/*
* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
- * these modifications are Copyright 2004-2009 Analog Devices Inc.
+ * these modifications are Copyright 2004-2010 Analog Devices Inc.
*
* Licensed under the GPL-2
*/
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
+#include <linux/elf.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
+#include <linux/regset.h>
#include <linux/signal.h>
+#include <linux/tracehook.h>
#include <linux/uaccess.h>
#include <asm/page.h>
#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.
*/
-/* determines which bits in the SYSCFG reg the user has access to. */
-/* 1 = access 0 = no access */
-#define SYSCFG_MASK 0x0007 /* SYSCFG reg */
-/* sets the trace bits. */
-#define TRACE_BITS 0x0001
-
-/* Find the stack offset for a register, relative to thread.esp0. */
-#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
-
-/*
- * Get the address of the live pt_regs for the specified task.
- * These are saved onto the top kernel stack when the process
- * is not running.
- *
- * Note: if a user thread is execve'd from kernel space, the
- * 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)
-{
- return (struct pt_regs *)
- ((unsigned long)task_stack_page(task) +
- (THREAD_SIZE - sizeof(struct pt_regs)));
-}
-
-/*
- * Get all user integer registers.
- */
-static inline int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
-{
- struct pt_regs regs;
- memcpy(®s, get_user_regs(tsk), sizeof(regs));
- regs.usp = tsk->thread.usp;
- return copy_to_user(uregs, ®s, sizeof(struct pt_regs)) ? -EFAULT : 0;
-}
-
-/* Mapping from PT_xxx to the stack offset at which the register is
- * saved. Notice that usp has no stack-slot and needs to be treated
- * specially (see get_reg/put_reg below).
- */
-
/*
* 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:
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;
}
return -EIO;
}
-void ptrace_enable(struct task_struct *child)
+/*
+ * retrieve the contents of Blackfin userspace general registers
+ */
+static int genregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
{
- unsigned long tmp;
- tmp = get_reg(child, PT_SYSCFG) | (TRACE_BITS);
- put_reg(child, PT_SYSCFG, tmp);
+ struct pt_regs *regs = task_pt_regs(target);
+ int ret;
+
+ /* This sucks ... */
+ regs->usp = target->thread.usp;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs, 0, sizeof(*regs));
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ sizeof(*regs), -1);
}
/*
- * Called by kernel/ptrace.c when detaching..
- *
- * Make sure the single step bit is not set.
+ * update the contents of the Blackfin userspace general registers
+ */
+static int genregs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+ int ret;
+
+ /* Don't let people set SYSCFG (it's at the end of pt_regs) */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs, 0, PT_SYSCFG);
+ if (ret < 0)
+ return ret;
+
+ /* This sucks ... */
+ target->thread.usp = regs->usp;
+ /* regs->retx = regs->pc; */
+
+ return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ PT_SYSCFG, -1);
+}
+
+/*
+ * Define the register sets available on the Blackfin under Linux
*/
-void ptrace_disable(struct task_struct *child)
+enum bfin_regset {
+ REGSET_GENERAL,
+};
+
+static const struct user_regset bfin_regsets[] = {
+ [REGSET_GENERAL] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = sizeof(struct pt_regs) / sizeof(long),
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = genregs_get,
+ .set = genregs_set,
+ },
+};
+
+static const struct user_regset_view user_bfin_native_view = {
+ .name = "Blackfin",
+ .e_machine = EM_BLACKFIN,
+ .regsets = bfin_regsets,
+ .n = ARRAY_SIZE(bfin_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_bfin_native_view;
+}
+
+void user_enable_single_step(struct task_struct *child)
+{
+ struct pt_regs *regs = task_pt_regs(child);
+ regs->syscfg |= SYSCFG_SSSTEP;
+
+ set_tsk_thread_flag(child, TIF_SINGLESTEP);
+}
+
+void user_disable_single_step(struct task_struct *child)
{
- unsigned long tmp;
- /* make sure the single step bit is not set. */
- tmp = get_reg(child, PT_SYSCFG) & ~TRACE_BITS;
- put_reg(child, PT_SYSCFG, tmp);
+ struct pt_regs *regs = task_pt_regs(child);
+ regs->syscfg &= ~SYSCFG_SSSTEP;
+
+ clear_tsk_thread_flag(child, TIF_SINGLESTEP);
}
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;
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;
- }
-
- if (addr >= (sizeof(struct pt_regs))) {
- ret = 0;
- break;
- }
- if (addr == PT_SYSCFG) {
- data &= SYSCFG_MASK;
- data |= get_reg(child, PT_SYSCFG);
+ 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);
}
- ret = put_reg(child, addr, data);
+ pr_debug("ptrace: PEEKUSR reg %li with %#lx = %i\n", addr, data, ret);
break;
- case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
- case PTRACE_CONT: /* restart after signal. */
- pr_debug("ptrace: syscall/cont\n");
-
- ret = -EIO;
- if (!valid_signal(data))
- break;
- if (request == PTRACE_SYSCALL)
- set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- else
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- child->exit_code = data;
- ptrace_disable(child);
- pr_debug("ptrace: before wake_up_process\n");
- wake_up_process(child);
- ret = 0;
- break;
-
- /*
- * make the child exit. Best I can do is send it a sigkill.
- * perhaps it should be put in the status that it wants to
- * exit.
- */
- case PTRACE_KILL:
- ret = 0;
- if (child->exit_state == EXIT_ZOMBIE) /* already dead */
- break;
- child->exit_code = SIGKILL;
- ptrace_disable(child);
- wake_up_process(child);
- break;
-
- case PTRACE_SINGLESTEP: /* set the trap flag. */
- pr_debug("ptrace: single step\n");
- ret = -EIO;
- if (!valid_signal(data))
- break;
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- ptrace_enable(child);
- child->exit_code = data;
- wake_up_process(child);
- ret = 0;
+ 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:
- /* Get all gp regs from the child. */
- ret = ptrace_getregs(child, datap);
- break;
+ pr_debug("ptrace: PTRACE_GETREGS\n");
+ return copy_regset_to_user(child, &user_bfin_native_view,
+ REGSET_GENERAL,
+ 0, sizeof(struct pt_regs),
+ (void __user *)data);
case PTRACE_SETREGS:
- printk(KERN_WARNING "ptrace: SETREGS: **** NOT IMPLEMENTED ***\n");
- /* Set all gp regs in the child. */
- ret = 0;
- break;
+ pr_debug("ptrace: PTRACE_SETREGS\n");
+ return copy_regset_from_user(child, &user_bfin_native_view,
+ REGSET_GENERAL,
+ 0, sizeof(struct pt_regs),
+ (const void __user *)data);
default:
ret = ptrace_request(child, request, addr, data);
return ret;
}
-asmlinkage void syscall_trace(void)
+asmlinkage int syscall_trace_enter(struct pt_regs *regs)
{
- if (!test_thread_flag(TIF_SYSCALL_TRACE))
- return;
-
- if (!(current->ptrace & PT_PTRACED))
- return;
-
- /* the 0x80 provides a way for the tracing parent to distinguish
- * between a syscall stop and SIGTRAP delivery
- */
- ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
- ? 0x80 : 0));
-
- /*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
- */
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
+ int ret = 0;
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ ret = tracehook_report_syscall_entry(regs);
+
+ return ret;
+}
+
+asmlinkage void syscall_trace_leave(struct pt_regs *regs)
+{
+ int step;
+
+ step = test_thread_flag(TIF_SINGLESTEP);
+ if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(regs, step);
}
git.openpandora.org / pandora-kernel.git / blobdiff