these will need to be fixed. */
case PTRACE_PEEKTEXT: /* read word at location addr. */
@@ -313,13 +264,33 @@ asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
ret = ptrace_request(child, request, addr, data);
break;
}
-out_tsk:
- put_task_struct(child);
-out:
- unlock_kernel();
return ret;
}
+asmlinkage int sh64_ptrace(long request, long pid, long addr, long data)
+{
+ extern void poke_real_address_q(unsigned long long addr, unsigned long long data);
+#define WPC_DBRMODE 0x0d104008
+ static int first_call = 1;
+
+ lock_kernel();
+ if (first_call) {
+ /* Set WPC.DBRMODE to 0. This makes all debug events get
+ * delivered through RESVEC, i.e. into the handlers in entry.S.
+ * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
+ * would normally be left set to 1, which makes debug events get
+ * delivered through DBRVEC, i.e. into the remote gdb's
+ * handlers. This prevents ptrace getting them, and confuses
+ * the remote gdb.) */
+ printk("DBRMODE set to 0 to permit native debugging\n");
+ poke_real_address_q(WPC_DBRMODE, 0);
+ first_call = 0;
+ }
+ unlock_kernel();
+
+ return sys_ptrace(request, pid, addr, data);
+}
+
asmlinkage void syscall_trace(void)
{
struct task_struct *tsk = current;
diff --git a/arch/sh64/kernel/syscalls.S b/arch/sh64/kernel/syscalls.S
index a3d037805f1..c0079d54c85 100644
--- a/arch/sh64/kernel/syscalls.S
+++ b/arch/sh64/kernel/syscalls.S
@@ -46,7 +46,7 @@ sys_call_table:
.long sys_setuid16
.long sys_getuid16
.long sys_stime /* 25 */
- .long sys_ptrace
+ .long sh64_ptrace
.long sys_alarm
.long sys_fstat
.long sys_pause