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gdbstub: Fix gdb_register_coprocessor() register counting 

Commit a0e372f0c4 reorganized the register
counting for GDB. While it seems correct not to let the total number of
registers skyrocket in an SMP scenario through a static variable, the
distinction between total register count and 'g' packet register count
(last_reg vs. num_g_regs) got lost among the way.

Fix this by introducing CPUState::gdb_num_g_regs and using that in
gdb_handle_packet().

Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: qemu-stable@nongnu.org (stable-1.6)
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Tested-by: Max Filippov <jcmvbkbc@gmail.com>
Tested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Andreas Färber 2013-08-12 18:09:47 +02:00
parent f202039811
commit 35143f0164
3 changed files with 7 additions and 3 deletions
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6
gdbstub.c
View File

@ -621,6 +621,8 @@ void gdb_register_coprocessor(CPUState *cpu,
if (g_pos != s->base_reg) {
fprintf(stderr, "Error: Bad gdb register numbering for '%s'\n"
"Expected %d got %d\n", xml, g_pos, s->base_reg);
} else {
cpu->gdb_num_g_regs = cpu->gdb_num_regs;
}
}
}
@ -902,7 +904,7 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
case 'g':
cpu_synchronize_state(s->g_cpu);
len = 0;
for (addr = 0; addr < s->g_cpu->gdb_num_regs; addr++) {
for (addr = 0; addr < s->g_cpu->gdb_num_g_regs; addr++) {
reg_size = gdb_read_register(s->g_cpu, mem_buf + len, addr);
len += reg_size;
}
@ -914,7 +916,7 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
registers = mem_buf;
len = strlen(p) / 2;
hextomem((uint8_t *)registers, p, len);
for (addr = 0; addr < s->g_cpu->gdb_num_regs && len > 0; addr++) {
for (addr = 0; addr < s->g_cpu->gdb_num_g_regs && len > 0; addr++) {
reg_size = gdb_write_register(s->g_cpu, registers, addr);
len -= reg_size;
registers += reg_size;

2
include/qom/cpu.h
View File

@ -152,6 +152,7 @@ struct kvm_run;
* @current_tb: Currently executing TB.
* @gdb_regs: Additional GDB registers.
* @gdb_num_regs: Number of total registers accessible to GDB.
* @gdb_num_g_regs: Number of registers in GDB 'g' packets.
* @next_cpu: Next CPU sharing TB cache.
* @kvm_fd: vCPU file descriptor for KVM.
*
@ -188,6 +189,7 @@ struct CPUState {
struct TranslationBlock *current_tb;
struct GDBRegisterState *gdb_regs;
int gdb_num_regs;
int gdb_num_g_regs;
CPUState *next_cpu;
int kvm_fd;

2
qom/cpu.c
View File

@ -240,7 +240,7 @@ static void cpu_common_initfn(Object *obj)
CPUState *cpu = CPU(obj);
CPUClass *cc = CPU_GET_CLASS(obj);
cpu->gdb_num_regs = cc->gdb_num_core_regs;
cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
}
static int64_t cpu_common_get_arch_id(CPUState *cpu)