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Commit 3b5b60b8 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb 

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
  kgdbts: Use HW breakpoints with CONFIG_DEBUG_RODATA
  kgdb: use common ascii helpers and put_unaligned_be32 helper
parents d430a227 b33cb815

drivers/misc/kgdbts.c

+26 −7
Original line number Diff line number Diff line
@@ -102,7 +102,6 @@ 
#include <linux/nmi.h>

#include <linux/delay.h>

#include <linux/kthread.h>

#include <linux/delay.h>



#define v1printk(a...) do { \

	if (verbose) \
@@ -119,7 +118,6 @@ 
	} while (0)

#define MAX_CONFIG_LEN		40



static const char hexchars[] = "0123456789abcdef";

static struct kgdb_io kgdbts_io_ops;

static char get_buf[BUFMAX];

static int get_buf_cnt;
@@ -131,6 +129,8 @@ static int repeat_test; 
static int test_complete;

static int send_ack;

static int final_ack;

static int force_hwbrks;

static int hwbreaks_ok;

static int hw_break_val;

static int hw_break_val2;

#if defined(CONFIG_ARM) || defined(CONFIG_MIPS) || defined(CONFIG_SPARC)
@@ -234,12 +234,12 @@ static void break_helper(char *bp_type, char *arg, unsigned long vaddr) 


static void sw_break(char *arg)

{

	break_helper("Z0", arg, 0);

	break_helper(force_hwbrks ? "Z1" : "Z0", arg, 0);

}



static void sw_rem_break(char *arg)

{

	break_helper("z0", arg, 0);

	break_helper(force_hwbrks ? "z1" : "z0", arg, 0);

}



static void hw_break(char *arg)
@@ -619,8 +619,8 @@ static void fill_get_buf(char *buf) 
		count++;

	}

	strcat(get_buf, "#");

	get_buf[count + 2] = hexchars[checksum >> 4];

	get_buf[count + 3] = hexchars[checksum & 0xf];

	get_buf[count + 2] = hex_asc_hi(checksum);

	get_buf[count + 3] = hex_asc_lo(checksum);

	get_buf[count + 4] = '\0';

	v2printk("get%i: %s\n", ts.idx, get_buf);

}
@@ -781,6 +781,8 @@ static void run_breakpoint_test(int is_hw_breakpoint) 
		return;



	eprintk("kgdbts: ERROR %s test failed\n", ts.name);

	if (is_hw_breakpoint)

		hwbreaks_ok = 0;

}



static void run_hw_break_test(int is_write_test)
@@ -798,9 +800,11 @@ static void run_hw_break_test(int is_write_test) 
	kgdb_breakpoint();

	hw_break_val_access();

	if (is_write_test) {

		if (test_complete == 2)

		if (test_complete == 2) {

			eprintk("kgdbts: ERROR %s broke on access\n",

				ts.name);

			hwbreaks_ok = 0;

		}

		hw_break_val_write();

	}

	kgdb_breakpoint();
@@ -809,6 +813,7 @@ static void run_hw_break_test(int is_write_test) 
		return;



	eprintk("kgdbts: ERROR %s test failed\n", ts.name);

	hwbreaks_ok = 0;

}



static void run_nmi_sleep_test(int nmi_sleep)
@@ -912,6 +917,7 @@ static void kgdbts_run_tests(void) 


	/* All HW break point tests */

	if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT) {

		hwbreaks_ok = 1;

		v1printk("kgdbts:RUN hw breakpoint test\n");

		run_breakpoint_test(1);

		v1printk("kgdbts:RUN hw write breakpoint test\n");
@@ -925,6 +931,19 @@ static void kgdbts_run_tests(void) 
		run_nmi_sleep_test(nmi_sleep);

	}



#ifdef CONFIG_DEBUG_RODATA

	/* Until there is an api to write to read-only text segments, use

	 * HW breakpoints for the remainder of any tests, else print a

	 * failure message if hw breakpoints do not work.

	 */

	if (!(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT && hwbreaks_ok)) {

		eprintk("kgdbts: HW breakpoints do not work,"

			"skipping remaining tests\n");

		return;

	}

	force_hwbrks = 1;

#endif /* CONFIG_DEBUG_RODATA */



	/* If the do_fork test is run it will be the last test that is

	 * executed because a kernel thread will be spawned at the very

	 * end to unregister the debug hooks.

kernel/kgdb.c

+6 −10
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ 
#include <asm/byteorder.h>

#include <asm/atomic.h>

#include <asm/system.h>

#include <asm/unaligned.h>



static int kgdb_break_asap;
@@ -227,8 +228,6 @@ void __weak kgdb_disable_hw_debug(struct pt_regs *regs) 
 * GDB remote protocol parser:

 */



static const char	hexchars[] = "0123456789abcdef";



static int hex(char ch)

{

	if ((ch >= 'a') && (ch <= 'f'))
@@ -316,8 +315,8 @@ static void put_packet(char *buffer) 
		}



		kgdb_io_ops->write_char('#');

		kgdb_io_ops->write_char(hexchars[checksum >> 4]);

		kgdb_io_ops->write_char(hexchars[checksum & 0xf]);

		kgdb_io_ops->write_char(hex_asc_hi(checksum));

		kgdb_io_ops->write_char(hex_asc_lo(checksum));

		if (kgdb_io_ops->flush)

			kgdb_io_ops->flush();
@@ -478,8 +477,8 @@ static void error_packet(char *pkt, int error) 
{

	error = -error;

	pkt[0] = 'E';

	pkt[1] = hexchars[(error / 10)];

	pkt[2] = hexchars[(error % 10)];

	pkt[1] = hex_asc[(error / 10)];

	pkt[2] = hex_asc[(error % 10)];

	pkt[3] = '\0';

}
@@ -510,10 +509,7 @@ static void int_to_threadref(unsigned char *id, int value) 
	scan = (unsigned char *)id;

	while (i--)

		*scan++ = 0;

	*scan++ = (value >> 24) & 0xff;

	*scan++ = (value >> 16) & 0xff;

	*scan++ = (value >> 8) & 0xff;

	*scan++ = (value & 0xff);

	put_unaligned_be32(value, scan);

}



static struct task_struct *getthread(struct pt_regs *regs, int tid)