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-rw-r--r--arch/blackfin/kernel/ptrace.c118
1 files changed, 51 insertions, 67 deletions
diff --git a/arch/blackfin/kernel/ptrace.c b/arch/blackfin/kernel/ptrace.c
index 14118e40f18..9536c1e2d1c 100644
--- a/arch/blackfin/kernel/ptrace.c
+++ b/arch/blackfin/kernel/ptrace.c
@@ -25,7 +25,6 @@
#include <asm/cacheflush.h>
#include <asm/mem_map.h>
-#define TEXT_OFFSET 0
/*
* does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
@@ -43,7 +42,7 @@
* kernel stack will not be empty on entry to the kernel, so
* ptracing these tasks will fail.
*/
-static inline struct pt_regs *get_user_regs(struct task_struct *task)
+static inline struct pt_regs *task_pt_regs(struct task_struct *task)
{
return (struct pt_regs *)
((unsigned long)task_stack_page(task) +
@@ -56,7 +55,7 @@ static inline struct pt_regs *get_user_regs(struct task_struct *task)
static inline int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
{
struct pt_regs regs;
- memcpy(&regs, get_user_regs(tsk), sizeof(regs));
+ memcpy(&regs, task_pt_regs(tsk), sizeof(regs));
regs.usp = tsk->thread.usp;
return copy_to_user(uregs, &regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
}
@@ -69,40 +68,49 @@ static inline int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
/*
* Get contents of register REGNO in task TASK.
*/
-static inline long get_reg(struct task_struct *task, int regno)
+static inline long
+get_reg(struct task_struct *task, long regno, unsigned long __user *datap)
{
- unsigned char *reg_ptr;
+ long tmp;
+ struct pt_regs *regs = task_pt_regs(task);
- struct pt_regs *regs =
- (struct pt_regs *)((unsigned long)task_stack_page(task) +
- (THREAD_SIZE - sizeof(struct pt_regs)));
- reg_ptr = (char *)regs;
+ if (regno & 3 || regno > PT_LAST_PSEUDO || regno < 0)
+ return -EIO;
switch (regno) {
+ case PT_TEXT_ADDR:
+ tmp = task->mm->start_code;
+ break;
+ case PT_TEXT_END_ADDR:
+ tmp = task->mm->end_code;
+ break;
+ case PT_DATA_ADDR:
+ tmp = task->mm->start_data;
+ break;
case PT_USP:
- return task->thread.usp;
+ tmp = task->thread.usp;
+ break;
default:
- if (regno <= 216)
- return *(long *)(reg_ptr + regno);
+ if (regno < sizeof(*regs)) {
+ void *reg_ptr = regs;
+ tmp = *(long *)(reg_ptr + regno);
+ } else
+ return -EIO;
}
- /* slight mystery ... never seems to come here but kernel misbehaves without this code! */
- printk(KERN_WARNING "Request to get for unknown register %d\n", regno);
- return 0;
+ return put_user(tmp, datap);
}
/*
* Write contents of register REGNO in task TASK.
*/
static inline int
-put_reg(struct task_struct *task, int regno, unsigned long data)
+put_reg(struct task_struct *task, long regno, unsigned long data)
{
- char *reg_ptr;
+ struct pt_regs *regs = task_pt_regs(task);
- struct pt_regs *regs =
- (struct pt_regs *)((unsigned long)task_stack_page(task) +
- (THREAD_SIZE - sizeof(struct pt_regs)));
- reg_ptr = (char *)regs;
+ if (regno & 3 || regno > PT_LAST_PSEUDO || regno < 0)
+ return -EIO;
switch (regno) {
case PT_PC:
@@ -119,10 +127,18 @@ put_reg(struct task_struct *task, int regno, unsigned long data)
regs->usp = data;
task->thread.usp = data;
break;
+ case PT_SYSCFG: /* don't let userspace screw with this */
+ if ((data & ~1) != 0x6)
+ pr_warning("ptrace: ignore syscfg write of %#lx\n", data);
+ break; /* regs->syscfg = data; break; */
default:
- if (regno <= 216)
- *(long *)(reg_ptr + regno) = data;
+ if (regno < sizeof(*regs)) {
+ void *reg_offset = regs;
+ *(long *)(reg_offset + regno) = data;
+ }
+ /* Ignore writes to pseudo registers */
}
+
return 0;
}
@@ -231,40 +247,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
break;
}
- /* read the word at location addr in the USER area. */
- case PTRACE_PEEKUSR:
- {
- unsigned long tmp;
- ret = -EIO;
- tmp = 0;
- if ((addr & 3) || (addr > (sizeof(struct pt_regs) + 16))) {
- printk(KERN_WARNING "ptrace error : PEEKUSR : temporarily returning "
- "0 - %x sizeof(pt_regs) is %lx\n",
- (int)addr, sizeof(struct pt_regs));
- break;
- }
- if (addr == sizeof(struct pt_regs)) {
- /* PT_TEXT_ADDR */
- tmp = child->mm->start_code + TEXT_OFFSET;
- } else if (addr == (sizeof(struct pt_regs) + 4)) {
- /* PT_TEXT_END_ADDR */
- tmp = child->mm->end_code;
- } else if (addr == (sizeof(struct pt_regs) + 8)) {
- /* PT_DATA_ADDR */
- tmp = child->mm->start_data;
-#ifdef CONFIG_BINFMT_ELF_FDPIC
- } else if (addr == (sizeof(struct pt_regs) + 12)) {
- goto case_PTRACE_GETFDPIC_EXEC;
- } else if (addr == (sizeof(struct pt_regs) + 16)) {
- goto case_PTRACE_GETFDPIC_INTERP;
-#endif
- } else {
- tmp = get_reg(child, addr);
- }
- ret = put_user(tmp, datap);
- break;
- }
-
#ifdef CONFIG_BINFMT_ELF_FDPIC
case PTRACE_GETFDPIC: {
unsigned long tmp = 0;
@@ -327,19 +309,21 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
break;
}
- case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
- ret = -EIO;
- if ((addr & 3) || (addr > (sizeof(struct pt_regs) + 16))) {
- printk(KERN_WARNING "ptrace error : POKEUSR: temporarily returning 0\n");
- break;
+ case PTRACE_PEEKUSR:
+ switch (addr) {
+#ifdef CONFIG_BINFMT_ELF_FDPIC /* backwards compat */
+ case PT_FDPIC_EXEC: goto case_PTRACE_GETFDPIC_EXEC;
+ case PT_FDPIC_INTERP: goto case_PTRACE_GETFDPIC_INTERP;
+#endif
+ default:
+ ret = get_reg(child, addr, datap);
}
+ pr_debug("ptrace: PEEKUSR reg %li with %#lx = %i\n", addr, data, ret);
+ break;
- /* Ignore writes to SYSCFG and other pseudo regs */
- if (addr >= PT_SYSCFG) {
- ret = 0;
- break;
- }
+ case PTRACE_POKEUSR:
ret = put_reg(child, addr, data);
+ pr_debug("ptrace: POKEUSR reg %li with %li = %i\n", addr, data, ret);
break;
case PTRACE_GETREGS:
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-26 11:05:48 +0000