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gdbstub: move breakpoint logic to accel ops

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As HW virtualization requires specific support to handle breakpoints
lets push out special casing out of the core gdbstub code and into
AccelOpsClass. This will make it easier to add other accelerator
support and reduces some of the stub shenanigans.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Mads Ynddal <mads@ynddal.dk>
Message-Id: <20220929114231.583801-45-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2022-09-29 12:42:24 +01:00
parent 3b7a93880a
commit ae7467b1ac
14 changed files with 259 additions and 160 deletions
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127
gdbstub/gdbstub.c
View file

@ -49,8 +49,11 @@
#include "sysemu/runstate.h"
#include "semihosting/semihost.h"
#include "exec/exec-all.h"
#include "exec/hwaddr.h"
#include "sysemu/replay.h"
#include "internals.h"
#ifdef CONFIG_USER_ONLY
#define GDB_ATTACHED "0"
#else
@ -1012,130 +1015,16 @@ void gdb_register_coprocessor(CPUState *cpu,
}
}
#ifndef CONFIG_USER_ONLY
/* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */
static inline int xlat_gdb_type(CPUState *cpu, int gdbtype)
{
static const int xlat[] = {
[GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE,
[GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ,
[GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
};
CPUClass *cc = CPU_GET_CLASS(cpu);
int cputype = xlat[gdbtype];
if (cc->gdb_stop_before_watchpoint) {
cputype |= BP_STOP_BEFORE_ACCESS;
}
return cputype;
}
#endif
static int gdb_breakpoint_insert(int type, target_ulong addr, target_ulong len)
{
CPUState *cpu;
int err = 0;
if (kvm_enabled()) {
return kvm_insert_breakpoint(gdbserver_state.c_cpu, addr, len, type);
}
switch (type) {
case GDB_BREAKPOINT_SW:
case GDB_BREAKPOINT_HW:
CPU_FOREACH(cpu) {
err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL);
if (err) {
break;
}
}
return err;
#ifndef CONFIG_USER_ONLY
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_ACCESS:
CPU_FOREACH(cpu) {
err = cpu_watchpoint_insert(cpu, addr, len,
xlat_gdb_type(cpu, type), NULL);
if (err) {
break;
}
}
return err;
#endif
default:
return -ENOSYS;
}
}
static int gdb_breakpoint_remove(int type, target_ulong addr, target_ulong len)
{
CPUState *cpu;
int err = 0;
if (kvm_enabled()) {
return kvm_remove_breakpoint(gdbserver_state.c_cpu, addr, len, type);
}
switch (type) {
case GDB_BREAKPOINT_SW:
case GDB_BREAKPOINT_HW:
CPU_FOREACH(cpu) {
err = cpu_breakpoint_remove(cpu, addr, BP_GDB);
if (err) {
break;
}
}
return err;
#ifndef CONFIG_USER_ONLY
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_ACCESS:
CPU_FOREACH(cpu) {
err = cpu_watchpoint_remove(cpu, addr, len,
xlat_gdb_type(cpu, type));
if (err)
break;
}
return err;
#endif
default:
return -ENOSYS;
}
}
static inline void gdb_cpu_breakpoint_remove_all(CPUState *cpu)
{
cpu_breakpoint_remove_all(cpu, BP_GDB);
#ifndef CONFIG_USER_ONLY
cpu_watchpoint_remove_all(cpu, BP_GDB);
#endif
}
static void gdb_process_breakpoint_remove_all(GDBProcess *p)
{
CPUState *cpu = get_first_cpu_in_process(p);
while (cpu) {
gdb_cpu_breakpoint_remove_all(cpu);
gdb_breakpoint_remove_all(cpu);
cpu = gdb_next_cpu_in_process(cpu);
}
}
static void gdb_breakpoint_remove_all(void)
{
CPUState *cpu;
if (kvm_enabled()) {
kvm_remove_all_breakpoints(gdbserver_state.c_cpu);
return;
}
CPU_FOREACH(cpu) {
gdb_cpu_breakpoint_remove_all(cpu);
}
}
static void gdb_set_cpu_pc(target_ulong pc)
{
@ -1667,7 +1556,8 @@ static void handle_insert_bp(GArray *params, void *user_ctx)
return;
}
res = gdb_breakpoint_insert(get_param(params, 0)->val_ul,
res = gdb_breakpoint_insert(gdbserver_state.c_cpu,
get_param(params, 0)->val_ul,
get_param(params, 1)->val_ull,
get_param(params, 2)->val_ull);
if (res >= 0) {
@ -1690,7 +1580,8 @@ static void handle_remove_bp(GArray *params, void *user_ctx)
return;
}
res = gdb_breakpoint_remove(get_param(params, 0)->val_ul,
res = gdb_breakpoint_remove(gdbserver_state.c_cpu,
get_param(params, 0)->val_ul,
get_param(params, 1)->val_ull,
get_param(params, 2)->val_ull);
if (res >= 0) {
@ -2541,7 +2432,7 @@ static void handle_target_halt(GArray *params, void *user_ctx)
* because gdb is doing an initial connect and the state
* should be cleaned up.
*/
gdb_breakpoint_remove_all();
gdb_breakpoint_remove_all(gdbserver_state.c_cpu);
}
static int gdb_handle_packet(const char *line_buf)