qemu/target/arm/gdbstub.c

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/*
* ARM gdb server stub
*
* Copyright (c) 2003-2005 Fabrice Bellard
* Copyright (c) 2013 SUSE LINUX Products GmbH
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/gdbstub.h"
#include "gdbstub/helpers.h"
#include "sysemu/tcg.h"
#include "internals.h"
#include "cpu-features.h"
#include "cpregs.h"
typedef struct RegisterSysregXmlParam {
CPUState *cs;
GString *s;
int n;
} RegisterSysregXmlParam;
/* Old gdb always expect FPA registers. Newer (xml-aware) gdb only expect
whatever the target description contains. Due to a historical mishap
the FPA registers appear in between core integer regs and the CPSR.
We hack round this by giving the FPA regs zero size when talking to a
newer gdb. */
int arm_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
{
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
if (n < 16) {
/* Core integer register. */
return gdb_get_reg32(mem_buf, env->regs[n]);
}
if (n == 25) {
/* CPSR, or XPSR for M-profile */
if (arm_feature(env, ARM_FEATURE_M)) {
return gdb_get_reg32(mem_buf, xpsr_read(env));
} else {
return gdb_get_reg32(mem_buf, cpsr_read(env));
}
}
/* Unknown register. */
return 0;
}
int arm_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
uint32_t tmp;
tmp = ldl_p(mem_buf);
/*
* Mask out low bits of PC to workaround gdb bugs.
* This avoids an assert in thumb_tr_translate_insn, because it is
* architecturally impossible to misalign the pc.
* This will probably cause problems if we ever implement the
* Jazelle DBX extensions.
*/
if (n == 15) {
tmp &= ~1;
}
if (n < 16) {
/* Core integer register. */
if (n == 13 && arm_feature(env, ARM_FEATURE_M)) {
/* M profile SP low bits are always 0 */
tmp &= ~3;
}
env->regs[n] = tmp;
return 4;
}
if (n == 25) {
/* CPSR, or XPSR for M-profile */
if (arm_feature(env, ARM_FEATURE_M)) {
/*
* Don't allow writing to XPSR.Exception as it can cause
* a transition into or out of handler mode (it's not
* writable via the MSR insn so this is a reasonable
* restriction). Other fields are safe to update.
*/
xpsr_write(env, tmp, ~XPSR_EXCP);
} else {
cpsr_write(env, tmp, 0xffffffff, CPSRWriteByGDBStub);
}
return 4;
}
/* Unknown register. */
return 0;
}
static int vfp_gdb_get_reg(CPUARMState *env, GByteArray *buf, int reg)
{
ARMCPU *cpu = env_archcpu(env);
int nregs = cpu_isar_feature(aa32_simd_r32, cpu) ? 32 : 16;
/* VFP data registers are always little-endian. */
if (reg < nregs) {
return gdb_get_reg64(buf, *aa32_vfp_dreg(env, reg));
}
if (arm_feature(env, ARM_FEATURE_NEON)) {
/* Aliases for Q regs. */
nregs += 16;
if (reg < nregs) {
uint64_t *q = aa32_vfp_qreg(env, reg - 32);
return gdb_get_reg128(buf, q[0], q[1]);
}
}
switch (reg - nregs) {
case 0:
return gdb_get_reg32(buf, vfp_get_fpscr(env));
}
return 0;
}
static int vfp_gdb_set_reg(CPUARMState *env, uint8_t *buf, int reg)
{
ARMCPU *cpu = env_archcpu(env);
int nregs = cpu_isar_feature(aa32_simd_r32, cpu) ? 32 : 16;
if (reg < nregs) {
*aa32_vfp_dreg(env, reg) = ldq_le_p(buf);
return 8;
}
if (arm_feature(env, ARM_FEATURE_NEON)) {
nregs += 16;
if (reg < nregs) {
uint64_t *q = aa32_vfp_qreg(env, reg - 32);
q[0] = ldq_le_p(buf);
q[1] = ldq_le_p(buf + 8);
return 16;
}
}
switch (reg - nregs) {
case 0:
vfp_set_fpscr(env, ldl_p(buf));
return 4;
}
return 0;
}
static int vfp_gdb_get_sysreg(CPUARMState *env, GByteArray *buf, int reg)
{
switch (reg) {
case 0:
return gdb_get_reg32(buf, env->vfp.xregs[ARM_VFP_FPSID]);
case 1:
return gdb_get_reg32(buf, env->vfp.xregs[ARM_VFP_FPEXC]);
}
return 0;
}
static int vfp_gdb_set_sysreg(CPUARMState *env, uint8_t *buf, int reg)
{
switch (reg) {
case 0:
env->vfp.xregs[ARM_VFP_FPSID] = ldl_p(buf);
return 4;
case 1:
env->vfp.xregs[ARM_VFP_FPEXC] = ldl_p(buf) & (1 << 30);
return 4;
}
return 0;
}
static int mve_gdb_get_reg(CPUARMState *env, GByteArray *buf, int reg)
{
switch (reg) {
case 0:
return gdb_get_reg32(buf, env->v7m.vpr);
default:
return 0;
}
}
static int mve_gdb_set_reg(CPUARMState *env, uint8_t *buf, int reg)
{
switch (reg) {
case 0:
env->v7m.vpr = ldl_p(buf);
return 4;
default:
return 0;
}
}
/**
* arm_get/set_gdb_*: get/set a gdb register
* @env: the CPU state
* @buf: a buffer to copy to/from
* @reg: register number (offset from start of group)
*
* We return the number of bytes copied
*/
static int arm_gdb_get_sysreg(CPUARMState *env, GByteArray *buf, int reg)
{
ARMCPU *cpu = env_archcpu(env);
const ARMCPRegInfo *ri;
uint32_t key;
key = cpu->dyn_sysreg_xml.data.cpregs.keys[reg];
ri = get_arm_cp_reginfo(cpu->cp_regs, key);
if (ri) {
if (cpreg_field_is_64bit(ri)) {
return gdb_get_reg64(buf, (uint64_t)read_raw_cp_reg(env, ri));
} else {
return gdb_get_reg32(buf, (uint32_t)read_raw_cp_reg(env, ri));
}
}
return 0;
}
static int arm_gdb_set_sysreg(CPUARMState *env, uint8_t *buf, int reg)
{
return 0;
}
static void arm_gen_one_xml_sysreg_tag(GString *s, DynamicGDBXMLInfo *dyn_xml,
ARMCPRegInfo *ri, uint32_t ri_key,
int bitsize, int regnum)
{
g_string_append_printf(s, "<reg name=\"%s\"", ri->name);
g_string_append_printf(s, " bitsize=\"%d\"", bitsize);
g_string_append_printf(s, " regnum=\"%d\"", regnum);
g_string_append_printf(s, " group=\"cp_regs\"/>");
dyn_xml->data.cpregs.keys[dyn_xml->num] = ri_key;
dyn_xml->num++;
}
static void arm_register_sysreg_for_xml(gpointer key, gpointer value,
gpointer p)
{
uint32_t ri_key = (uintptr_t)key;
ARMCPRegInfo *ri = value;
RegisterSysregXmlParam *param = (RegisterSysregXmlParam *)p;
GString *s = param->s;
ARMCPU *cpu = ARM_CPU(param->cs);
CPUARMState *env = &cpu->env;
DynamicGDBXMLInfo *dyn_xml = &cpu->dyn_sysreg_xml;
if (!(ri->type & (ARM_CP_NO_RAW | ARM_CP_NO_GDB))) {
if (arm_feature(env, ARM_FEATURE_AARCH64)) {
if (ri->state == ARM_CP_STATE_AA64) {
arm_gen_one_xml_sysreg_tag(s , dyn_xml, ri, ri_key, 64,
param->n++);
}
} else {
if (ri->state == ARM_CP_STATE_AA32) {
if (!arm_feature(env, ARM_FEATURE_EL3) &&
(ri->secure & ARM_CP_SECSTATE_S)) {
return;
}
if (ri->type & ARM_CP_64BIT) {
arm_gen_one_xml_sysreg_tag(s , dyn_xml, ri, ri_key, 64,
param->n++);
} else {
arm_gen_one_xml_sysreg_tag(s , dyn_xml, ri, ri_key, 32,
param->n++);
}
}
}
}
}
static int arm_gen_dynamic_sysreg_xml(CPUState *cs, int base_reg)
{
ARMCPU *cpu = ARM_CPU(cs);
GString *s = g_string_new(NULL);
RegisterSysregXmlParam param = {cs, s, base_reg};
cpu->dyn_sysreg_xml.num = 0;
cpu->dyn_sysreg_xml.data.cpregs.keys = g_new(uint32_t, g_hash_table_size(cpu->cp_regs));
g_string_printf(s, "<?xml version=\"1.0\"?>");
g_string_append_printf(s, "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">");
g_string_append_printf(s, "<feature name=\"org.qemu.gdb.arm.sys.regs\">");
g_hash_table_foreach(cpu->cp_regs, arm_register_sysreg_for_xml, &param);
g_string_append_printf(s, "</feature>");
cpu->dyn_sysreg_xml.desc = g_string_free(s, false);
return cpu->dyn_sysreg_xml.num;
}
#ifdef CONFIG_TCG
typedef enum {
M_SYSREG_MSP,
M_SYSREG_PSP,
M_SYSREG_PRIMASK,
M_SYSREG_CONTROL,
M_SYSREG_BASEPRI,
M_SYSREG_FAULTMASK,
M_SYSREG_MSPLIM,
M_SYSREG_PSPLIM,
} MProfileSysreg;
static const struct {
const char *name;
int feature;
} m_sysreg_def[] = {
[M_SYSREG_MSP] = { "msp", ARM_FEATURE_M },
[M_SYSREG_PSP] = { "psp", ARM_FEATURE_M },
[M_SYSREG_PRIMASK] = { "primask", ARM_FEATURE_M },
[M_SYSREG_CONTROL] = { "control", ARM_FEATURE_M },
[M_SYSREG_BASEPRI] = { "basepri", ARM_FEATURE_M_MAIN },
[M_SYSREG_FAULTMASK] = { "faultmask", ARM_FEATURE_M_MAIN },
[M_SYSREG_MSPLIM] = { "msplim", ARM_FEATURE_V8 },
[M_SYSREG_PSPLIM] = { "psplim", ARM_FEATURE_V8 },
};
static uint32_t *m_sysreg_ptr(CPUARMState *env, MProfileSysreg reg, bool sec)
{
uint32_t *ptr;
switch (reg) {
case M_SYSREG_MSP:
ptr = arm_v7m_get_sp_ptr(env, sec, false, true);
break;
case M_SYSREG_PSP:
ptr = arm_v7m_get_sp_ptr(env, sec, true, true);
break;
case M_SYSREG_MSPLIM:
ptr = &env->v7m.msplim[sec];
break;
case M_SYSREG_PSPLIM:
ptr = &env->v7m.psplim[sec];
break;
case M_SYSREG_PRIMASK:
ptr = &env->v7m.primask[sec];
break;
case M_SYSREG_BASEPRI:
ptr = &env->v7m.basepri[sec];
break;
case M_SYSREG_FAULTMASK:
ptr = &env->v7m.faultmask[sec];
break;
case M_SYSREG_CONTROL:
ptr = &env->v7m.control[sec];
break;
default:
return NULL;
}
return arm_feature(env, m_sysreg_def[reg].feature) ? ptr : NULL;
}
static int m_sysreg_get(CPUARMState *env, GByteArray *buf,
MProfileSysreg reg, bool secure)
{
uint32_t *ptr = m_sysreg_ptr(env, reg, secure);
if (ptr == NULL) {
return 0;
}
return gdb_get_reg32(buf, *ptr);
}
static int arm_gdb_get_m_systemreg(CPUARMState *env, GByteArray *buf, int reg)
{
/*
* Here, we emulate MRS instruction, where CONTROL has a mix of
* banked and non-banked bits.
*/
if (reg == M_SYSREG_CONTROL) {
return gdb_get_reg32(buf, arm_v7m_mrs_control(env, env->v7m.secure));
}
return m_sysreg_get(env, buf, reg, env->v7m.secure);
}
static int arm_gdb_set_m_systemreg(CPUARMState *env, uint8_t *buf, int reg)
{
return 0; /* TODO */
}
static int arm_gen_dynamic_m_systemreg_xml(CPUState *cs, int orig_base_reg)
{
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
GString *s = g_string_new(NULL);
int base_reg = orig_base_reg;
int i;
g_string_printf(s, "<?xml version=\"1.0\"?>");
g_string_append_printf(s, "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">");
g_string_append_printf(s, "<feature name=\"org.gnu.gdb.arm.m-system\">\n");
for (i = 0; i < ARRAY_SIZE(m_sysreg_def); i++) {
if (arm_feature(env, m_sysreg_def[i].feature)) {
g_string_append_printf(s,
"<reg name=\"%s\" bitsize=\"32\" regnum=\"%d\"/>\n",
m_sysreg_def[i].name, base_reg++);
}
}
g_string_append_printf(s, "</feature>");
cpu->dyn_m_systemreg_xml.desc = g_string_free(s, false);
cpu->dyn_m_systemreg_xml.num = base_reg - orig_base_reg;
return cpu->dyn_m_systemreg_xml.num;
}
#ifndef CONFIG_USER_ONLY
/*
* For user-only, we see the non-secure registers via m_systemreg above.
* For secext, encode the non-secure view as even and secure view as odd.
*/
static int arm_gdb_get_m_secextreg(CPUARMState *env, GByteArray *buf, int reg)
{
return m_sysreg_get(env, buf, reg >> 1, reg & 1);
}
static int arm_gdb_set_m_secextreg(CPUARMState *env, uint8_t *buf, int reg)
{
return 0; /* TODO */
}
static int arm_gen_dynamic_m_secextreg_xml(CPUState *cs, int orig_base_reg)
{
ARMCPU *cpu = ARM_CPU(cs);
GString *s = g_string_new(NULL);
int base_reg = orig_base_reg;
int i;
g_string_printf(s, "<?xml version=\"1.0\"?>");
g_string_append_printf(s, "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">");
g_string_append_printf(s, "<feature name=\"org.gnu.gdb.arm.secext\">\n");
for (i = 0; i < ARRAY_SIZE(m_sysreg_def); i++) {
g_string_append_printf(s,
"<reg name=\"%s_ns\" bitsize=\"32\" regnum=\"%d\"/>\n",
m_sysreg_def[i].name, base_reg++);
g_string_append_printf(s,
"<reg name=\"%s_s\" bitsize=\"32\" regnum=\"%d\"/>\n",
m_sysreg_def[i].name, base_reg++);
}
g_string_append_printf(s, "</feature>");
cpu->dyn_m_secextreg_xml.desc = g_string_free(s, false);
cpu->dyn_m_secextreg_xml.num = base_reg - orig_base_reg;
return cpu->dyn_m_secextreg_xml.num;
}
#endif
#endif /* CONFIG_TCG */
const char *arm_gdb_get_dynamic_xml(CPUState *cs, const char *xmlname)
{
ARMCPU *cpu = ARM_CPU(cs);
if (strcmp(xmlname, "system-registers.xml") == 0) {
return cpu->dyn_sysreg_xml.desc;
} else if (strcmp(xmlname, "sve-registers.xml") == 0) {
return cpu->dyn_svereg_xml.desc;
} else if (strcmp(xmlname, "arm-m-system.xml") == 0) {
return cpu->dyn_m_systemreg_xml.desc;
#ifndef CONFIG_USER_ONLY
} else if (strcmp(xmlname, "arm-m-secext.xml") == 0) {
return cpu->dyn_m_secextreg_xml.desc;
#endif
}
return NULL;
}
void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu)
{
CPUState *cs = CPU(cpu);
CPUARMState *env = &cpu->env;
if (arm_feature(env, ARM_FEATURE_AARCH64)) {
/*
* The lower part of each SVE register aliases to the FPU
* registers so we don't need to include both.
*/
#ifdef TARGET_AARCH64
if (isar_feature_aa64_sve(&cpu->isar)) {
int nreg = arm_gen_dynamic_svereg_xml(cs, cs->gdb_num_regs);
gdb_register_coprocessor(cs, aarch64_gdb_get_sve_reg,
aarch64_gdb_set_sve_reg, nreg,
"sve-registers.xml", 0);
} else {
gdb_register_coprocessor(cs, aarch64_gdb_get_fpu_reg,
aarch64_gdb_set_fpu_reg,
34, "aarch64-fpu.xml", 0);
}
/*
* Note that we report pauth information via the feature name
* org.gnu.gdb.aarch64.pauth_v2, not org.gnu.gdb.aarch64.pauth.
* GDB versions 9 through 12 have a bug where they will crash
* if they see the latter XML from QEMU.
*/
if (isar_feature_aa64_pauth(&cpu->isar)) {
gdb_register_coprocessor(cs, aarch64_gdb_get_pauth_reg,
aarch64_gdb_set_pauth_reg,
4, "aarch64-pauth.xml", 0);
}
#endif
} else {
if (arm_feature(env, ARM_FEATURE_NEON)) {
gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg,
49, "arm-neon.xml", 0);
} else if (cpu_isar_feature(aa32_simd_r32, cpu)) {
gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg,
33, "arm-vfp3.xml", 0);
} else if (cpu_isar_feature(aa32_vfp_simd, cpu)) {
gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg,
17, "arm-vfp.xml", 0);
}
if (!arm_feature(env, ARM_FEATURE_M)) {
/*
* A and R profile have FP sysregs FPEXC and FPSID that we
* expose to gdb.
*/
gdb_register_coprocessor(cs, vfp_gdb_get_sysreg, vfp_gdb_set_sysreg,
2, "arm-vfp-sysregs.xml", 0);
}
}
if (cpu_isar_feature(aa32_mve, cpu) && tcg_enabled()) {
gdb_register_coprocessor(cs, mve_gdb_get_reg, mve_gdb_set_reg,
1, "arm-m-profile-mve.xml", 0);
}
gdb_register_coprocessor(cs, arm_gdb_get_sysreg, arm_gdb_set_sysreg,
arm_gen_dynamic_sysreg_xml(cs, cs->gdb_num_regs),
"system-registers.xml", 0);
#ifdef CONFIG_TCG
if (arm_feature(env, ARM_FEATURE_M) && tcg_enabled()) {
gdb_register_coprocessor(cs,
arm_gdb_get_m_systemreg, arm_gdb_set_m_systemreg,
arm_gen_dynamic_m_systemreg_xml(cs, cs->gdb_num_regs),
"arm-m-system.xml", 0);
#ifndef CONFIG_USER_ONLY
if (arm_feature(env, ARM_FEATURE_M_SECURITY)) {
gdb_register_coprocessor(cs,
arm_gdb_get_m_secextreg, arm_gdb_set_m_secextreg,
arm_gen_dynamic_m_secextreg_xml(cs, cs->gdb_num_regs),
"arm-m-secext.xml", 0);
}
#endif
}
#endif /* CONFIG_TCG */
}