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backup gdbstub.

This commit is contained in:
Colin 2025-09-22 02:34:54 +00:00
parent 5f7b8ee030
commit b15fc411b3
17 changed files with 4312 additions and 1 deletions
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3
.vscode/settings.json vendored
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@ -2,6 +2,7 @@
"files.associations": { "files.associations": {
"BUILD": "bazel", "BUILD": "bazel",
"*.inc": "cpp", "*.inc": "cpp",
"stdio.h": "c" "stdio.h": "c",
"cstdlib": "c"
} }
} }

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backup/commands.h Normal file
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#ifndef GDBSTUB_COMMANDS_H
#define GDBSTUB_COMMANDS_H
typedef void (*GdbCmdHandler)(GArray *params, void *user_ctx);
typedef enum GDBThreadIdKind {
GDB_ONE_THREAD = 0,
GDB_ALL_THREADS, /* One process, all threads */
GDB_ALL_PROCESSES,
GDB_READ_THREAD_ERR
} GDBThreadIdKind;
typedef union GdbCmdVariant {
const char *data;
uint8_t opcode;
unsigned long val_ul;
unsigned long long val_ull;
struct {
GDBThreadIdKind kind;
uint32_t pid;
uint32_t tid;
} thread_id;
} GdbCmdVariant;
#define gdb_get_cmd_param(p, i) (&g_array_index(p, GdbCmdVariant, i))
/**
* typedef GdbCmdParseEntry - gdb command parser
*
* This structure keeps the information necessary to match a gdb command,
* parse it (extract its parameters), and select the correct handler for it.
*
* @cmd: The command to be matched
* @cmd_startswith: If true, @cmd is compared using startswith
* @schema: Each schema for the command parameter entry consists of 2 chars,
* the first char represents the parameter type handling the second char
* represents the delimiter for the next parameter.
*
* Currently supported schema types:
* 'l' -> unsigned long (stored in .val_ul)
* 'L' -> unsigned long long (stored in .val_ull)
* 's' -> string (stored in .data)
* 'o' -> single char (stored in .opcode)
* 't' -> thread id (stored in .thread_id)
* '?' -> skip according to delimiter
*
* Currently supported delimiters:
* '?' -> Stop at any delimiter (",;:=\0")
* '0' -> Stop at "\0"
* '.' -> Skip 1 char unless reached "\0"
* Any other value is treated as the delimiter value itself
*
* @allow_stop_reply: True iff the gdbstub can respond to this command with a
* "stop reply" packet. The list of commands that accept such response is
* defined at the GDB Remote Serial Protocol documentation. See:
* https://sourceware.org/gdb/onlinedocs/gdb/Stop-Reply-Packets.html#Stop-Reply-Packets.
*
* @need_cpu_context: Pass current CPU context to command handler via user_ctx.
*/
typedef struct GdbCmdParseEntry {
GdbCmdHandler handler;
const char *cmd;
bool cmd_startswith;
const char *schema;
bool allow_stop_reply;
bool need_cpu_context;
} GdbCmdParseEntry;
/**
* gdb_put_packet() - put string into gdb server's buffer so it is sent
* to the client
*/
int gdb_put_packet(const char *buf);
/**
* gdb_extend_query_table() - Extend query table.
* @table: GPtrArray of GdbCmdParseEntry entries.
*
* The caller should free @table afterwards
*/
void gdb_extend_query_table(GPtrArray *table);
/**
* gdb_extend_set_table() - Extend set table.
* @table: GPtrArray of GdbCmdParseEntry entries.
*
* The caller should free @table afterwards
*/
void gdb_extend_set_table(GPtrArray *table);
/**
* gdb_extend_qsupported_features() - Extend the qSupported features string.
* @qsupported_features: The additional qSupported feature(s) string. The string
* should start with a semicolon and, if there are more than one feature, the
* features should be separate by a semicolon.
*
* The caller should free @qsupported_features afterwards if
* dynamically allocated.
*/
void gdb_extend_qsupported_features(char *qsupported_features);
/**
* Convert a hex string to bytes. Conversion is done per byte, so 2 hex digits
* are converted to 1 byte. Invalid hex digits are treated as 0 digits.
*/
void gdb_hextomem(GByteArray *mem, const char *buf, int len);
#endif /* GDBSTUB_COMMANDS_H */

21
backup/enums.h Normal file
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/*
* gdbstub enums
*
* Copyright (c) 2024 Linaro Ltd
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef GDBSTUB_ENUMS_H
#define GDBSTUB_ENUMS_H
#define DEFAULT_GDBSTUB_PORT "1234"
/* GDB breakpoint/watchpoint types */
#define GDB_BREAKPOINT_SW 0
#define GDB_BREAKPOINT_HW 1
#define GDB_WATCHPOINT_WRITE 2
#define GDB_WATCHPOINT_READ 3
#define GDB_WATCHPOINT_ACCESS 4
#endif /* GDBSTUB_ENUMS_H */

2519
backup/gdbstub.c Normal file
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164
backup/gdbstub.h Normal file
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#ifndef GDBSTUB_H
#define GDBSTUB_H
typedef struct GDBFeature {
const char *xmlname;
const char *xml;
const char *name;
const char * const *regs;
int num_regs;
} GDBFeature;
typedef struct GDBFeatureBuilder {
GDBFeature *feature;
GPtrArray *xml;
GPtrArray *regs;
int base_reg;
} GDBFeatureBuilder;
/* Get or set a register. Returns the size of the register. */
typedef int (*gdb_get_reg_cb)(CPUState *cpu, GByteArray *buf, int reg);
typedef int (*gdb_set_reg_cb)(CPUState *cpu, uint8_t *buf, int reg);
/**
* gdb_init_cpu(): Initialize the CPU for gdbstub.
* @cpu: The CPU to be initialized.
*/
void gdb_init_cpu(CPUState *cpu);
/**
* gdb_register_coprocessor() - register a supplemental set of registers
* @cpu - the CPU associated with registers
* @get_reg - get function (gdb reading)
* @set_reg - set function (gdb modifying)
* @num_regs - number of registers in set
* @xml - xml name of set
* @gpos - non-zero to append to "general" register set at @gpos
*/
void gdb_register_coprocessor(CPUState *cpu,
gdb_get_reg_cb get_reg, gdb_set_reg_cb set_reg,
const GDBFeature *feature, int g_pos);
/**
* gdb_unregister_coprocessor_all() - unregisters supplemental set of registers
* @cpu - the CPU associated with registers
*/
void gdb_unregister_coprocessor_all(CPUState *cpu);
/**
* gdbserver_start: start the gdb server
* @port_or_device: connection spec for gdb
* @errp: error handle
*
* For CONFIG_USER this is either a tcp port or a path to a fifo. For
* system emulation you can use a full chardev spec for your gdbserver
* port.
*
* The error handle should be either &error_fatal (for start-up) or
* &error_warn (for QMP/HMP initiated sessions).
*
* Returns true when server successfully started.
*/
bool gdbserver_start(const char *port_or_device, Error **errp);
/**
* gdb_feature_builder_init() - Initialize GDBFeatureBuilder.
* @builder: The builder to be initialized.
* @feature: The feature to be filled.
* @name: The name of the feature.
* @xmlname: The name of the XML.
* @base_reg: The base number of the register ID.
*/
void gdb_feature_builder_init(GDBFeatureBuilder *builder, GDBFeature *feature,
const char *name, const char *xmlname,
int base_reg);
/**
* gdb_feature_builder_append_tag() - Append a tag.
* @builder: The builder.
* @format: The format of the tag.
* @...: The values to be formatted.
*/
void G_GNUC_PRINTF(2, 3)
gdb_feature_builder_append_tag(const GDBFeatureBuilder *builder,
const char *format, ...);
/**
* gdb_feature_builder_append_reg() - Append a register.
* @builder: The builder.
* @name: The register's name; it must be unique within a CPU.
* @bitsize: The register's size, in bits.
* @regnum: The offset of the register's number in the feature.
* @type: The type of the register.
* @group: The register group to which this register belongs; it can be NULL.
*/
void gdb_feature_builder_append_reg(const GDBFeatureBuilder *builder,
const char *name,
int bitsize,
int regnum,
const char *type,
const char *group);
/**
* gdb_feature_builder_end() - End building GDBFeature.
* @builder: The builder.
*/
void gdb_feature_builder_end(const GDBFeatureBuilder *builder);
/**
* gdb_find_static_feature() - Find a static feature.
* @xmlname: The name of the XML.
*
* Return: The static feature.
*/
const GDBFeature *gdb_find_static_feature(const char *xmlname);
/**
* gdb_read_register() - Read a register associated with a CPU.
* @cpu: The CPU associated with the register.
* @buf: The buffer that the read register will be appended to.
* @reg: The register's number returned by gdb_find_feature_register().
*
* Return: The number of read bytes.
*/
int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
/**
* gdb_write_register() - Write a register associated with a CPU.
* @cpu: The CPU associated with the register.
* @buf: The buffer that the register contents will be set to.
* @reg: The register's number returned by gdb_find_feature_register().
*
* The size of @buf must be at least the size of the register being
* written.
*
* Return: The number of written bytes, or 0 if an error occurred (for
* example, an unknown register was provided).
*/
int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg);
/**
* typedef GDBRegDesc - a register description from gdbstub
*/
typedef struct {
int gdb_reg;
const char *name;
const char *feature_name;
} GDBRegDesc;
/**
* gdb_get_register_list() - Return list of all registers for CPU
* @cpu: The CPU being searched
*
* Returns a GArray of GDBRegDesc, caller frees array but not the
* const strings.
*/
GArray *gdb_get_register_list(CPUState *cpu);
void gdb_set_stop_cpu(CPUState *cpu);
/* in gdbstub-xml.c, generated by scripts/feature_to_c.py */
extern const GDBFeature gdb_static_features[];
#endif /* GDBSTUB_H */

0
gdbstub/helpers.h → backup/helpers.h
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240
backup/internals.h Normal file
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/*
* gdbstub internals
*
* Copyright (c) 2022 Linaro Ltd
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef GDBSTUB_INTERNALS_H
#define GDBSTUB_INTERNALS_H
#include "exec/cpu-common.h"
/*
* Most "large" transfers (e.g. memory reads, feature XML
* transfer) have mechanisms in the gdb protocol for splitting
* them. However, register values in particular cannot currently
* be split. This packet size must therefore be at least big enough
* for the worst-case register size. Currently that is Arm SME
* ZA storage with a 256x256 byte value. We also must account
* for the conversion from raw data to hex in gdb_memtohex(),
* which writes 2 * size bytes, and for other protocol overhead
* including command, register number and checksum which add
* another 4 bytes of overhead. However, to be consistent with
* the changes made in gdbserver to address this same requirement,
* we add a total of 32 bytes to account for protocol overhead
* (unclear why specifically 32 bytes), bringing the value of
* MAX_PACKET_LENGTH to 2 * 256 * 256 + 32 = 131104.
*
* The commit making this change for gdbserver can be found here:
* https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=
* b816042e88583f280ad186ff124ab84d31fb592b
*/
#define MAX_PACKET_LENGTH 131104
/*
* Shared structures and definitions
*/
enum {
GDB_SIGNAL_0 = 0,
GDB_SIGNAL_INT = 2,
GDB_SIGNAL_QUIT = 3,
GDB_SIGNAL_TRAP = 5,
GDB_SIGNAL_ABRT = 6,
GDB_SIGNAL_ALRM = 14,
GDB_SIGNAL_STOP = 17,
GDB_SIGNAL_IO = 23,
GDB_SIGNAL_XCPU = 24,
GDB_SIGNAL_UNKNOWN = 143
};
typedef struct GDBProcess {
uint32_t pid;
bool attached;
char *target_xml;
} GDBProcess;
enum RSState {
RS_INACTIVE,
RS_IDLE,
RS_GETLINE,
RS_GETLINE_ESC,
RS_GETLINE_RLE,
RS_CHKSUM1,
RS_CHKSUM2,
};
typedef struct GDBState {
bool init; /* have we been initialised? */
CPUState *c_cpu; /* current CPU for step/continue ops */
CPUState *g_cpu; /* current CPU for other ops */
CPUState *query_cpu; /* for q{f|s}ThreadInfo */
enum RSState state; /* parsing state */
char line_buf[MAX_PACKET_LENGTH];
int line_buf_index;
int line_sum; /* running checksum */
int line_csum; /* checksum at the end of the packet */
GByteArray *last_packet;
int signal;
bool multiprocess;
GDBProcess *processes;
int process_num;
GString *str_buf;
GByteArray *mem_buf;
int sstep_flags;
int supported_sstep_flags;
/*
* Whether we are allowed to send a stop reply packet at this moment.
* Must be set off after sending the stop reply itself.
*/
bool allow_stop_reply;
} GDBState;
/* lives in main gdbstub.c */
extern GDBState gdbserver_state;
/*
* Inline utility function, convert from int to hex and back
*/
static inline int fromhex(int v)
{
if (v >= '0' && v <= '9') {
return v - '0';
} else if (v >= 'A' && v <= 'F') {
return v - 'A' + 10;
} else if (v >= 'a' && v <= 'f') {
return v - 'a' + 10;
} else {
return 0;
}
}
static inline int tohex(int v)
{
if (v < 10) {
return v + '0';
} else {
return v - 10 + 'a';
}
}
/*
* Connection helpers for both system and user backends
*/
void gdb_put_strbuf(void);
int gdb_put_packet_binary(const char *buf, int len, bool dump);
void gdb_memtohex(GString *buf, const uint8_t *mem, int len);
void gdb_memtox(GString *buf, const char *mem, int len);
void gdb_read_byte(uint8_t ch);
/*
* Packet acknowledgement - we handle this slightly differently
* between user and system mode, mainly to deal with the differences
* between the flexible chardev and the direct fd approaches.
*
* We currently don't support a negotiated QStartNoAckMode
*/
/**
* gdb_got_immediate_ack() - check ok to continue
*
* Returns true to continue, false to re-transmit for user only, the
* system stub always returns true.
*/
bool gdb_got_immediate_ack(void);
/* utility helpers */
GDBProcess *gdb_get_process(uint32_t pid);
CPUState *gdb_get_first_cpu_in_process(GDBProcess *process);
CPUState *gdb_first_attached_cpu(void);
void gdb_append_thread_id(CPUState *cpu, GString *buf);
int gdb_get_cpu_index(CPUState *cpu);
unsigned int gdb_get_max_cpus(void); /* both */
bool gdb_can_reverse(void); /* system emulation, stub for user */
int gdb_target_sigtrap(void); /* user */
void gdb_create_default_process(GDBState *s);
/* signal mapping, common for system, specialised for user-mode */
int gdb_signal_to_target(int sig);
int gdb_target_signal_to_gdb(int sig);
int gdb_get_char(void); /* user only */
/**
* gdb_continue() - handle continue in mode specific way.
*/
void gdb_continue(void);
/**
* gdb_continue_partial() - handle partial continue in mode specific way.
*/
int gdb_continue_partial(char *newstates);
/*
* Helpers with separate system and user implementations
*/
void gdb_put_buffer(const uint8_t *buf, int len);
/*
* Command handlers - either specialised or system or user only
*/
void gdb_init_gdbserver_state(void);
void gdb_handle_query_rcmd(GArray *params, void *ctx); /* system */
void gdb_handle_query_offsets(GArray *params, void *user_ctx); /* user */
void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx); /*user */
void gdb_handle_query_xfer_siginfo(GArray *params, void *user_ctx); /*user */
void gdb_handle_v_file_open(GArray *params, void *user_ctx); /* user */
void gdb_handle_v_file_close(GArray *params, void *user_ctx); /* user */
void gdb_handle_v_file_pread(GArray *params, void *user_ctx); /* user */
void gdb_handle_v_file_readlink(GArray *params, void *user_ctx); /* user */
void gdb_handle_query_xfer_exec_file(GArray *params, void *user_ctx); /* user */
void gdb_handle_set_catch_syscalls(GArray *params, void *user_ctx); /* user */
void gdb_handle_query_supported_user(const char *gdb_supported); /* user */
bool gdb_handle_set_thread_user(uint32_t pid, uint32_t tid); /* user */
bool gdb_handle_detach_user(uint32_t pid); /* user */
void gdb_handle_query_attached(GArray *params, void *ctx); /* both */
/* system only */
void gdb_handle_query_qemu_phy_mem_mode(GArray *params, void *ctx);
void gdb_handle_set_qemu_phy_mem_mode(GArray *params, void *ctx);
/* sycall handling */
void gdb_handle_file_io(GArray *params, void *user_ctx);
bool gdb_handled_syscall(void);
void gdb_disable_syscalls(void);
void gdb_syscall_reset(void);
/* user/system specific syscall handling */
void gdb_syscall_handling(const char *syscall_packet);
/*
* Break/Watch point support - there is an implementation for system
* and user mode.
*/
bool gdb_supports_guest_debug(void);
int gdb_breakpoint_insert(CPUState *cs, int type, vaddr addr, vaddr len);
int gdb_breakpoint_remove(CPUState *cs, int type, vaddr addr, vaddr len);
void gdb_breakpoint_remove_all(CPUState *cs);
/**
* gdb_target_memory_rw_debug() - handle debug access to memory
* @cs: CPUState
* @addr: nominal address, could be an entire physical address
* @buf: data
* @len: length of access
* @is_write: is it a write operation
*
* This function is specialised depending on the mode we are running
* in. For system guests we can switch the interpretation of the
* address to a physical address.
*/
int gdb_target_memory_rw_debug(CPUState *cs, hwaddr addr,
uint8_t *buf, int len, bool is_write);
#endif /* GDBSTUB_INTERNALS_H */

0
gdbstub/meson.build → backup/meson.build
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0
gdbstub/syscalls.c → backup/syscalls.c
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0
gdbstub/syscalls.h → backup/syscalls.h
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669
backup/system.c Normal file
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/*
* gdb server stub - system specific bits
*
* Debug integration depends on support from the individual
* accelerators so most of this involves calling the ops helpers.
*
* Copyright (c) 2003-2005 Fabrice Bellard
* Copyright (c) 2022 Linaro Ltd
*
* SPDX-License-Identifier: LGPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/cutils.h"
#include "exec/gdbstub.h"
#include "gdbstub/syscalls.h"
#include "gdbstub/commands.h"
#include "exec/hwaddr.h"
#include "exec/tb-flush.h"
#include "accel/accel-ops.h"
#include "accel/accel-cpu-ops.h"
#include "system/cpus.h"
#include "system/runstate.h"
#include "system/replay.h"
#include "system/tcg.h"
#include "hw/core/cpu.h"
#include "hw/cpu/cluster.h"
#include "hw/boards.h"
#include "chardev/char.h"
#include "chardev/char-fe.h"
#include "monitor/monitor.h"
#include "trace.h"
#include "internals.h"
/* System emulation specific state */
typedef struct {
CharBackend chr;
Chardev *mon_chr;
} GDBSystemState;
GDBSystemState gdbserver_system_state;
static void reset_gdbserver_state(void)
{
g_free(gdbserver_state.processes);
gdbserver_state.processes = NULL;
gdbserver_state.process_num = 0;
gdbserver_state.allow_stop_reply = false;
}
/*
* Return the GDB index for a given vCPU state.
*
* In system mode GDB numbers CPUs from 1 as 0 is reserved as an "any
* cpu" index.
*/
int gdb_get_cpu_index(CPUState *cpu)
{
return cpu->cpu_index + 1;
}
/*
* We check the status of the last message in the chardev receive code
*/
bool gdb_got_immediate_ack(void)
{
return true;
}
/*
* GDB Connection management. For system emulation we do all of this
* via our existing Chardev infrastructure which allows us to support
* network and unix sockets.
*/
void gdb_put_buffer(const uint8_t *buf, int len)
{
/*
* XXX this blocks entire thread. Rewrite to use
* qemu_chr_fe_write and background I/O callbacks
*/
qemu_chr_fe_write_all(&gdbserver_system_state.chr, buf, len);
}
static void gdb_chr_event(void *opaque, QEMUChrEvent event)
{
int i;
GDBState *s = (GDBState *) opaque;
switch (event) {
case CHR_EVENT_OPENED:
/* Start with first process attached, others detached */
for (i = 0; i < s->process_num; i++) {
s->processes[i].attached = !i;
}
s->c_cpu = gdb_first_attached_cpu();
s->g_cpu = s->c_cpu;
vm_stop(RUN_STATE_PAUSED);
replay_gdb_attached();
break;
default:
break;
}
}
/*
* In system-mode we stop the VM and wait to send the syscall packet
* until notification that the CPU has stopped. This must be done
* because if the packet is sent now the reply from the syscall
* request could be received while the CPU is still in the running
* state, which can cause packets to be dropped and state transition
* 'T' packets to be sent while the syscall is still being processed.
*/
void gdb_syscall_handling(const char *syscall_packet)
{
vm_stop(RUN_STATE_DEBUG);
qemu_cpu_kick(gdbserver_state.c_cpu);
}
static void gdb_vm_state_change(void *opaque, bool running, RunState state)
{
CPUState *cpu = gdbserver_state.c_cpu;
g_autoptr(GString) buf = g_string_new(NULL);
g_autoptr(GString) tid = g_string_new(NULL);
const char *type;
int ret;
if (running || gdbserver_state.state == RS_INACTIVE) {
return;
}
/* Is there a GDB syscall waiting to be sent? */
if (gdb_handled_syscall()) {
return;
}
if (cpu == NULL) {
/* No process attached */
return;
}
if (!gdbserver_state.allow_stop_reply) {
return;
}
gdb_append_thread_id(cpu, tid);
switch (state) {
case RUN_STATE_DEBUG:
if (cpu->watchpoint_hit) {
switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) {
case BP_MEM_READ:
type = "r";
break;
case BP_MEM_ACCESS:
type = "a";
break;
default:
type = "";
break;
}
trace_gdbstub_hit_watchpoint(type,
gdb_get_cpu_index(cpu),
cpu->watchpoint_hit->vaddr);
g_string_printf(buf, "T%02xthread:%s;%swatch:%" VADDR_PRIx ";",
GDB_SIGNAL_TRAP, tid->str, type,
cpu->watchpoint_hit->vaddr);
cpu->watchpoint_hit = NULL;
goto send_packet;
} else {
trace_gdbstub_hit_break();
}
if (tcg_enabled()) {
tb_flush(cpu);
}
ret = GDB_SIGNAL_TRAP;
break;
case RUN_STATE_PAUSED:
trace_gdbstub_hit_paused();
ret = GDB_SIGNAL_INT;
break;
case RUN_STATE_SHUTDOWN:
trace_gdbstub_hit_shutdown();
ret = GDB_SIGNAL_QUIT;
break;
case RUN_STATE_IO_ERROR:
trace_gdbstub_hit_io_error();
ret = GDB_SIGNAL_STOP;
break;
case RUN_STATE_WATCHDOG:
trace_gdbstub_hit_watchdog();
ret = GDB_SIGNAL_ALRM;
break;
case RUN_STATE_INTERNAL_ERROR:
trace_gdbstub_hit_internal_error();
ret = GDB_SIGNAL_ABRT;
break;
case RUN_STATE_SAVE_VM:
case RUN_STATE_RESTORE_VM:
return;
case RUN_STATE_FINISH_MIGRATE:
ret = GDB_SIGNAL_XCPU;
break;
default:
trace_gdbstub_hit_unknown(state);
ret = GDB_SIGNAL_UNKNOWN;
break;
}
gdb_set_stop_cpu(cpu);
g_string_printf(buf, "T%02xthread:%s;", ret, tid->str);
send_packet:
gdb_put_packet(buf->str);
gdbserver_state.allow_stop_reply = false;
/* disable single step if it was enabled */
cpu_single_step(cpu, 0);
}
#ifndef _WIN32
static void gdb_sigterm_handler(int signal)
{
if (runstate_is_running()) {
vm_stop(RUN_STATE_PAUSED);
}
}
#endif
static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len)
{
g_autoptr(GString) hex_buf = g_string_new("O");
gdb_memtohex(hex_buf, buf, len);
gdb_put_packet(hex_buf->str);
return len;
}
static void gdb_monitor_open(Chardev *chr, ChardevBackend *backend,
bool *be_opened, Error **errp)
{
*be_opened = false;
}
static void char_gdb_class_init(ObjectClass *oc, const void *data)
{
ChardevClass *cc = CHARDEV_CLASS(oc);
cc->internal = true;
cc->open = gdb_monitor_open;
cc->chr_write = gdb_monitor_write;
}
#define TYPE_CHARDEV_GDB "chardev-gdb"
static const TypeInfo char_gdb_type_info = {
.name = TYPE_CHARDEV_GDB,
.parent = TYPE_CHARDEV,
.class_init = char_gdb_class_init,
};
static int gdb_chr_can_receive(void *opaque)
{
/*
* We can handle an arbitrarily large amount of data.
* Pick the maximum packet size, which is as good as anything.
*/
return MAX_PACKET_LENGTH;
}
static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size)
{
int i;
for (i = 0; i < size; i++) {
gdb_read_byte(buf[i]);
}
}
static int find_cpu_clusters(Object *child, void *opaque)
{
if (object_dynamic_cast(child, TYPE_CPU_CLUSTER)) {
GDBState *s = (GDBState *) opaque;
CPUClusterState *cluster = CPU_CLUSTER(child);
GDBProcess *process;
s->processes = g_renew(GDBProcess, s->processes, ++s->process_num);
process = &s->processes[s->process_num - 1];
/*
* GDB process IDs -1 and 0 are reserved. To avoid subtle errors at
* runtime, we enforce here that the machine does not use a cluster ID
* that would lead to PID 0.
*/
assert(cluster->cluster_id != UINT32_MAX);
process->pid = cluster->cluster_id + 1;
process->attached = false;
process->target_xml = NULL;
return 0;
}
return object_child_foreach(child, find_cpu_clusters, opaque);
}
static int pid_order(const void *a, const void *b)
{
GDBProcess *pa = (GDBProcess *) a;
GDBProcess *pb = (GDBProcess *) b;
if (pa->pid < pb->pid) {
return -1;
} else if (pa->pid > pb->pid) {
return 1;
} else {
return 0;
}
}
static void create_processes(GDBState *s)
{
object_child_foreach(object_get_root(), find_cpu_clusters, s);
if (gdbserver_state.processes) {
/* Sort by PID */
qsort(gdbserver_state.processes,
gdbserver_state.process_num,
sizeof(gdbserver_state.processes[0]),
pid_order);
}
gdb_create_default_process(s);
}
bool gdbserver_start(const char *device, Error **errp)
{
Chardev *chr = NULL;
Chardev *mon_chr;
g_autoptr(GString) cs = g_string_new(device);
if (!first_cpu) {
error_setg(errp, "gdbstub: meaningless to attach gdb to a "
"machine without any CPU.");
return false;
}
if (!gdb_supports_guest_debug()) {
error_setg(errp, "gdbstub: current accelerator doesn't "
"support guest debugging");
return false;
}
if (cs->len == 0) {
error_setg(errp, "gdbstub: missing connection string");
return false;
}
trace_gdbstub_op_start(cs->str);
if (g_strcmp0(cs->str, "none") != 0) {
if (g_str_has_prefix(cs->str, "tcp:")) {
/* enforce required TCP attributes */
g_string_append_printf(cs, ",wait=off,nodelay=on,server=on");
}
#ifndef _WIN32
else if (strcmp(device, "stdio") == 0) {
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = gdb_sigterm_handler;
sigaction(SIGINT, &act, NULL);
}
#endif
/*
* FIXME: it's a bit weird to allow using a mux chardev here
* and implicitly setup a monitor. We may want to break this.
*/
chr = qemu_chr_new_noreplay("gdb", cs->str, true, NULL);
if (!chr) {
error_setg(errp, "gdbstub: couldn't create chardev");
return false;
}
}
if (!gdbserver_state.init) {
gdb_init_gdbserver_state();
qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL);
/* Initialize a monitor terminal for gdb */
mon_chr = qemu_chardev_new(NULL, TYPE_CHARDEV_GDB,
NULL, NULL, &error_abort);
monitor_init_hmp(mon_chr, false, &error_abort);
} else {
qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
mon_chr = gdbserver_system_state.mon_chr;
reset_gdbserver_state();
}
create_processes(&gdbserver_state);
if (chr) {
qemu_chr_fe_init(&gdbserver_system_state.chr, chr, &error_abort);
qemu_chr_fe_set_handlers(&gdbserver_system_state.chr,
gdb_chr_can_receive,
gdb_chr_receive, gdb_chr_event,
NULL, &gdbserver_state, NULL, true);
}
gdbserver_state.state = chr ? RS_IDLE : RS_INACTIVE;
gdbserver_system_state.mon_chr = mon_chr;
gdb_syscall_reset();
return true;
}
static void register_types(void)
{
type_register_static(&char_gdb_type_info);
}
type_init(register_types);
/* Tell the remote gdb that the process has exited. */
void gdb_exit(int code)
{
char buf[4];
if (!gdbserver_state.init) {
return;
}
trace_gdbstub_op_exiting((uint8_t)code);
if (gdbserver_state.allow_stop_reply) {
snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
gdb_put_packet(buf);
gdbserver_state.allow_stop_reply = false;
}
qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
}
void gdb_qemu_exit(int code)
{
qemu_system_shutdown_request_with_code(SHUTDOWN_CAUSE_GUEST_SHUTDOWN,
code);
}
/*
* Memory access
*/
static int phy_memory_mode;
int gdb_target_memory_rw_debug(CPUState *cpu, hwaddr addr,
uint8_t *buf, int len, bool is_write)
{
if (phy_memory_mode) {
if (is_write) {
cpu_physical_memory_write(addr, buf, len);
} else {
cpu_physical_memory_read(addr, buf, len);
}
return 0;
}
if (cpu->cc->memory_rw_debug) {
return cpu->cc->memory_rw_debug(cpu, addr, buf, len, is_write);
}
return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
}
/*
* cpu helpers
*/
unsigned int gdb_get_max_cpus(void)
{
MachineState *ms = MACHINE(qdev_get_machine());
return ms->smp.max_cpus;
}
bool gdb_can_reverse(void)
{
return replay_mode == REPLAY_MODE_PLAY;
}
/*
* Softmmu specific command helpers
*/
void gdb_handle_query_qemu_phy_mem_mode(GArray *params,
void *ctx)
{
g_string_printf(gdbserver_state.str_buf, "%d", phy_memory_mode);
gdb_put_strbuf();
}
void gdb_handle_set_qemu_phy_mem_mode(GArray *params, void *ctx)
{
if (!params->len) {
gdb_put_packet("E22");
return;
}
if (!gdb_get_cmd_param(params, 0)->val_ul) {
phy_memory_mode = 0;
} else {
phy_memory_mode = 1;
}
gdb_put_packet("OK");
}
void gdb_handle_query_rcmd(GArray *params, void *ctx)
{
const guint8 zero = 0;
int len;
if (!params->len) {
gdb_put_packet("E22");
return;
}
len = strlen(gdb_get_cmd_param(params, 0)->data);
if (len % 2) {
gdb_put_packet("E01");
return;
}
g_assert(gdbserver_state.mem_buf->len == 0);
len = len / 2;
gdb_hextomem(gdbserver_state.mem_buf, gdb_get_cmd_param(params, 0)->data, len);
g_byte_array_append(gdbserver_state.mem_buf, &zero, 1);
qemu_chr_be_write(gdbserver_system_state.mon_chr,
gdbserver_state.mem_buf->data,
gdbserver_state.mem_buf->len);
gdb_put_packet("OK");
}
/*
* Execution state helpers
*/
void gdb_handle_query_attached(GArray *params, void *ctx)
{
gdb_put_packet("1");
}
void gdb_continue(void)
{
if (!runstate_needs_reset()) {
trace_gdbstub_op_continue();
vm_start();
}
}
/*
* Resume execution, per CPU actions.
*/
int gdb_continue_partial(char *newstates)
{
CPUState *cpu;
int res = 0;
int flag = 0;
if (!runstate_needs_reset()) {
bool step_requested = false;
CPU_FOREACH(cpu) {
if (newstates[cpu->cpu_index] == 's') {
step_requested = true;
break;
}
}
if (vm_prepare_start(step_requested)) {
return 0;
}
CPU_FOREACH(cpu) {
switch (newstates[cpu->cpu_index]) {
case 0:
case 1:
break; /* nothing to do here */
case 's':
trace_gdbstub_op_stepping(cpu->cpu_index);
cpu_single_step(cpu, gdbserver_state.sstep_flags);
cpu_resume(cpu);
flag = 1;
break;
case 'c':
trace_gdbstub_op_continue_cpu(cpu->cpu_index);
cpu_resume(cpu);
flag = 1;
break;
default:
res = -1;
break;
}
}
}
if (flag) {
qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
}
return res;
}
/*
* Signal Handling - in system mode we only need SIGINT and SIGTRAP; other
* signals are not yet supported.
*/
enum {
TARGET_SIGINT = 2,
TARGET_SIGTRAP = 5
};
int gdb_signal_to_target(int sig)
{
switch (sig) {
case 2:
return TARGET_SIGINT;
case 5:
return TARGET_SIGTRAP;
default:
return -1;
}
}
/*
* Break/Watch point helpers
*/
bool gdb_supports_guest_debug(void)
{
const AccelOpsClass *ops = cpus_get_accel();
if (ops->supports_guest_debug) {
return ops->supports_guest_debug();
}
return false;
}
int gdb_breakpoint_insert(CPUState *cs, int type, vaddr addr, vaddr len)
{
const AccelOpsClass *ops = cpus_get_accel();
if (ops->insert_breakpoint) {
return ops->insert_breakpoint(cs, type, addr, len);
}
return -ENOSYS;
}
int gdb_breakpoint_remove(CPUState *cs, int type, vaddr addr, vaddr len)
{
const AccelOpsClass *ops = cpus_get_accel();
if (ops->remove_breakpoint) {
return ops->remove_breakpoint(cs, type, addr, len);
}
return -ENOSYS;
}
void gdb_breakpoint_remove_all(CPUState *cs)
{
const AccelOpsClass *ops = cpus_get_accel();
if (ops->remove_all_breakpoints) {
ops->remove_all_breakpoints(cs);
}
}

0
gdbstub/trace-events → backup/trace-events
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1
backup/trace.h Normal file
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@ -0,0 +1 @@
#include "trace/trace-gdbstub.h"

424
backup/user-target.c Normal file
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@ -0,0 +1,424 @@
/*
* Target specific user-mode handling
*
* Copyright (c) 2003-2005 Fabrice Bellard
* Copyright (c) 2022 Linaro Ltd
*
* SPDX-License-Identifier: LGPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "exec/gdbstub.h"
#include "gdbstub/commands.h"
#include "qemu.h"
#include "internals.h"
#ifdef CONFIG_LINUX
#include "linux-user/loader.h"
#include "linux-user/qemu.h"
#endif
/*
* Map target signal numbers to GDB protocol signal numbers and vice
* versa. For user emulation's currently supported systems, we can
* assume most signals are defined.
*/
static int gdb_signal_table[] = {
0,
TARGET_SIGHUP,
TARGET_SIGINT,
TARGET_SIGQUIT,
TARGET_SIGILL,
TARGET_SIGTRAP,
TARGET_SIGABRT,
-1, /* SIGEMT */
TARGET_SIGFPE,
TARGET_SIGKILL,
TARGET_SIGBUS,
TARGET_SIGSEGV,
TARGET_SIGSYS,
TARGET_SIGPIPE,
TARGET_SIGALRM,
TARGET_SIGTERM,
TARGET_SIGURG,
TARGET_SIGSTOP,
TARGET_SIGTSTP,
TARGET_SIGCONT,
TARGET_SIGCHLD,
TARGET_SIGTTIN,
TARGET_SIGTTOU,
TARGET_SIGIO,
TARGET_SIGXCPU,
TARGET_SIGXFSZ,
TARGET_SIGVTALRM,
TARGET_SIGPROF,
TARGET_SIGWINCH,
-1, /* SIGLOST */
TARGET_SIGUSR1,
TARGET_SIGUSR2,
#ifdef TARGET_SIGPWR
TARGET_SIGPWR,
#else
-1,
#endif
-1, /* SIGPOLL */
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
#ifdef __SIGRTMIN
__SIGRTMIN + 1,
__SIGRTMIN + 2,
__SIGRTMIN + 3,
__SIGRTMIN + 4,
__SIGRTMIN + 5,
__SIGRTMIN + 6,
__SIGRTMIN + 7,
__SIGRTMIN + 8,
__SIGRTMIN + 9,
__SIGRTMIN + 10,
__SIGRTMIN + 11,
__SIGRTMIN + 12,
__SIGRTMIN + 13,
__SIGRTMIN + 14,
__SIGRTMIN + 15,
__SIGRTMIN + 16,
__SIGRTMIN + 17,
__SIGRTMIN + 18,
__SIGRTMIN + 19,
__SIGRTMIN + 20,
__SIGRTMIN + 21,
__SIGRTMIN + 22,
__SIGRTMIN + 23,
__SIGRTMIN + 24,
__SIGRTMIN + 25,
__SIGRTMIN + 26,
__SIGRTMIN + 27,
__SIGRTMIN + 28,
__SIGRTMIN + 29,
__SIGRTMIN + 30,
__SIGRTMIN + 31,
-1, /* SIGCANCEL */
__SIGRTMIN,
__SIGRTMIN + 32,
__SIGRTMIN + 33,
__SIGRTMIN + 34,
__SIGRTMIN + 35,
__SIGRTMIN + 36,
__SIGRTMIN + 37,
__SIGRTMIN + 38,
__SIGRTMIN + 39,
__SIGRTMIN + 40,
__SIGRTMIN + 41,
__SIGRTMIN + 42,
__SIGRTMIN + 43,
__SIGRTMIN + 44,
__SIGRTMIN + 45,
__SIGRTMIN + 46,
__SIGRTMIN + 47,
__SIGRTMIN + 48,
__SIGRTMIN + 49,
__SIGRTMIN + 50,
__SIGRTMIN + 51,
__SIGRTMIN + 52,
__SIGRTMIN + 53,
__SIGRTMIN + 54,
__SIGRTMIN + 55,
__SIGRTMIN + 56,
__SIGRTMIN + 57,
__SIGRTMIN + 58,
__SIGRTMIN + 59,
__SIGRTMIN + 60,
__SIGRTMIN + 61,
__SIGRTMIN + 62,
__SIGRTMIN + 63,
__SIGRTMIN + 64,
__SIGRTMIN + 65,
__SIGRTMIN + 66,
__SIGRTMIN + 67,
__SIGRTMIN + 68,
__SIGRTMIN + 69,
__SIGRTMIN + 70,
__SIGRTMIN + 71,
__SIGRTMIN + 72,
__SIGRTMIN + 73,
__SIGRTMIN + 74,
__SIGRTMIN + 75,
__SIGRTMIN + 76,
__SIGRTMIN + 77,
__SIGRTMIN + 78,
__SIGRTMIN + 79,
__SIGRTMIN + 80,
__SIGRTMIN + 81,
__SIGRTMIN + 82,
__SIGRTMIN + 83,
__SIGRTMIN + 84,
__SIGRTMIN + 85,
__SIGRTMIN + 86,
__SIGRTMIN + 87,
__SIGRTMIN + 88,
__SIGRTMIN + 89,
__SIGRTMIN + 90,
__SIGRTMIN + 91,
__SIGRTMIN + 92,
__SIGRTMIN + 93,
__SIGRTMIN + 94,
__SIGRTMIN + 95,
-1, /* SIGINFO */
-1, /* UNKNOWN */
-1, /* DEFAULT */
-1,
-1,
-1,
-1,
-1,
-1
#endif
};
int gdb_signal_to_target(int sig)
{
if (sig < ARRAY_SIZE(gdb_signal_table)) {
return gdb_signal_table[sig];
} else {
return -1;
}
}
int gdb_target_signal_to_gdb(int sig)
{
int i;
for (i = 0; i < ARRAY_SIZE(gdb_signal_table); i++) {
if (gdb_signal_table[i] == sig) {
return i;
}
}
return GDB_SIGNAL_UNKNOWN;
}
int gdb_get_cpu_index(CPUState *cpu)
{
TaskState *ts = get_task_state(cpu);
return ts ? ts->ts_tid : -1;
}
/*
* User-mode specific command helpers
*/
void gdb_handle_query_offsets(GArray *params, void *user_ctx)
{
TaskState *ts;
ts = get_task_state(gdbserver_state.c_cpu);
g_string_printf(gdbserver_state.str_buf,
"Text=" TARGET_ABI_FMT_lx
";Data=" TARGET_ABI_FMT_lx
";Bss=" TARGET_ABI_FMT_lx,
ts->info->code_offset,
ts->info->data_offset,
ts->info->data_offset);
gdb_put_strbuf();
}
#if defined(CONFIG_LINUX)
/* Partial user only duplicate of helper in gdbstub.c */
static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
uint8_t *buf, int len, bool is_write)
{
if (cpu->cc->memory_rw_debug) {
return cpu->cc->memory_rw_debug(cpu, addr, buf, len, is_write);
}
return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
}
void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx)
{
TaskState *ts;
unsigned long offset, len, saved_auxv, auxv_len;
if (params->len < 2) {
gdb_put_packet("E22");
return;
}
offset = gdb_get_cmd_param(params, 0)->val_ul;
len = gdb_get_cmd_param(params, 1)->val_ul;
ts = get_task_state(gdbserver_state.c_cpu);
saved_auxv = ts->info->saved_auxv;
auxv_len = ts->info->auxv_len;
if (offset >= auxv_len) {
gdb_put_packet("E00");
return;
}
if (len > (MAX_PACKET_LENGTH - 5) / 2) {
len = (MAX_PACKET_LENGTH - 5) / 2;
}
if (len < auxv_len - offset) {
g_string_assign(gdbserver_state.str_buf, "m");
} else {
g_string_assign(gdbserver_state.str_buf, "l");
len = auxv_len - offset;
}
g_byte_array_set_size(gdbserver_state.mem_buf, len);
if (target_memory_rw_debug(gdbserver_state.g_cpu, saved_auxv + offset,
gdbserver_state.mem_buf->data, len, false)) {
gdb_put_packet("E14");
return;
}
gdb_memtox(gdbserver_state.str_buf,
(const char *)gdbserver_state.mem_buf->data, len);
gdb_put_packet_binary(gdbserver_state.str_buf->str,
gdbserver_state.str_buf->len, true);
}
#endif
static const char *get_filename_param(GArray *params, int i)
{
const char *hex_filename = gdb_get_cmd_param(params, i)->data;
gdb_hextomem(gdbserver_state.mem_buf, hex_filename,
strlen(hex_filename) / 2);
g_byte_array_append(gdbserver_state.mem_buf, (const guint8 *)"", 1);
return (const char *)gdbserver_state.mem_buf->data;
}
static void hostio_reply_with_data(const void *buf, size_t n)
{
g_string_printf(gdbserver_state.str_buf, "F%zx;", n);
gdb_memtox(gdbserver_state.str_buf, buf, n);
gdb_put_packet_binary(gdbserver_state.str_buf->str,
gdbserver_state.str_buf->len, true);
}
void gdb_handle_v_file_open(GArray *params, void *user_ctx)
{
const char *filename = get_filename_param(params, 0);
uint64_t flags = gdb_get_cmd_param(params, 1)->val_ull;
uint64_t mode = gdb_get_cmd_param(params, 2)->val_ull;
#ifdef CONFIG_LINUX
int fd = do_guest_openat(cpu_env(gdbserver_state.g_cpu), 0, filename,
flags, mode, false);
#else
int fd = open(filename, flags, mode);
#endif
if (fd < 0) {
g_string_printf(gdbserver_state.str_buf, "F-1,%x", errno);
} else {
g_string_printf(gdbserver_state.str_buf, "F%x", fd);
}
gdb_put_strbuf();
}
void gdb_handle_v_file_close(GArray *params, void *user_ctx)
{
int fd = gdb_get_cmd_param(params, 0)->val_ul;
if (close(fd) == -1) {
g_string_printf(gdbserver_state.str_buf, "F-1,%x", errno);
gdb_put_strbuf();
return;
}
gdb_put_packet("F00");
}
void gdb_handle_v_file_pread(GArray *params, void *user_ctx)
{
int fd = gdb_get_cmd_param(params, 0)->val_ul;
size_t count = gdb_get_cmd_param(params, 1)->val_ull;
off_t offset = gdb_get_cmd_param(params, 2)->val_ull;
size_t bufsiz = MIN(count, BUFSIZ);
g_autofree char *buf = g_try_malloc(bufsiz);
if (buf == NULL) {
gdb_put_packet("E12");
return;
}
ssize_t n = pread(fd, buf, bufsiz, offset);
if (n < 0) {
g_string_printf(gdbserver_state.str_buf, "F-1,%x", errno);
gdb_put_strbuf();
return;
}
hostio_reply_with_data(buf, n);
}
void gdb_handle_v_file_readlink(GArray *params, void *user_ctx)
{
const char *filename = get_filename_param(params, 0);
g_autofree char *buf = g_try_malloc(BUFSIZ);
if (buf == NULL) {
gdb_put_packet("E12");
return;
}
#ifdef CONFIG_LINUX
ssize_t n = do_guest_readlink(filename, buf, BUFSIZ);
#else
ssize_t n = readlink(filename, buf, BUFSIZ);
#endif
if (n < 0) {
g_string_printf(gdbserver_state.str_buf, "F-1,%x", errno);
gdb_put_strbuf();
return;
}
hostio_reply_with_data(buf, n);
}
void gdb_handle_query_xfer_exec_file(GArray *params, void *user_ctx)
{
uint32_t pid = gdb_get_cmd_param(params, 0)->val_ul;
uint32_t offset = gdb_get_cmd_param(params, 1)->val_ul;
uint32_t length = gdb_get_cmd_param(params, 2)->val_ul;
GDBProcess *process = gdb_get_process(pid);
if (!process) {
gdb_put_packet("E00");
return;
}
CPUState *cpu = gdb_get_first_cpu_in_process(process);
if (!cpu) {
gdb_put_packet("E00");
return;
}
TaskState *ts = get_task_state(cpu);
if (!ts || !ts->bprm || !ts->bprm->filename) {
gdb_put_packet("E00");
return;
}
size_t total_length = strlen(ts->bprm->filename);
if (offset > total_length) {
gdb_put_packet("E00");
return;
}
if (offset + length > total_length) {
length = total_length - offset;
}
g_string_printf(gdbserver_state.str_buf, "l%.*s", length,
ts->bprm->filename + offset);
gdb_put_strbuf();
}
int gdb_target_sigtrap(void)
{
return TARGET_SIGTRAP;
}

0
gdbstub/user.c → backup/user.c
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0
gdbstub/user.h → backup/user.h
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164
gdbstub/gdbstub.h Normal file
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@ -0,0 +1,164 @@
#ifndef GDBSTUB_H
#define GDBSTUB_H
typedef struct GDBFeature {
const char *xmlname;
const char *xml;
const char *name;
const char * const *regs;
int num_regs;
} GDBFeature;
typedef struct GDBFeatureBuilder {
GDBFeature *feature;
GPtrArray *xml;
GPtrArray *regs;
int base_reg;
} GDBFeatureBuilder;
/* Get or set a register. Returns the size of the register. */
typedef int (*gdb_get_reg_cb)(CPUState *cpu, GByteArray *buf, int reg);
typedef int (*gdb_set_reg_cb)(CPUState *cpu, uint8_t *buf, int reg);
/**
* gdb_init_cpu(): Initialize the CPU for gdbstub.
* @cpu: The CPU to be initialized.
*/
void gdb_init_cpu(CPUState *cpu);
/**
* gdb_register_coprocessor() - register a supplemental set of registers
* @cpu - the CPU associated with registers
* @get_reg - get function (gdb reading)
* @set_reg - set function (gdb modifying)
* @num_regs - number of registers in set
* @xml - xml name of set
* @gpos - non-zero to append to "general" register set at @gpos
*/
void gdb_register_coprocessor(CPUState *cpu,
gdb_get_reg_cb get_reg, gdb_set_reg_cb set_reg,
const GDBFeature *feature, int g_pos);
/**
* gdb_unregister_coprocessor_all() - unregisters supplemental set of registers
* @cpu - the CPU associated with registers
*/
void gdb_unregister_coprocessor_all(CPUState *cpu);
/**
* gdbserver_start: start the gdb server
* @port_or_device: connection spec for gdb
* @errp: error handle
*
* For CONFIG_USER this is either a tcp port or a path to a fifo. For
* system emulation you can use a full chardev spec for your gdbserver
* port.
*
* The error handle should be either &error_fatal (for start-up) or
* &error_warn (for QMP/HMP initiated sessions).
*
* Returns true when server successfully started.
*/
bool gdbserver_start(const char *port_or_device, Error **errp);
/**
* gdb_feature_builder_init() - Initialize GDBFeatureBuilder.
* @builder: The builder to be initialized.
* @feature: The feature to be filled.
* @name: The name of the feature.
* @xmlname: The name of the XML.
* @base_reg: The base number of the register ID.
*/
void gdb_feature_builder_init(GDBFeatureBuilder *builder, GDBFeature *feature,
const char *name, const char *xmlname,
int base_reg);
/**
* gdb_feature_builder_append_tag() - Append a tag.
* @builder: The builder.
* @format: The format of the tag.
* @...: The values to be formatted.
*/
void G_GNUC_PRINTF(2, 3)
gdb_feature_builder_append_tag(const GDBFeatureBuilder *builder,
const char *format, ...);
/**
* gdb_feature_builder_append_reg() - Append a register.
* @builder: The builder.
* @name: The register's name; it must be unique within a CPU.
* @bitsize: The register's size, in bits.
* @regnum: The offset of the register's number in the feature.
* @type: The type of the register.
* @group: The register group to which this register belongs; it can be NULL.
*/
void gdb_feature_builder_append_reg(const GDBFeatureBuilder *builder,
const char *name,
int bitsize,
int regnum,
const char *type,
const char *group);
/**
* gdb_feature_builder_end() - End building GDBFeature.
* @builder: The builder.
*/
void gdb_feature_builder_end(const GDBFeatureBuilder *builder);
/**
* gdb_find_static_feature() - Find a static feature.
* @xmlname: The name of the XML.
*
* Return: The static feature.
*/
const GDBFeature *gdb_find_static_feature(const char *xmlname);
/**
* gdb_read_register() - Read a register associated with a CPU.
* @cpu: The CPU associated with the register.
* @buf: The buffer that the read register will be appended to.
* @reg: The register's number returned by gdb_find_feature_register().
*
* Return: The number of read bytes.
*/
int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
/**
* gdb_write_register() - Write a register associated with a CPU.
* @cpu: The CPU associated with the register.
* @buf: The buffer that the register contents will be set to.
* @reg: The register's number returned by gdb_find_feature_register().
*
* The size of @buf must be at least the size of the register being
* written.
*
* Return: The number of written bytes, or 0 if an error occurred (for
* example, an unknown register was provided).
*/
int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg);
/**
* typedef GDBRegDesc - a register description from gdbstub
*/
typedef struct {
int gdb_reg;
const char *name;
const char *feature_name;
} GDBRegDesc;
/**
* gdb_get_register_list() - Return list of all registers for CPU
* @cpu: The CPU being searched
*
* Returns a GArray of GDBRegDesc, caller frees array but not the
* const strings.
*/
GArray *gdb_get_register_list(CPUState *cpu);
void gdb_set_stop_cpu(CPUState *cpu);
/* in gdbstub-xml.c, generated by scripts/feature_to_c.py */
extern const GDBFeature gdb_static_features[];
#endif /* GDBSTUB_H */