microblaze_v8: ptrace support
Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: John Linn <john.linn@xilinx.com> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: John Williams <john.williams@petalogix.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
parent
216f03481d
commit
2b43845426
|
@ -0,0 +1,68 @@
|
||||||
|
/*
|
||||||
|
* Copyright (C) 2006 Atmark Techno, Inc.
|
||||||
|
*
|
||||||
|
* This file is subject to the terms and conditions of the GNU General Public
|
||||||
|
* License. See the file "COPYING" in the main directory of this archive
|
||||||
|
* for more details.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef _ASM_MICROBLAZE_PTRACE_H
|
||||||
|
#define _ASM_MICROBLAZE_PTRACE_H
|
||||||
|
|
||||||
|
#ifndef __ASSEMBLY__
|
||||||
|
#include <linux/types.h>
|
||||||
|
|
||||||
|
typedef unsigned long microblaze_reg_t;
|
||||||
|
|
||||||
|
struct pt_regs {
|
||||||
|
microblaze_reg_t r0;
|
||||||
|
microblaze_reg_t r1;
|
||||||
|
microblaze_reg_t r2;
|
||||||
|
microblaze_reg_t r3;
|
||||||
|
microblaze_reg_t r4;
|
||||||
|
microblaze_reg_t r5;
|
||||||
|
microblaze_reg_t r6;
|
||||||
|
microblaze_reg_t r7;
|
||||||
|
microblaze_reg_t r8;
|
||||||
|
microblaze_reg_t r9;
|
||||||
|
microblaze_reg_t r10;
|
||||||
|
microblaze_reg_t r11;
|
||||||
|
microblaze_reg_t r12;
|
||||||
|
microblaze_reg_t r13;
|
||||||
|
microblaze_reg_t r14;
|
||||||
|
microblaze_reg_t r15;
|
||||||
|
microblaze_reg_t r16;
|
||||||
|
microblaze_reg_t r17;
|
||||||
|
microblaze_reg_t r18;
|
||||||
|
microblaze_reg_t r19;
|
||||||
|
microblaze_reg_t r20;
|
||||||
|
microblaze_reg_t r21;
|
||||||
|
microblaze_reg_t r22;
|
||||||
|
microblaze_reg_t r23;
|
||||||
|
microblaze_reg_t r24;
|
||||||
|
microblaze_reg_t r25;
|
||||||
|
microblaze_reg_t r26;
|
||||||
|
microblaze_reg_t r27;
|
||||||
|
microblaze_reg_t r28;
|
||||||
|
microblaze_reg_t r29;
|
||||||
|
microblaze_reg_t r30;
|
||||||
|
microblaze_reg_t r31;
|
||||||
|
microblaze_reg_t pc;
|
||||||
|
microblaze_reg_t msr;
|
||||||
|
microblaze_reg_t ear;
|
||||||
|
microblaze_reg_t esr;
|
||||||
|
microblaze_reg_t fsr;
|
||||||
|
int kernel_mode;
|
||||||
|
};
|
||||||
|
|
||||||
|
#define kernel_mode(regs) ((regs)->kernel_mode)
|
||||||
|
#define user_mode(regs) (!kernel_mode(regs))
|
||||||
|
|
||||||
|
#define instruction_pointer(regs) ((regs)->pc)
|
||||||
|
#define profile_pc(regs) instruction_pointer(regs)
|
||||||
|
|
||||||
|
void show_regs(struct pt_regs *);
|
||||||
|
|
||||||
|
#endif /* __ASSEMBLY__ */
|
||||||
|
|
||||||
|
#endif /* _ASM_MICROBLAZE_PTRACE_H */
|
|
@ -0,0 +1,182 @@
|
||||||
|
/*
|
||||||
|
* `ptrace' system call
|
||||||
|
*
|
||||||
|
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
|
||||||
|
* Copyright (C) 2007-2009 PetaLogix
|
||||||
|
* Copyright (C) 2004-2007 John Williams <john.williams@petalogix.com>
|
||||||
|
*
|
||||||
|
* derived from arch/v850/kernel/ptrace.c
|
||||||
|
*
|
||||||
|
* Copyright (C) 2002,03 NEC Electronics Corporation
|
||||||
|
* Copyright (C) 2002,03 Miles Bader <miles@gnu.org>
|
||||||
|
*
|
||||||
|
* Derived from arch/mips/kernel/ptrace.c:
|
||||||
|
*
|
||||||
|
* Copyright (C) 1992 Ross Biro
|
||||||
|
* Copyright (C) Linus Torvalds
|
||||||
|
* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
|
||||||
|
* Copyright (C) 1996 David S. Miller
|
||||||
|
* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
|
||||||
|
* Copyright (C) 1999 MIPS Technologies, Inc.
|
||||||
|
*
|
||||||
|
* This file is subject to the terms and conditions of the GNU General
|
||||||
|
* Public License. See the file COPYING in the main directory of this
|
||||||
|
* archive for more details.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <linux/kernel.h>
|
||||||
|
#include <linux/mm.h>
|
||||||
|
#include <linux/sched.h>
|
||||||
|
#include <linux/smp_lock.h>
|
||||||
|
#include <linux/ptrace.h>
|
||||||
|
#include <linux/signal.h>
|
||||||
|
|
||||||
|
#include <linux/errno.h>
|
||||||
|
#include <linux/ptrace.h>
|
||||||
|
#include <asm/processor.h>
|
||||||
|
#include <linux/uaccess.h>
|
||||||
|
#include <asm/asm-offsets.h>
|
||||||
|
|
||||||
|
/* Returns the address where the register at REG_OFFS in P is stashed away. */
|
||||||
|
static microblaze_reg_t *reg_save_addr(unsigned reg_offs,
|
||||||
|
struct task_struct *t)
|
||||||
|
{
|
||||||
|
struct pt_regs *regs;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Three basic cases:
|
||||||
|
*
|
||||||
|
* (1) A register normally saved before calling the scheduler, is
|
||||||
|
* available in the kernel entry pt_regs structure at the top
|
||||||
|
* of the kernel stack. The kernel trap/irq exit path takes
|
||||||
|
* care to save/restore almost all registers for ptrace'd
|
||||||
|
* processes.
|
||||||
|
*
|
||||||
|
* (2) A call-clobbered register, where the process P entered the
|
||||||
|
* kernel via [syscall] trap, is not stored anywhere; that's
|
||||||
|
* OK, because such registers are not expected to be preserved
|
||||||
|
* when the trap returns anyway (so we don't actually bother to
|
||||||
|
* test for this case).
|
||||||
|
*
|
||||||
|
* (3) A few registers not used at all by the kernel, and so
|
||||||
|
* normally never saved except by context-switches, are in the
|
||||||
|
* context switch state.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Register saved during kernel entry (or not available). */
|
||||||
|
regs = task_pt_regs(t);
|
||||||
|
|
||||||
|
return (microblaze_reg_t *)((char *)regs + reg_offs);
|
||||||
|
}
|
||||||
|
|
||||||
|
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
|
||||||
|
{
|
||||||
|
int rval;
|
||||||
|
unsigned long val = 0;
|
||||||
|
unsigned long copied;
|
||||||
|
|
||||||
|
switch (request) {
|
||||||
|
case PTRACE_PEEKTEXT: /* read word at location addr. */
|
||||||
|
case PTRACE_PEEKDATA:
|
||||||
|
pr_debug("PEEKTEXT/PEEKDATA at %08lX\n", addr);
|
||||||
|
copied = access_process_vm(child, addr, &val, sizeof(val), 0);
|
||||||
|
rval = -EIO;
|
||||||
|
if (copied != sizeof(val))
|
||||||
|
break;
|
||||||
|
rval = put_user(val, (unsigned long *)data);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case PTRACE_POKETEXT: /* write the word at location addr. */
|
||||||
|
case PTRACE_POKEDATA:
|
||||||
|
pr_debug("POKETEXT/POKEDATA to %08lX\n", addr);
|
||||||
|
rval = 0;
|
||||||
|
if (access_process_vm(child, addr, &data, sizeof(data), 1)
|
||||||
|
== sizeof(data))
|
||||||
|
break;
|
||||||
|
rval = -EIO;
|
||||||
|
break;
|
||||||
|
|
||||||
|
/* Read/write the word at location ADDR in the registers. */
|
||||||
|
case PTRACE_PEEKUSR:
|
||||||
|
case PTRACE_POKEUSR:
|
||||||
|
pr_debug("PEEKUSR/POKEUSR : 0x%08lx\n", addr);
|
||||||
|
rval = 0;
|
||||||
|
if (addr >= PT_SIZE && request == PTRACE_PEEKUSR) {
|
||||||
|
/*
|
||||||
|
* Special requests that don't actually correspond
|
||||||
|
* to offsets in struct pt_regs.
|
||||||
|
*/
|
||||||
|
if (addr == PT_TEXT_ADDR) {
|
||||||
|
val = child->mm->start_code;
|
||||||
|
} else if (addr == PT_DATA_ADDR) {
|
||||||
|
val = child->mm->start_data;
|
||||||
|
} else if (addr == PT_TEXT_LEN) {
|
||||||
|
val = child->mm->end_code
|
||||||
|
- child->mm->start_code;
|
||||||
|
} else {
|
||||||
|
rval = -EIO;
|
||||||
|
}
|
||||||
|
} else if (addr >= 0 && addr < PT_SIZE && (addr & 0x3) == 0) {
|
||||||
|
microblaze_reg_t *reg_addr = reg_save_addr(addr, child);
|
||||||
|
if (request == PTRACE_PEEKUSR)
|
||||||
|
val = *reg_addr;
|
||||||
|
else
|
||||||
|
*reg_addr = data;
|
||||||
|
} else
|
||||||
|
rval = -EIO;
|
||||||
|
|
||||||
|
if (rval == 0 && request == PTRACE_PEEKUSR)
|
||||||
|
rval = put_user(val, (unsigned long *)data);
|
||||||
|
break;
|
||||||
|
/* Continue and stop at next (return from) syscall */
|
||||||
|
case PTRACE_SYSCALL:
|
||||||
|
pr_debug("PTRACE_SYSCALL\n");
|
||||||
|
case PTRACE_SINGLESTEP:
|
||||||
|
pr_debug("PTRACE_SINGLESTEP\n");
|
||||||
|
/* Restart after a signal. */
|
||||||
|
case PTRACE_CONT:
|
||||||
|
pr_debug("PTRACE_CONT\n");
|
||||||
|
rval = -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;
|
||||||
|
pr_debug("wakeup_process\n");
|
||||||
|
wake_up_process(child);
|
||||||
|
rval = 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:
|
||||||
|
pr_debug("PTRACE_KILL\n");
|
||||||
|
rval = 0;
|
||||||
|
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
|
||||||
|
break;
|
||||||
|
child->exit_code = SIGKILL;
|
||||||
|
wake_up_process(child);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case PTRACE_DETACH: /* detach a process that was attached. */
|
||||||
|
pr_debug("PTRACE_DETACH\n");
|
||||||
|
rval = ptrace_detach(child, data);
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
/* rval = ptrace_request(child, request, addr, data); noMMU */
|
||||||
|
rval = -EIO;
|
||||||
|
}
|
||||||
|
return rval;
|
||||||
|
}
|
||||||
|
|
||||||
|
void ptrace_disable(struct task_struct *child)
|
||||||
|
{
|
||||||
|
/* nothing to do */
|
||||||
|
}
|
Loading…
Reference in New Issue