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MIPS: Ptrace support for HARDWARE_WATCHPOINTS

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This is the final part of the watch register patch.  Here we hook up
ptrace so that the user space debugger (gdb), can set and read the
registers.

Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney
2008-09-23 00:11:26 -07:00
committed by Ralf Baechle
parent 2c708cbaa6
commit 0926bf953e
3 changed files with 155 additions and 1 deletions
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46
arch/mips/include/asm/ptrace.h
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@@ -74,11 +74,57 @@ struct pt_regs {
#define PTRACE_POKEDATA_3264 0xc3
#define PTRACE_GET_THREAD_AREA_3264 0xc4
/* Read and write watchpoint registers. */
enum pt_watch_style {
pt_watch_style_mips32,
pt_watch_style_mips64
};
struct mips32_watch_regs {
uint32_t watchlo[8];
/* Lower 16 bits of watchhi. */
uint16_t watchhi[8];
/* Valid mask and I R W bits.
* bit 0 -- 1 if W bit is usable.
* bit 1 -- 1 if R bit is usable.
* bit 2 -- 1 if I bit is usable.
* bits 3 - 11 -- Valid watchhi mask bits.
*/
uint16_t watch_masks[8];
/* The number of valid watch register pairs. */
uint32_t num_valid;
} __attribute__((aligned(8)));
struct mips64_watch_regs {
uint64_t watchlo[8];
uint16_t watchhi[8];
uint16_t watch_masks[8];
uint32_t num_valid;
} __attribute__((aligned(8)));
struct pt_watch_regs {
enum pt_watch_style style;
union {
struct mips32_watch_regs mips32;
struct mips32_watch_regs mips64;
};
};
#define PTRACE_GET_WATCH_REGS 0xd0
#define PTRACE_SET_WATCH_REGS 0xd1
#ifdef __KERNEL__
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/isadep.h>
struct task_struct;
extern int ptrace_get_watch_regs(struct task_struct *child,
struct pt_watch_regs __user *addr);
extern int ptrace_set_watch_regs(struct task_struct *child,
struct pt_watch_regs __user *addr);
/*
* Does the process account for user or for system time?
*/