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-rw-r--r--kernel/debug/gdbstub.c191
1 files changed, 136 insertions, 55 deletions
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index e8fd6868682d..481a7bd2dfe7 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -6,7 +6,7 @@
* Copyright (C) 2000-2001 VERITAS Software Corporation.
* Copyright (C) 2002-2004 Timesys Corporation
* Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
- * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2004 Pavel Machek <pavel@ucw.cz>
* Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
* Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
* Copyright (C) 2005-2009 Wind River Systems, Inc.
@@ -52,17 +52,6 @@ static unsigned long gdb_regs[(NUMREGBYTES +
* GDB remote protocol parser:
*/
-static int hex(char ch)
-{
- if ((ch >= 'a') && (ch <= 'f'))
- return ch - 'a' + 10;
- if ((ch >= '0') && (ch <= '9'))
- return ch - '0';
- if ((ch >= 'A') && (ch <= 'F'))
- return ch - 'A' + 10;
- return -1;
-}
-
#ifdef CONFIG_KGDB_KDB
static int gdbstub_read_wait(void)
{
@@ -123,8 +112,8 @@ static void get_packet(char *buffer)
buffer[count] = 0;
if (ch == '#') {
- xmitcsum = hex(gdbstub_read_wait()) << 4;
- xmitcsum += hex(gdbstub_read_wait());
+ xmitcsum = hex_to_bin(gdbstub_read_wait()) << 4;
+ xmitcsum += hex_to_bin(gdbstub_read_wait());
if (checksum != xmitcsum)
/* failed checksum */
@@ -236,7 +225,7 @@ void gdbstub_msg_write(const char *s, int len)
* buf. Return a pointer to the last char put in buf (null). May
* return an error.
*/
-int kgdb_mem2hex(char *mem, char *buf, int count)
+char *kgdb_mem2hex(char *mem, char *buf, int count)
{
char *tmp;
int err;
@@ -248,17 +237,16 @@ int kgdb_mem2hex(char *mem, char *buf, int count)
tmp = buf + count;
err = probe_kernel_read(tmp, mem, count);
- if (!err) {
- while (count > 0) {
- buf = pack_hex_byte(buf, *tmp);
- tmp++;
- count--;
- }
-
- *buf = 0;
+ if (err)
+ return NULL;
+ while (count > 0) {
+ buf = pack_hex_byte(buf, *tmp);
+ tmp++;
+ count--;
}
+ *buf = 0;
- return err;
+ return buf;
}
/*
@@ -280,8 +268,8 @@ int kgdb_hex2mem(char *buf, char *mem, int count)
tmp_hex = tmp_raw - 1;
while (tmp_hex >= buf) {
tmp_raw--;
- *tmp_raw = hex(*tmp_hex--);
- *tmp_raw |= hex(*tmp_hex--) << 4;
+ *tmp_raw = hex_to_bin(*tmp_hex--);
+ *tmp_raw |= hex_to_bin(*tmp_hex--) << 4;
}
return probe_kernel_write(mem, tmp_raw, count);
@@ -304,7 +292,7 @@ int kgdb_hex2long(char **ptr, unsigned long *long_val)
(*ptr)++;
}
while (**ptr) {
- hex_val = hex(**ptr);
+ hex_val = hex_to_bin(**ptr);
if (hex_val < 0)
break;
@@ -339,6 +327,32 @@ static int kgdb_ebin2mem(char *buf, char *mem, int count)
return probe_kernel_write(mem, c, size);
}
+#if DBG_MAX_REG_NUM > 0
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ int i;
+ int idx = 0;
+ char *ptr = (char *)gdb_regs;
+
+ for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+ dbg_get_reg(i, ptr + idx, regs);
+ idx += dbg_reg_def[i].size;
+ }
+}
+
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ int i;
+ int idx = 0;
+ char *ptr = (char *)gdb_regs;
+
+ for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+ dbg_set_reg(i, ptr + idx, regs);
+ idx += dbg_reg_def[i].size;
+ }
+}
+#endif /* DBG_MAX_REG_NUM > 0 */
+
/* Write memory due to an 'M' or 'X' packet. */
static int write_mem_msg(int binary)
{
@@ -378,28 +392,31 @@ static void error_packet(char *pkt, int error)
* remapped to negative TIDs.
*/
-#define BUF_THREAD_ID_SIZE 16
+#define BUF_THREAD_ID_SIZE 8
static char *pack_threadid(char *pkt, unsigned char *id)
{
- char *limit;
+ unsigned char *limit;
+ int lzero = 1;
+
+ limit = id + (BUF_THREAD_ID_SIZE / 2);
+ while (id < limit) {
+ if (!lzero || *id != 0) {
+ pkt = pack_hex_byte(pkt, *id);
+ lzero = 0;
+ }
+ id++;
+ }
- limit = pkt + BUF_THREAD_ID_SIZE;
- while (pkt < limit)
- pkt = pack_hex_byte(pkt, *id++);
+ if (lzero)
+ pkt = pack_hex_byte(pkt, 0);
return pkt;
}
static void int_to_threadref(unsigned char *id, int value)
{
- unsigned char *scan;
- int i = 4;
-
- scan = (unsigned char *)id;
- while (i--)
- *scan++ = 0;
- put_unaligned_be32(value, scan);
+ put_unaligned_be32(value, id);
}
static struct task_struct *getthread(struct pt_regs *regs, int tid)
@@ -463,8 +480,7 @@ static void gdb_cmd_status(struct kgdb_state *ks)
pack_hex_byte(&remcom_out_buffer[1], ks->signo);
}
-/* Handle the 'g' get registers request */
-static void gdb_cmd_getregs(struct kgdb_state *ks)
+static void gdb_get_regs_helper(struct kgdb_state *ks)
{
struct task_struct *thread;
void *local_debuggerinfo;
@@ -505,6 +521,12 @@ static void gdb_cmd_getregs(struct kgdb_state *ks)
*/
sleeping_thread_to_gdb_regs(gdb_regs, thread);
}
+}
+
+/* Handle the 'g' get registers request */
+static void gdb_cmd_getregs(struct kgdb_state *ks)
+{
+ gdb_get_regs_helper(ks);
kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
}
@@ -527,13 +549,13 @@ static void gdb_cmd_memread(struct kgdb_state *ks)
char *ptr = &remcom_in_buffer[1];
unsigned long length;
unsigned long addr;
- int err;
+ char *err;
if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
kgdb_hex2long(&ptr, &length) > 0) {
err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
- if (err)
- error_packet(remcom_out_buffer, err);
+ if (!err)
+ error_packet(remcom_out_buffer, -EINVAL);
} else {
error_packet(remcom_out_buffer, -EINVAL);
}
@@ -550,6 +572,60 @@ static void gdb_cmd_memwrite(struct kgdb_state *ks)
strcpy(remcom_out_buffer, "OK");
}
+#if DBG_MAX_REG_NUM > 0
+static char *gdb_hex_reg_helper(int regnum, char *out)
+{
+ int i;
+ int offset = 0;
+
+ for (i = 0; i < regnum; i++)
+ offset += dbg_reg_def[i].size;
+ return kgdb_mem2hex((char *)gdb_regs + offset, out,
+ dbg_reg_def[i].size);
+}
+
+/* Handle the 'p' individual regster get */
+static void gdb_cmd_reg_get(struct kgdb_state *ks)
+{
+ unsigned long regnum;
+ char *ptr = &remcom_in_buffer[1];
+
+ kgdb_hex2long(&ptr, &regnum);
+ if (regnum >= DBG_MAX_REG_NUM) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ return;
+ }
+ gdb_get_regs_helper(ks);
+ gdb_hex_reg_helper(regnum, remcom_out_buffer);
+}
+
+/* Handle the 'P' individual regster set */
+static void gdb_cmd_reg_set(struct kgdb_state *ks)
+{
+ unsigned long regnum;
+ char *ptr = &remcom_in_buffer[1];
+ int i = 0;
+
+ kgdb_hex2long(&ptr, &regnum);
+ if (*ptr++ != '=' ||
+ !(!kgdb_usethread || kgdb_usethread == current) ||
+ !dbg_get_reg(regnum, gdb_regs, ks->linux_regs)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ return;
+ }
+ memset(gdb_regs, 0, sizeof(gdb_regs));
+ while (i < sizeof(gdb_regs) * 2)
+ if (hex_to_bin(ptr[i]) >= 0)
+ i++;
+ else
+ break;
+ i = i / 2;
+ kgdb_hex2mem(ptr, (char *)gdb_regs, i);
+ dbg_set_reg(regnum, gdb_regs, ks->linux_regs);
+ strcpy(remcom_out_buffer, "OK");
+}
+#endif /* DBG_MAX_REG_NUM > 0 */
+
/* Handle the 'X' memory binary write bytes */
static void gdb_cmd_binwrite(struct kgdb_state *ks)
{
@@ -612,7 +688,7 @@ static void gdb_cmd_query(struct kgdb_state *ks)
{
struct task_struct *g;
struct task_struct *p;
- unsigned char thref[8];
+ unsigned char thref[BUF_THREAD_ID_SIZE];
char *ptr;
int i;
int cpu;
@@ -632,8 +708,7 @@ static void gdb_cmd_query(struct kgdb_state *ks)
for_each_online_cpu(cpu) {
ks->thr_query = 0;
int_to_threadref(thref, -cpu - 2);
- pack_threadid(ptr, thref);
- ptr += BUF_THREAD_ID_SIZE;
+ ptr = pack_threadid(ptr, thref);
*(ptr++) = ',';
i++;
}
@@ -642,8 +717,7 @@ static void gdb_cmd_query(struct kgdb_state *ks)
do_each_thread(g, p) {
if (i >= ks->thr_query && !finished) {
int_to_threadref(thref, p->pid);
- pack_threadid(ptr, thref);
- ptr += BUF_THREAD_ID_SIZE;
+ ptr = pack_threadid(ptr, thref);
*(ptr++) = ',';
ks->thr_query++;
if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
@@ -858,11 +932,14 @@ int gdb_serial_stub(struct kgdb_state *ks)
int error = 0;
int tmp;
- /* Clear the out buffer. */
+ /* Initialize comm buffer and globals. */
memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
+ kgdb_usethread = kgdb_info[ks->cpu].task;
+ ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
+ ks->pass_exception = 0;
if (kgdb_connected) {
- unsigned char thref[8];
+ unsigned char thref[BUF_THREAD_ID_SIZE];
char *ptr;
/* Reply to host that an exception has occurred */
@@ -876,10 +953,6 @@ int gdb_serial_stub(struct kgdb_state *ks)
put_packet(remcom_out_buffer);
}
- kgdb_usethread = kgdb_info[ks->cpu].task;
- ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
- ks->pass_exception = 0;
-
while (1) {
error = 0;
@@ -904,6 +977,14 @@ int gdb_serial_stub(struct kgdb_state *ks)
case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
gdb_cmd_memwrite(ks);
break;
+#if DBG_MAX_REG_NUM > 0
+ case 'p': /* pXX Return gdb register XX (in hex) */
+ gdb_cmd_reg_get(ks);
+ break;
+ case 'P': /* PXX=aaaa Set gdb register XX to aaaa (in hex) */
+ gdb_cmd_reg_set(ks);
+ break;
+#endif /* DBG_MAX_REG_NUM > 0 */
case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
gdb_cmd_binwrite(ks);
break;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.