#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
+#include <linux/regset.h>
+#include <linux/elf.h>
+#include <linux/tracehook.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/system.h>
((unsigned long) task->thread.uregs + offset);
}
-/*
- * this routine will put a word on the processes privileged stack.
- * the offset is how far from the base addr as stored in the TSS.
- * this routine assumes that all the privileged stacks are in our
- * data space.
- */
static inline
int put_stack_long(struct task_struct *task, int offset, unsigned long data)
{
return 0;
}
-static inline unsigned long get_fpregs(struct fpu_state_struct *buf,
- struct task_struct *tsk)
+/*
+ * retrieve the contents of MN10300 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)
{
- return __copy_to_user(buf, &tsk->thread.fpu_state,
- sizeof(struct fpu_state_struct));
+ const struct pt_regs *regs = task_pt_regs(target);
+ int ret;
+
+ /* we need to skip regs->next */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs, 0, PT_ORIG_D0 * sizeof(long));
+ if (ret < 0)
+ return ret;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ ®s->orig_d0, PT_ORIG_D0 * sizeof(long),
+ NR_PTREGS * sizeof(long));
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ NR_PTREGS * sizeof(long), -1);
}
-static inline unsigned long set_fpregs(struct task_struct *tsk,
- struct fpu_state_struct *buf)
+/*
+ * update the contents of the MN10300 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)
{
- return __copy_from_user(&tsk->thread.fpu_state, buf,
- sizeof(struct fpu_state_struct));
+ struct pt_regs *regs = task_pt_regs(target);
+ unsigned long tmp;
+ int ret;
+
+ /* we need to skip regs->next */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs, 0, PT_ORIG_D0 * sizeof(long));
+ if (ret < 0)
+ return ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ ®s->orig_d0, PT_ORIG_D0 * sizeof(long),
+ PT_EPSW * sizeof(long));
+ if (ret < 0)
+ return ret;
+
+ /* we need to mask off changes to EPSW */
+ tmp = regs->epsw;
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &tmp, PT_EPSW * sizeof(long),
+ PT_PC * sizeof(long));
+ tmp &= EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N | EPSW_FLAG_Z;
+ tmp |= regs->epsw & ~(EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N |
+ EPSW_FLAG_Z);
+ regs->epsw = tmp;
+
+ if (ret < 0)
+ return ret;
+
+ /* and finally load the PC */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ ®s->pc, PT_PC * sizeof(long),
+ NR_PTREGS * sizeof(long));
+
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ NR_PTREGS * sizeof(long), -1);
}
-static inline void fpsave_init(struct task_struct *task)
+/*
+ * retrieve the contents of MN10300 userspace FPU registers
+ */
+static int fpuregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
{
- memset(&task->thread.fpu_state, 0, sizeof(struct fpu_state_struct));
+ const struct fpu_state_struct *fpregs = &target->thread.fpu_state;
+ int ret;
+
+ unlazy_fpu(target);
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ fpregs, 0, sizeof(*fpregs));
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ sizeof(*fpregs), -1);
}
/*
- * make sure the single step bit is not set
+ * update the contents of the MN10300 userspace FPU registers
*/
-void ptrace_disable(struct task_struct *child)
+static int fpuregs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct fpu_state_struct fpu_state = target->thread.fpu_state;
+ int ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &fpu_state, 0, sizeof(fpu_state));
+ if (ret < 0)
+ return ret;
+
+ fpu_kill_state(target);
+ target->thread.fpu_state = fpu_state;
+ set_using_fpu(target);
+
+ return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ sizeof(fpu_state), -1);
+}
+
+/*
+ * determine if the FPU registers have actually been used
+ */
+static int fpuregs_active(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ return is_using_fpu(target) ? regset->n : 0;
+}
+
+/*
+ * Define the register sets available on the MN10300 under Linux
+ */
+enum mn10300_regset {
+ REGSET_GENERAL,
+ REGSET_FPU,
+};
+
+static const struct user_regset mn10300_regsets[] = {
+ /*
+ * General register format is:
+ * A3, A2, D3, D2, MCVF, MCRL, MCRH, MDRQ
+ * E1, E0, E7...E2, SP, LAR, LIR, MDR
+ * A1, A0, D1, D0, ORIG_D0, EPSW, PC
+ */
+ [REGSET_GENERAL] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = genregs_get,
+ .set = genregs_set,
+ },
+ /*
+ * FPU register format is:
+ * FS0-31, FPCR
+ */
+ [REGSET_FPU] = {
+ .core_note_type = NT_PRFPREG,
+ .n = sizeof(struct fpu_state_struct) / sizeof(long),
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = fpuregs_get,
+ .set = fpuregs_set,
+ .active = fpuregs_active,
+ },
+};
+
+static const struct user_regset_view user_mn10300_native_view = {
+ .name = "mn10300",
+ .e_machine = EM_MN10300,
+ .regsets = mn10300_regsets,
+ .n = ARRAY_SIZE(mn10300_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_mn10300_native_view;
+}
+
+/*
+ * set the single-step bit
+ */
+void user_enable_single_step(struct task_struct *child)
{
#ifndef CONFIG_MN10300_USING_JTAG
struct user *dummy = NULL;
long tmp;
tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
- tmp &= ~EPSW_T;
+ tmp |= EPSW_T;
put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
#endif
}
/*
- * set the single step bit
+ * make sure the single-step bit is not set
*/
-void ptrace_enable(struct task_struct *child)
+void user_disable_single_step(struct task_struct *child)
{
#ifndef CONFIG_MN10300_USING_JTAG
struct user *dummy = NULL;
long tmp;
tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
- tmp |= EPSW_T;
+ tmp &= ~EPSW_T;
put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
#endif
}
+void ptrace_disable(struct task_struct *child)
+{
+ user_disable_single_step(child);
+}
+
/*
* handle the arch-specific side of process tracing
*/
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
- struct fpu_state_struct fpu_state;
- int i, ret;
+ unsigned long tmp;
+ int ret;
switch (request) {
- /* read the word at location addr. */
- case PTRACE_PEEKTEXT: {
- unsigned long tmp;
- int copied;
-
- copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
- ret = -EIO;
- if (copied != sizeof(tmp))
- break;
- ret = put_user(tmp, (unsigned long *) data);
- break;
- }
-
- /* read the word at location addr. */
- case PTRACE_PEEKDATA: {
- unsigned long tmp;
- int copied;
-
- copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
- ret = -EIO;
- if (copied != sizeof(tmp))
- break;
- ret = put_user(tmp, (unsigned long *) data);
- break;
- }
-
/* read the word at location addr in the USER area. */
- case PTRACE_PEEKUSR: {
- unsigned long tmp;
-
+ case PTRACE_PEEKUSR:
ret = -EIO;
if ((addr & 3) || addr < 0 ||
addr > sizeof(struct user) - 3)
ptrace_regid_to_frame[addr]);
ret = put_user(tmp, (unsigned long *) data);
break;
- }
-
- /* write the word at location addr. */
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- if (access_process_vm(child, addr, &data, sizeof(data), 1) ==
- sizeof(data))
- ret = 0;
- else
- ret = -EIO;
- break;
/* write the word at location addr in the USER area */
case PTRACE_POKEUSR:
data);
break;
- /* continue and stop at next (return from) syscall */
- case PTRACE_SYSCALL:
- /* restart after signal. */
- case PTRACE_CONT:
- ret = -EIO;
- if ((unsigned long) data > _NSIG)
- 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);
- wake_up_process(child);
- ret = 0;
- break;
-
- /*
- * make the child exit
- * - the 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;
- clear_tsk_thread_flag(child, TIF_SINGLESTEP);
- ptrace_disable(child);
- wake_up_process(child);
- break;
-
- case PTRACE_SINGLESTEP: /* set the trap flag. */
-#ifndef CONFIG_MN10300_USING_JTAG
- ret = -EIO;
- if ((unsigned long) data > _NSIG)
- break;
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- ptrace_enable(child);
- child->exit_code = data;
- wake_up_process(child);
- ret = 0;
-#else
- ret = -EINVAL;
-#endif
- break;
-
- case PTRACE_DETACH: /* detach a process that was attached. */
- ret = ptrace_detach(child, data);
- break;
-
- /* Get all gp regs from the child. */
- case PTRACE_GETREGS: {
- unsigned long tmp;
-
- if (!access_ok(VERIFY_WRITE, (unsigned *) data, NR_PTREGS << 2)) {
- ret = -EIO;
- break;
- }
-
- for (i = 0; i < NR_PTREGS << 2; i += 4) {
- tmp = get_stack_long(child, ptrace_regid_to_frame[i]);
- __put_user(tmp, (unsigned long *) data);
- data += sizeof(tmp);
- }
- ret = 0;
- break;
- }
-
- case PTRACE_SETREGS: { /* Set all gp regs in the child. */
- unsigned long tmp;
-
- if (!access_ok(VERIFY_READ, (unsigned long *)data,
- sizeof(struct pt_regs))) {
- ret = -EIO;
- break;
- }
-
- for (i = 0; i < NR_PTREGS << 2; i += 4) {
- __get_user(tmp, (unsigned long *) data);
- put_stack_long(child, ptrace_regid_to_frame[i], tmp);
- data += sizeof(tmp);
- }
- ret = 0;
- break;
- }
-
- case PTRACE_GETFPREGS: { /* Get the child FPU state. */
- if (is_using_fpu(child)) {
- unlazy_fpu(child);
- fpu_state = child->thread.fpu_state;
- } else {
- memset(&fpu_state, 0, sizeof(fpu_state));
- }
-
- ret = -EIO;
- if (copy_to_user((void *) data, &fpu_state,
- sizeof(fpu_state)) == 0)
- ret = 0;
- break;
- }
-
- case PTRACE_SETFPREGS: { /* Set the child FPU state. */
- ret = -EFAULT;
- if (copy_from_user(&fpu_state, (const void *) data,
- sizeof(fpu_state)) == 0) {
- fpu_kill_state(child);
- child->thread.fpu_state = fpu_state;
- set_using_fpu(child);
- ret = 0;
- }
- break;
- }
-
- case PTRACE_SETOPTIONS: {
- if (data & PTRACE_O_TRACESYSGOOD)
- child->ptrace |= PT_TRACESYSGOOD;
- else
- child->ptrace &= ~PT_TRACESYSGOOD;
- ret = 0;
- break;
- }
+ case PTRACE_GETREGS: /* Get all integer regs from the child. */
+ return copy_regset_to_user(child, &user_mn10300_native_view,
+ REGSET_GENERAL,
+ 0, NR_PTREGS * sizeof(long),
+ (void __user *)data);
+
+ case PTRACE_SETREGS: /* Set all integer regs in the child. */
+ return copy_regset_from_user(child, &user_mn10300_native_view,
+ REGSET_GENERAL,
+ 0, NR_PTREGS * sizeof(long),
+ (const void __user *)data);
+
+ case PTRACE_GETFPREGS: /* Get the child FPU state. */
+ return copy_regset_to_user(child, &user_mn10300_native_view,
+ REGSET_FPU,
+ 0, sizeof(struct fpu_state_struct),
+ (void __user *)data);
+
+ case PTRACE_SETFPREGS: /* Set the child FPU state. */
+ return copy_regset_from_user(child, &user_mn10300_native_view,
+ REGSET_FPU,
+ 0, sizeof(struct fpu_state_struct),
+ (const void __user *)data);
default:
- ret = -EIO;
+ ret = ptrace_request(child, request, addr, data);
break;
}
}
/*
- * notification of system call entry/exit
- * - triggered by current->work.syscall_trace
+ * handle tracing of system call entry
+ * - return the revised system call number or ULONG_MAX to cause ENOSYS
*/
-asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
+asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
{
-#if 0
- /* just in case... */
- printk(KERN_DEBUG "[%d] syscall_%lu(%lx,%lx,%lx,%lx) = %lx\n",
- current->pid,
- regs->orig_d0,
- regs->a0,
- regs->d1,
- regs->a3,
- regs->a2,
- regs->d0);
- return;
-#endif
-
- if (!test_thread_flag(TIF_SYSCALL_TRACE) &&
- !test_thread_flag(TIF_SINGLESTEP))
- return;
- if (!(current->ptrace & PT_PTRACED))
- return;
+ if (tracehook_report_syscall_entry(regs))
+ /* tracing decided this syscall should not happen, so
+ * We'll return a bogus call number to get an ENOSYS
+ * error, but leave the original number in
+ * regs->orig_d0
+ */
+ return ULONG_MAX;
- /* 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) &&
- !test_thread_flag(TIF_SINGLESTEP) ? 0x80 : 0));
+ return regs->orig_d0;
+}
- /*
- * 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;
- }
+/*
+ * handle tracing of system call exit
+ */
+asmlinkage void syscall_trace_exit(struct pt_regs *regs)
+{
+ tracehook_report_syscall_exit(regs, 0);
}
Code Review / linux-3.10.git / commitdiff