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Commit c459dbf2 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: ptrace single stepping cleanups. 



This converts the single stepping done by sh/sh64 ptrace implementations
to use the generic user_enable/disable_single_step(), and subsequently
rips out a lot of ptrace request cases that are now handled generically.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent c4637d47

arch/sh/include/asm/ptrace.h

+9 −0
Original line number Diff line number Diff line
@@ -104,6 +104,15 @@ struct pt_dspregs { 


extern void show_regs(struct pt_regs *);



/*

 * These are defined as per linux/ptrace.h.

 */

struct task_struct;



#define arch_has_single_step()	(1)

extern void user_enable_single_step(struct task_struct *);

extern void user_disable_single_step(struct task_struct *);



#ifdef CONFIG_SH_DSP

#define task_pt_regs(task) \

	((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE \

arch/sh/kernel/ptrace_32.c

+18 −75
Original line number Diff line number Diff line
@@ -58,7 +58,23 @@ static inline int put_stack_long(struct task_struct *task, int offset, 
	return 0;

}



static void ptrace_disable_singlestep(struct task_struct *child)

void user_enable_single_step(struct task_struct *child)

{

	struct pt_regs *regs = task_pt_regs(child);

	long pc;



	pc = get_stack_long(child, (long)&regs->pc);



	/* Next scheduling will set up UBC */

	if (child->thread.ubc_pc == 0)

		ubc_usercnt += 1;



	child->thread.ubc_pc = pc;



	set_tsk_thread_flag(child, TIF_SINGLESTEP);

}



void user_disable_single_step(struct task_struct *child)

{

	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
@@ -82,7 +98,7 @@ static void ptrace_disable_singlestep(struct task_struct *child) 
 */

void ptrace_disable(struct task_struct *child)

{

	ptrace_disable_singlestep(child);

	user_disable_single_step(child);

}



long arch_ptrace(struct task_struct *child, long request, long addr, long data)
@@ -91,12 +107,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
	int ret;



	switch (request) {

	/* when I and D space are separate, these will need to be fixed. */

	case PTRACE_PEEKTEXT: /* read word at location addr. */

	case PTRACE_PEEKDATA:

		ret = generic_ptrace_peekdata(child, addr, data);

		break;



	/* read the word at location addr in the USER area. */

	case PTRACE_PEEKUSR: {

		unsigned long tmp;
@@ -126,12 +136,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
		break;

	}



	/* when I and D space are separate, this will have to be fixed. */

	case PTRACE_POKETEXT: /* write the word at location addr. */

	case PTRACE_POKEDATA:

		ret = generic_ptrace_pokedata(child, addr, data);

		break;



	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */

		ret = -EIO;

		if ((addr & 3) || addr < 0 ||
@@ -152,67 +156,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
		}

		break;



	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */

	case PTRACE_CONT: { /* restart after signal. */

		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);



		ptrace_disable_singlestep(child);



		child->exit_code = data;

		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;

		ptrace_disable_singlestep(child);

		child->exit_code = SIGKILL;

		wake_up_process(child);

		break;

	}



	case PTRACE_SINGLESTEP: {  /* set the trap flag. */

		long pc;

		struct pt_regs *regs = NULL;



		ret = -EIO;

		if (!valid_signal(data))

			break;

		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);

		if ((child->ptrace & PT_DTRACE) == 0) {

			/* Spurious delayed TF traps may occur */

			child->ptrace |= PT_DTRACE;

		}



		pc = get_stack_long(child, (long)&regs->pc);



		/* Next scheduling will set up UBC */

		if (child->thread.ubc_pc == 0)

			ubc_usercnt += 1;

		child->thread.ubc_pc = pc;



		set_tsk_thread_flag(child, TIF_SINGLESTEP);

		child->exit_code = data;

		/* give it a chance to run. */

		wake_up_process(child);

		ret = 0;

		break;

	}



#ifdef CONFIG_SH_DSP

	case PTRACE_GETDSPREGS: {

		unsigned long dp;

arch/sh/kernel/ptrace_64.c

+12 −65
Original line number Diff line number Diff line
@@ -121,18 +121,23 @@ put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data) 
	return 0;

}



void user_enable_single_step(struct task_struct *child)

{

	struct pt_regs *regs = child->thread.uregs;



	regs->sr |= SR_SSTEP;	/* auto-resetting upon exception */

}



void user_disable_single_step(struct task_struct *child)

{

	regs->sr &= ~SR_SSTEP;

}



long arch_ptrace(struct task_struct *child, long request, long addr, long data)

{

	int ret;



	switch (request) {

	/* when I and D space are separate, these will need to be fixed. */

	case PTRACE_PEEKTEXT: /* read word at location addr. */

	case PTRACE_PEEKDATA:

		ret = generic_ptrace_peekdata(child, addr, data);

		break;



	/* read the word at location addr in the USER area. */

	case PTRACE_PEEKUSR: {

		unsigned long tmp;
@@ -155,12 +160,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
		break;

	}



	/* when I and D space are separate, this will have to be fixed. */

	case PTRACE_POKETEXT: /* write the word at location addr. */

	case PTRACE_POKEDATA:

		ret = generic_ptrace_pokedata(child, addr, data);

		break;



	case PTRACE_POKEUSR:

                /* write the word at location addr in the USER area. We must

                   disallow any changes to certain SR bits or u_fpvalid, since
@@ -192,58 +191,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
		}

		break;



	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */

	case PTRACE_CONT: { /* restart after signal. */

		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;

		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;

		wake_up_process(child);

		break;

	}



	case PTRACE_SINGLESTEP: {  /* set the trap flag. */

		struct pt_regs *regs;



		ret = -EIO;

		if (!valid_signal(data))

			break;

		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);

		if ((child->ptrace & PT_DTRACE) == 0) {

			/* Spurious delayed TF traps may occur */

			child->ptrace |= PT_DTRACE;

		}



		regs = child->thread.uregs;



		regs->sr |= SR_SSTEP;	/* auto-resetting upon exception */



		child->exit_code = data;

		/* give it a chance to run. */

		wake_up_process(child);

		ret = 0;

		break;

	}



	default:

		ret = ptrace_request(child, request, addr, data);

		break;
@@ -341,5 +288,5 @@ asmlinkage void do_software_break_point(unsigned long long vec, 
 */

void ptrace_disable(struct task_struct *child)

{

        /* nothing to do.. */

	user_disable_single_step(child);

}