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freebsd-skq/sys/gdb/gdb_main.c

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/* -> /*- for copyright notices, minor format tweaks as necessary
2005-01-06 18:27:30 +00:00
/*-
sys/gdb: further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
2017-11-27 15:16:59 +00:00
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
* Copyright (c) 2004 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <machine/gdb_machdep.h>
#include <machine/kdb.h>
#include <gdb/gdb.h>
#include <gdb/gdb_int.h>
static dbbe_init_f gdb_init;
static dbbe_trap_f gdb_trap;
Update the ddb and gdb backends for the new 'trace_thread' hook. It is implemented via db_trace_thread() for DDB and not implemented for GDB. This should have been part of r234190. Pointy hat to: jhb Reported by: jkim MFC after: 1 week
2012-04-12 21:34:58 +00:00
KDB_BACKEND(gdb, gdb_init, NULL, NULL, gdb_trap);
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
Don't use GDB_DBGPORT() macro to fill in dummy element in gdb_dbgport_set.
2006-05-26 11:52:59 +00:00
static struct gdb_dbgport null_gdb_dbgport;
DATA_SET(gdb_dbgport_set, null_gdb_dbgport);
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
SET_DECLARE(gdb_dbgport_set, struct gdb_dbgport);
struct gdb_dbgport *gdb_cur = NULL;
add support for copying console messages to a remote gdb Reviewed by: kan
2006-03-23 23:06:14 +00:00
int gdb_listening = 0;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
Add support for gdb's memory searching capabilities to our in-kernel gdb server. Submitted by: Daniel O'Connor <daniel.oconnor@isilon.com> Reviewed by: jhb Sponsored by: EMC Isilon Storage Division
2014-09-05 16:40:47 +00:00
static unsigned char gdb_bindata[64];
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
static int
gdb_init(void)
{
struct gdb_dbgport *dp, **iter;
int cur_pri, pri;
gdb_cur = NULL;
cur_pri = -1;
SET_FOREACH(iter, gdb_dbgport_set) {
dp = *iter;
pri = (dp->gdb_probe != NULL) ? dp->gdb_probe() : -1;
dp->gdb_active = (pri >= 0) ? 0 : -1;
if (pri > cur_pri) {
cur_pri = pri;
gdb_cur = dp;
}
}
if (gdb_cur != NULL) {
printf("GDB: debug ports:");
SET_FOREACH(iter, gdb_dbgport_set) {
dp = *iter;
if (dp->gdb_active == 0)
printf(" %s", dp->gdb_name);
}
printf("\n");
} else
printf("GDB: no debug ports present\n");
if (gdb_cur != NULL) {
gdb_cur->gdb_init();
printf("GDB: current port: %s\n", gdb_cur->gdb_name);
}
add support for copying console messages to a remote gdb Reviewed by: kan
2006-03-23 23:06:14 +00:00
if (gdb_cur != NULL) {
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
cur_pri = (boothowto & RB_GDB) ? 2 : 0;
add support for copying console messages to a remote gdb Reviewed by: kan
2006-03-23 23:06:14 +00:00
gdb_consinit();
} else
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
cur_pri = -1;
return (cur_pri);
}
gdb kernel server: fixup Search:memory style This is a NFC patch to move around the Search:memory implementation so that it doesn't exceed the standard column width and doesn't take so much vertical space in gdb_trap. Submitted by: Daniel O'Connor <darius@dons.net.au> Reviewed by: cem, jhb Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D12684
2017-10-17 01:12:17 +00:00
static void
gdb_do_mem_search(void)
{
size_t patlen;
intmax_t addr, size;
const unsigned char *found;
if (gdb_rx_varhex(&addr) || gdb_rx_char() != ';' ||
gdb_rx_varhex(&size) || gdb_rx_char() != ';' ||
gdb_rx_bindata(gdb_bindata, sizeof(gdb_bindata), &patlen)) {
gdb_tx_err(EINVAL);
return;
}
if (gdb_search_mem((char *)(uintptr_t)addr, size, gdb_bindata,
patlen, &found)) {
if (found == 0ULL)
gdb_tx_begin('0');
else {
gdb_tx_begin('1');
gdb_tx_char(',');
gdb_tx_hex((intmax_t)(uintptr_t)found, 8);
}
gdb_tx_end();
} else
gdb_tx_err(EIO);
}
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
static int
gdb_trap(int type, int code)
{
Modify kdb_trap() so that it re-calls the dbbe_trap function as long as the debugger back-end has changed. This means that switching from ddb to gdb no longer requires a "step" which can be dangerous on an already-crashed kernel. Also add a capability to get from the gdb back-end back to ddb, by typing ^C in the console window. While here, simplify kdb_sysctl_available() by using sbuf_new_for_sysctl(), and use strlcpy() instead of strncpy() since the strlcpy semantic is desired. MFC after: 1 month
2011-02-18 22:25:11 +00:00
jmp_buf jb;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
struct thread *thr_iter;
Modify kdb_trap() so that it re-calls the dbbe_trap function as long as the debugger back-end has changed. This means that switching from ddb to gdb no longer requires a "step" which can be dangerous on an already-crashed kernel. Also add a capability to get from the gdb back-end back to ddb, by typing ^C in the console window. While here, simplify kdb_sysctl_available() by using sbuf_new_for_sysctl(), and use strlcpy() instead of strncpy() since the strlcpy semantic is desired. MFC after: 1 month
2011-02-18 22:25:11 +00:00
void *prev_jb;
prev_jb = kdb_jmpbuf(jb);
if (setjmp(jb) != 0) {
printf("%s bailing, hopefully back to ddb!\n", __func__);
gdb_listening = 0;
(void)kdb_jmpbuf(prev_jb);
return (1);
}
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
add support for copying console messages to a remote gdb Reviewed by: kan
2006-03-23 23:06:14 +00:00
gdb_listening = 0;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
/*
* Send a T packet. We currently do not support watchpoints (the
* awatch, rwatch or watch elements).
*/
gdb_tx_begin('T');
gdb_tx_hex(gdb_cpu_signal(type, code), 2);
gdb_tx_varhex(GDB_REG_PC);
gdb_tx_char(':');
gdb_tx_reg(GDB_REG_PC);
gdb_tx_char(';');
gdb_tx_str("thread:");
gdb_tx_varhex((long)kdb_thread->td_tid);
gdb_tx_char(';');
gdb_tx_end(); /* XXX check error condition. */
thr_iter = NULL;
while (gdb_rx_begin() == 0) {
Comment-out the debugging printf I left in in case there were some packet related problems. No problems have been reported.
2004-08-10 19:32:33 +00:00
/* printf("GDB: got '%s'\n", gdb_rxp); */
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
switch (gdb_rx_char()) {
case '?': /* Last signal. */
gdb_tx_begin('S');
gdb_tx_hex(gdb_cpu_signal(type, code), 2);
gdb_tx_end();
break;
case 'c': { /* Continue. */
uintmax_t addr;
Change gdb_cpu_setreg() to not take the value to which to set the specified register, but a pointer to the in-memory representation of that value. The reason for this is twofold: 1. Not all registers can be represented by a register_t. In particular FP registers fall in that category. Passing the new register value by reference instead of by value makes this point moot. 2. When we receive a G or P packet, both are for writing a register, the packet will have the register value in target-byte order and in the memory representation (modulo the fact that bytes are sent as 2 printable hexadecimal numbers of course). We only need to decode the packet to have a pointer to the register value. This change fixes the bug of extracting the register value of the P packet as a hexadecimal number instead of as a bit array. The quick (and dirty) fix to bswap the register value in gdb_cpu_setreg() as it has been added on i386 and amd64 can therefore be removed and has in fact been that. Tested on: alpha, amd64, i386, ia64, sparc64
2004-12-01 06:40:35 +00:00
register_t pc;
if (!gdb_rx_varhex(&addr)) {
pc = addr;
gdb_cpu_setreg(GDB_REG_PC, &pc);
}
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
kdb_cpu_clear_singlestep();
add support for copying console messages to a remote gdb Reviewed by: kan
2006-03-23 23:06:14 +00:00
gdb_listening = 1;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
return (1);
}
case 'C': { /* Continue with signal. */
uintmax_t addr, sig;
Change gdb_cpu_setreg() to not take the value to which to set the specified register, but a pointer to the in-memory representation of that value. The reason for this is twofold: 1. Not all registers can be represented by a register_t. In particular FP registers fall in that category. Passing the new register value by reference instead of by value makes this point moot. 2. When we receive a G or P packet, both are for writing a register, the packet will have the register value in target-byte order and in the memory representation (modulo the fact that bytes are sent as 2 printable hexadecimal numbers of course). We only need to decode the packet to have a pointer to the register value. This change fixes the bug of extracting the register value of the P packet as a hexadecimal number instead of as a bit array. The quick (and dirty) fix to bswap the register value in gdb_cpu_setreg() as it has been added on i386 and amd64 can therefore be removed and has in fact been that. Tested on: alpha, amd64, i386, ia64, sparc64
2004-12-01 06:40:35 +00:00
register_t pc;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' &&
Change gdb_cpu_setreg() to not take the value to which to set the specified register, but a pointer to the in-memory representation of that value. The reason for this is twofold: 1. Not all registers can be represented by a register_t. In particular FP registers fall in that category. Passing the new register value by reference instead of by value makes this point moot. 2. When we receive a G or P packet, both are for writing a register, the packet will have the register value in target-byte order and in the memory representation (modulo the fact that bytes are sent as 2 printable hexadecimal numbers of course). We only need to decode the packet to have a pointer to the register value. This change fixes the bug of extracting the register value of the P packet as a hexadecimal number instead of as a bit array. The quick (and dirty) fix to bswap the register value in gdb_cpu_setreg() as it has been added on i386 and amd64 can therefore be removed and has in fact been that. Tested on: alpha, amd64, i386, ia64, sparc64
2004-12-01 06:40:35 +00:00
!gdb_rx_varhex(&addr)) {
pc = addr;
gdb_cpu_setreg(GDB_REG_PC, &pc);
}
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
kdb_cpu_clear_singlestep();
add support for copying console messages to a remote gdb Reviewed by: kan
2006-03-23 23:06:14 +00:00
gdb_listening = 1;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
return (1);
}
Add support for kgdb's 'detach' command. Reviewed by: marcel Sponsored by: Network Appliance
2008-02-29 01:57:20 +00:00
case 'D': { /* Detach */
gdb_tx_ok();
kdb_cpu_clear_singlestep();
return (1);
}
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
case 'g': { /* Read registers. */
size_t r;
gdb_tx_begin(0);
for (r = 0; r < GDB_NREGS; r++)
gdb_tx_reg(r);
gdb_tx_end();
break;
}
case 'G': /* Write registers. */
gdb_tx_err(0);
break;
case 'H': { /* Set thread. */
intmax_t tid;
struct thread *thr;
gdb_rx_char();
check return value of gdb_rx_varhex Noticed by: Coverity Prevent analysis tool Reviewed by: kan
2005-03-28 18:31:18 +00:00
if (gdb_rx_varhex(&tid)) {
gdb_tx_err(EINVAL);
break;
}
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
if (tid > 0) {
thr = kdb_thr_lookup(tid);
if (thr == NULL) {
gdb_tx_err(ENOENT);
break;
}
kdb_thr_select(thr);
}
gdb_tx_ok();
break;
}
case 'k': /* Kill request. */
kdb_cpu_clear_singlestep();
add support for copying console messages to a remote gdb Reviewed by: kan
2006-03-23 23:06:14 +00:00
gdb_listening = 1;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
return (1);
case 'm': { /* Read memory. */
uintmax_t addr, size;
if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' ||
gdb_rx_varhex(&size)) {
gdb_tx_err(EINVAL);
break;
}
gdb_tx_begin(0);
if (gdb_tx_mem((char *)(uintptr_t)addr, size))
gdb_tx_end();
else
gdb_tx_err(EIO);
break;
}
case 'M': { /* Write memory. */
uintmax_t addr, size;
if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' ||
gdb_rx_varhex(&size) || gdb_rx_char() != ':') {
gdb_tx_err(EINVAL);
break;
}
if (gdb_rx_mem((char *)(uintptr_t)addr, size) == 0)
gdb_tx_err(EIO);
else
gdb_tx_ok();
break;
}
case 'P': { /* Write register. */
Change gdb_cpu_setreg() to not take the value to which to set the specified register, but a pointer to the in-memory representation of that value. The reason for this is twofold: 1. Not all registers can be represented by a register_t. In particular FP registers fall in that category. Passing the new register value by reference instead of by value makes this point moot. 2. When we receive a G or P packet, both are for writing a register, the packet will have the register value in target-byte order and in the memory representation (modulo the fact that bytes are sent as 2 printable hexadecimal numbers of course). We only need to decode the packet to have a pointer to the register value. This change fixes the bug of extracting the register value of the P packet as a hexadecimal number instead of as a bit array. The quick (and dirty) fix to bswap the register value in gdb_cpu_setreg() as it has been added on i386 and amd64 can therefore be removed and has in fact been that. Tested on: alpha, amd64, i386, ia64, sparc64
2004-12-01 06:40:35 +00:00
char *val;
uintmax_t reg;
val = gdb_rxp;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
if (gdb_rx_varhex(&reg) || gdb_rx_char() != '=' ||
Change gdb_cpu_setreg() to not take the value to which to set the specified register, but a pointer to the in-memory representation of that value. The reason for this is twofold: 1. Not all registers can be represented by a register_t. In particular FP registers fall in that category. Passing the new register value by reference instead of by value makes this point moot. 2. When we receive a G or P packet, both are for writing a register, the packet will have the register value in target-byte order and in the memory representation (modulo the fact that bytes are sent as 2 printable hexadecimal numbers of course). We only need to decode the packet to have a pointer to the register value. This change fixes the bug of extracting the register value of the P packet as a hexadecimal number instead of as a bit array. The quick (and dirty) fix to bswap the register value in gdb_cpu_setreg() as it has been added on i386 and amd64 can therefore be removed and has in fact been that. Tested on: alpha, amd64, i386, ia64, sparc64
2004-12-01 06:40:35 +00:00
!gdb_rx_mem(val, gdb_cpu_regsz(reg))) {
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
gdb_tx_err(EINVAL);
break;
}
gdb_cpu_setreg(reg, val);
gdb_tx_ok();
break;
}
case 'q': /* General query. */
if (gdb_rx_equal("fThreadInfo")) {
thr_iter = kdb_thr_first();
gdb_tx_begin('m');
gdb_tx_hex((long)thr_iter->td_tid, 8);
gdb_tx_end();
} else if (gdb_rx_equal("sThreadInfo")) {
if (thr_iter == NULL) {
gdb_tx_err(ENXIO);
break;
}
thr_iter = kdb_thr_next(thr_iter);
if (thr_iter != NULL) {
gdb_tx_begin('m');
gdb_tx_hex((long)thr_iter->td_tid, 8);
gdb_tx_end();
} else {
gdb_tx_begin('l');
gdb_tx_end();
}
Add support for gdb's memory searching capabilities to our in-kernel gdb server. Submitted by: Daniel O'Connor <daniel.oconnor@isilon.com> Reviewed by: jhb Sponsored by: EMC Isilon Storage Division
2014-09-05 16:40:47 +00:00
} else if (gdb_rx_equal("Search:memory:")) {
gdb kernel server: fixup Search:memory style This is a NFC patch to move around the Search:memory implementation so that it doesn't exceed the standard column width and doesn't take so much vertical space in gdb_trap. Submitted by: Daniel O'Connor <darius@dons.net.au> Reviewed by: cem, jhb Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D12684
2017-10-17 01:12:17 +00:00
gdb_do_mem_search();
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
} else if (!gdb_cpu_query())
gdb_tx_empty();
break;
case 's': { /* Step. */
uintmax_t addr;
Change gdb_cpu_setreg() to not take the value to which to set the specified register, but a pointer to the in-memory representation of that value. The reason for this is twofold: 1. Not all registers can be represented by a register_t. In particular FP registers fall in that category. Passing the new register value by reference instead of by value makes this point moot. 2. When we receive a G or P packet, both are for writing a register, the packet will have the register value in target-byte order and in the memory representation (modulo the fact that bytes are sent as 2 printable hexadecimal numbers of course). We only need to decode the packet to have a pointer to the register value. This change fixes the bug of extracting the register value of the P packet as a hexadecimal number instead of as a bit array. The quick (and dirty) fix to bswap the register value in gdb_cpu_setreg() as it has been added on i386 and amd64 can therefore be removed and has in fact been that. Tested on: alpha, amd64, i386, ia64, sparc64
2004-12-01 06:40:35 +00:00
register_t pc;
if (!gdb_rx_varhex(&addr)) {
pc = addr;
gdb_cpu_setreg(GDB_REG_PC, &pc);
}
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
kdb_cpu_set_singlestep();
add support for copying console messages to a remote gdb Reviewed by: kan
2006-03-23 23:06:14 +00:00
gdb_listening = 1;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
return (1);
}
case 'S': { /* Step with signal. */
uintmax_t addr, sig;
Change gdb_cpu_setreg() to not take the value to which to set the specified register, but a pointer to the in-memory representation of that value. The reason for this is twofold: 1. Not all registers can be represented by a register_t. In particular FP registers fall in that category. Passing the new register value by reference instead of by value makes this point moot. 2. When we receive a G or P packet, both are for writing a register, the packet will have the register value in target-byte order and in the memory representation (modulo the fact that bytes are sent as 2 printable hexadecimal numbers of course). We only need to decode the packet to have a pointer to the register value. This change fixes the bug of extracting the register value of the P packet as a hexadecimal number instead of as a bit array. The quick (and dirty) fix to bswap the register value in gdb_cpu_setreg() as it has been added on i386 and amd64 can therefore be removed and has in fact been that. Tested on: alpha, amd64, i386, ia64, sparc64
2004-12-01 06:40:35 +00:00
register_t pc;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' &&
Change gdb_cpu_setreg() to not take the value to which to set the specified register, but a pointer to the in-memory representation of that value. The reason for this is twofold: 1. Not all registers can be represented by a register_t. In particular FP registers fall in that category. Passing the new register value by reference instead of by value makes this point moot. 2. When we receive a G or P packet, both are for writing a register, the packet will have the register value in target-byte order and in the memory representation (modulo the fact that bytes are sent as 2 printable hexadecimal numbers of course). We only need to decode the packet to have a pointer to the register value. This change fixes the bug of extracting the register value of the P packet as a hexadecimal number instead of as a bit array. The quick (and dirty) fix to bswap the register value in gdb_cpu_setreg() as it has been added on i386 and amd64 can therefore be removed and has in fact been that. Tested on: alpha, amd64, i386, ia64, sparc64
2004-12-01 06:40:35 +00:00
!gdb_rx_varhex(&addr)) {
pc = addr;
gdb_cpu_setreg(GDB_REG_PC, &pc);
}
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
kdb_cpu_set_singlestep();
add support for copying console messages to a remote gdb Reviewed by: kan
2006-03-23 23:06:14 +00:00
gdb_listening = 1;
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
return (1);
}
case 'T': { /* Thread alive. */
intmax_t tid;
check return value of gdb_rx_varhex Noticed by: Coverity Prevent analysis tool Reviewed by: kan
2005-03-28 18:31:18 +00:00
if (gdb_rx_varhex(&tid)) {
gdb_tx_err(EINVAL);
break;
}
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
if (kdb_thr_lookup(tid) != NULL)
gdb_tx_ok();
else
gdb_tx_err(ENOENT);
break;
}
case -1:
/* Empty command. Treat as unknown command. */
/* FALLTHROUGH */
default:
/* Unknown command. Send empty response. */
gdb_tx_empty();
break;
}
}
Modify kdb_trap() so that it re-calls the dbbe_trap function as long as the debugger back-end has changed. This means that switching from ddb to gdb no longer requires a "step" which can be dangerous on an already-crashed kernel. Also add a capability to get from the gdb back-end back to ddb, by typing ^C in the console window. While here, simplify kdb_sysctl_available() by using sbuf_new_for_sysctl(), and use strlcpy() instead of strncpy() since the strlcpy semantic is desired. MFC after: 1 month
2011-02-18 22:25:11 +00:00
(void)kdb_jmpbuf(prev_jb);
Introduce the GDB debugger backend for the new KDB framework. The backend improves over the old GDB support in the following ways: o Unified implementation with minimal MD code. o A simple interface for devices to register themselves as debug ports, ala consoles. o Compression by using run-length encoding. o Implements GDB threading support.
2004-07-10 17:47:22 +00:00
return (0);
}
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