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target/loongarch: Add gdb support.

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Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-42-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Xiaojuan Yang 10 months ago committed by Richard Henderson
parent 9e6602d657
commit ca61e75071
8 changed files with 198 additions and 0 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 1
      MAINTAINERS
  2. 1
      configs/targets/loongarch64-softmmu.mak
  3. 44
      gdb-xml/loongarch-base64.xml
  4. 57
      gdb-xml/loongarch-fpu64.xml
  5. 9
      target/loongarch/cpu.c
  6. 81
      target/loongarch/gdbstub.c
  7. 4
      target/loongarch/internals.h
  8. 1
      target/loongarch/meson.build

1
MAINTAINERS
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@ -1137,6 +1137,7 @@ F: include/hw/intc/loongarch_*.h
F: hw/intc/loongarch_*.c
F: include/hw/pci-host/ls7a.h
F: hw/rtc/ls7a_rtc.c
F: gdb-xml/loongarch*.xml
M68K Machines
-------------

1
configs/targets/loongarch64-softmmu.mak
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@ -1,3 +1,4 @@
TARGET_ARCH=loongarch64
TARGET_BASE_ARCH=loongarch
TARGET_SUPPORTS_MTTCG=y
TARGET_XML_FILES= gdb-xml/loongarch-base64.xml gdb-xml/loongarch-fpu64.xml

44
gdb-xml/loongarch-base64.xml
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@ -0,0 +1,44 @@
<?xml version="1.0"?>
<!-- Copyright (C) 2021 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. -->
<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.loongarch.base">
<reg name="r0" bitsize="64" type="uint64" group="general"/>
<reg name="r1" bitsize="64" type="uint64" group="general"/>
<reg name="r2" bitsize="64" type="uint64" group="general"/>
<reg name="r3" bitsize="64" type="uint64" group="general"/>
<reg name="r4" bitsize="64" type="uint64" group="general"/>
<reg name="r5" bitsize="64" type="uint64" group="general"/>
<reg name="r6" bitsize="64" type="uint64" group="general"/>
<reg name="r7" bitsize="64" type="uint64" group="general"/>
<reg name="r8" bitsize="64" type="uint64" group="general"/>
<reg name="r9" bitsize="64" type="uint64" group="general"/>
<reg name="r10" bitsize="64" type="uint64" group="general"/>
<reg name="r11" bitsize="64" type="uint64" group="general"/>
<reg name="r12" bitsize="64" type="uint64" group="general"/>
<reg name="r13" bitsize="64" type="uint64" group="general"/>
<reg name="r14" bitsize="64" type="uint64" group="general"/>
<reg name="r15" bitsize="64" type="uint64" group="general"/>
<reg name="r16" bitsize="64" type="uint64" group="general"/>
<reg name="r17" bitsize="64" type="uint64" group="general"/>
<reg name="r18" bitsize="64" type="uint64" group="general"/>
<reg name="r19" bitsize="64" type="uint64" group="general"/>
<reg name="r20" bitsize="64" type="uint64" group="general"/>
<reg name="r21" bitsize="64" type="uint64" group="general"/>
<reg name="r22" bitsize="64" type="uint64" group="general"/>
<reg name="r23" bitsize="64" type="uint64" group="general"/>
<reg name="r24" bitsize="64" type="uint64" group="general"/>
<reg name="r25" bitsize="64" type="uint64" group="general"/>
<reg name="r26" bitsize="64" type="uint64" group="general"/>
<reg name="r27" bitsize="64" type="uint64" group="general"/>
<reg name="r28" bitsize="64" type="uint64" group="general"/>
<reg name="r29" bitsize="64" type="uint64" group="general"/>
<reg name="r30" bitsize="64" type="uint64" group="general"/>
<reg name="r31" bitsize="64" type="uint64" group="general"/>
<reg name="pc" bitsize="64" type="code_ptr" group="general"/>
<reg name="badvaddr" bitsize="64" type="code_ptr" group="general"/>
</feature>

57
gdb-xml/loongarch-fpu64.xml
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@ -0,0 +1,57 @@
<?xml version="1.0"?>
<!-- Copyright (C) 2021 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. -->
<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.loongarch.fpu">
<union id="fpu64type">
<field name="f" type="ieee_single"/>
<field name="d" type="ieee_double"/>
</union>
<reg name="f0" bitsize="64" type="fpu64type" group="float"/>
<reg name="f1" bitsize="64" type="fpu64type" group="float"/>
<reg name="f2" bitsize="64" type="fpu64type" group="float"/>
<reg name="f3" bitsize="64" type="fpu64type" group="float"/>
<reg name="f4" bitsize="64" type="fpu64type" group="float"/>
<reg name="f5" bitsize="64" type="fpu64type" group="float"/>
<reg name="f6" bitsize="64" type="fpu64type" group="float"/>
<reg name="f7" bitsize="64" type="fpu64type" group="float"/>
<reg name="f8" bitsize="64" type="fpu64type" group="float"/>
<reg name="f9" bitsize="64" type="fpu64type" group="float"/>
<reg name="f10" bitsize="64" type="fpu64type" group="float"/>
<reg name="f11" bitsize="64" type="fpu64type" group="float"/>
<reg name="f12" bitsize="64" type="fpu64type" group="float"/>
<reg name="f13" bitsize="64" type="fpu64type" group="float"/>
<reg name="f14" bitsize="64" type="fpu64type" group="float"/>
<reg name="f15" bitsize="64" type="fpu64type" group="float"/>
<reg name="f16" bitsize="64" type="fpu64type" group="float"/>
<reg name="f17" bitsize="64" type="fpu64type" group="float"/>
<reg name="f18" bitsize="64" type="fpu64type" group="float"/>
<reg name="f19" bitsize="64" type="fpu64type" group="float"/>
<reg name="f20" bitsize="64" type="fpu64type" group="float"/>
<reg name="f21" bitsize="64" type="fpu64type" group="float"/>
<reg name="f22" bitsize="64" type="fpu64type" group="float"/>
<reg name="f23" bitsize="64" type="fpu64type" group="float"/>
<reg name="f24" bitsize="64" type="fpu64type" group="float"/>
<reg name="f25" bitsize="64" type="fpu64type" group="float"/>
<reg name="f26" bitsize="64" type="fpu64type" group="float"/>
<reg name="f27" bitsize="64" type="fpu64type" group="float"/>
<reg name="f28" bitsize="64" type="fpu64type" group="float"/>
<reg name="f29" bitsize="64" type="fpu64type" group="float"/>
<reg name="f30" bitsize="64" type="fpu64type" group="float"/>
<reg name="f31" bitsize="64" type="fpu64type" group="float"/>
<reg name="fcc0" bitsize="8" type="uint8" group="float"/>
<reg name="fcc1" bitsize="8" type="uint8" group="float"/>
<reg name="fcc2" bitsize="8" type="uint8" group="float"/>
<reg name="fcc3" bitsize="8" type="uint8" group="float"/>
<reg name="fcc4" bitsize="8" type="uint8" group="float"/>
<reg name="fcc5" bitsize="8" type="uint8" group="float"/>
<reg name="fcc6" bitsize="8" type="uint8" group="float"/>
<reg name="fcc7" bitsize="8" type="uint8" group="float"/>
<reg name="fcsr" bitsize="32" type="uint32" group="float"/>
</feature>

9
target/loongarch/cpu.c
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@ -487,6 +487,8 @@ static void loongarch_cpu_realizefn(DeviceState *dev, Error **errp)
return;
}
loongarch_cpu_register_gdb_regs_for_features(cs);
cpu_reset(cs);
qemu_init_vcpu(cs);
@ -640,6 +642,13 @@ static void loongarch_cpu_class_init(ObjectClass *c, void *data)
dc->vmsd = &vmstate_loongarch_cpu;
cc->sysemu_ops = &loongarch_sysemu_ops;
cc->disas_set_info = loongarch_cpu_disas_set_info;
cc->gdb_read_register = loongarch_cpu_gdb_read_register;
cc->gdb_write_register = loongarch_cpu_gdb_write_register;
cc->disas_set_info = loongarch_cpu_disas_set_info;
cc->gdb_num_core_regs = 34;
cc->gdb_core_xml_file = "loongarch-base64.xml";
cc->gdb_stop_before_watchpoint = true;
#ifdef CONFIG_TCG
cc->tcg_ops = &loongarch_tcg_ops;
#endif

81
target/loongarch/gdbstub.c
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@ -0,0 +1,81 @@
/*
* LOONGARCH gdb server stub
*
* Copyright (c) 2021 Loongson Technology Corporation Limited
*
* SPDX-License-Identifier: LGPL-2.1+
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "internals.h"
#include "exec/gdbstub.h"
int loongarch_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
{
LoongArchCPU *cpu = LOONGARCH_CPU(cs);
CPULoongArchState *env = &cpu->env;
if (0 <= n && n < 32) {
return gdb_get_regl(mem_buf, env->gpr[n]);
} else if (n == 32) {
return gdb_get_regl(mem_buf, env->pc);
} else if (n == 33) {
return gdb_get_regl(mem_buf, env->badaddr);
}
return 0;
}
int loongarch_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
LoongArchCPU *cpu = LOONGARCH_CPU(cs);
CPULoongArchState *env = &cpu->env;
target_ulong tmp = ldtul_p(mem_buf);
int length = 0;
if (0 <= n && n < 32) {
env->gpr[n] = tmp;
length = sizeof(target_ulong);
} else if (n == 32) {
env->pc = tmp;
length = sizeof(target_ulong);
}
return length;
}
static int loongarch_gdb_get_fpu(CPULoongArchState *env,
GByteArray *mem_buf, int n)
{
if (0 <= n && n < 32) {
return gdb_get_reg64(mem_buf, env->fpr[n]);
} else if (32 <= n && n < 40) {
return gdb_get_reg8(mem_buf, env->cf[n - 32]);
} else if (n == 40) {
return gdb_get_reg32(mem_buf, env->fcsr0);
}
return 0;
}
static int loongarch_gdb_set_fpu(CPULoongArchState *env,
uint8_t *mem_buf, int n)
{
int length = 0;
if (0 <= n && n < 32) {
env->fpr[n] = ldq_p(mem_buf);
length = 8;
} else if (32 <= n && n < 40) {
env->cf[n - 32] = ldub_p(mem_buf);
length = 1;
} else if (n == 40) {
env->fcsr0 = ldl_p(mem_buf);
length = 4;
}
return length;
}
void loongarch_cpu_register_gdb_regs_for_features(CPUState *cs)
{
gdb_register_coprocessor(cs, loongarch_gdb_get_fpu, loongarch_gdb_set_fpu,
41, "loongarch-fpu64.xml", 0);
}

4
target/loongarch/internals.h
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@ -49,4 +49,8 @@ bool loongarch_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
hwaddr loongarch_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
int loongarch_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n);
int loongarch_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n);
void loongarch_cpu_register_gdb_regs_for_features(CPUState *cs);
#endif

1
target/loongarch/meson.build
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@ -11,6 +11,7 @@ loongarch_tcg_ss.add(files(
'fpu_helper.c',
'op_helper.c',
'translate.c',
'gdbstub.c',
))
loongarch_tcg_ss.add(zlib)

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