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target/arm: Add the XML dynamic generation

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Generate an XML description for the cp-regs.
Register these regs with the gdb_register_coprocessor().
Add arm_gdb_get_sysreg() to use it as a callback to read those regs.
Add a dummy arm_gdb_set_sysreg().

Signed-off-by: Abdallah Bouassida <abdallah.bouassida@lauterbach.com>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1524153386-3550-4-git-send-email-abdallah.bouassida@lauterbach.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Abdallah Bouassida 2018-05-18 17:48:07 +01:00 • committed by Peter Maydell
parent 9c513e786d
commit 200bf5b7ff
6 changed files with 143 additions and 1 deletions
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76
target/arm/gdbstub.c
View file

@ -22,6 +22,11 @@
#include "cpu.h"
#include "exec/gdbstub.h"
typedef struct RegisterSysregXmlParam {
CPUState *cs;
GString *s;
} 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.
@ -101,3 +106,74 @@ int arm_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
/* Unknown register. */
return 0;
}
static void arm_gen_one_xml_reg_tag(GString *s, DynamicGDBXMLInfo *dyn_xml,
ARMCPRegInfo *ri, uint32_t ri_key,
int bitsize)
{
g_string_append_printf(s, "<reg name=\"%s\"", ri->name);
g_string_append_printf(s, " bitsize=\"%d\"", bitsize);
g_string_append_printf(s, " group=\"cp_regs\"/>");
dyn_xml->num_cpregs++;
dyn_xml->cpregs_keys[dyn_xml->num_cpregs - 1] = ri_key;
}
static void arm_register_sysreg_for_xml(gpointer key, gpointer value,
gpointer p)
{
uint32_t ri_key = *(uint32_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_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_reg_tag(s , dyn_xml, ri, ri_key, 64);
}
} 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_reg_tag(s , dyn_xml, ri, ri_key, 64);
} else {
arm_gen_one_xml_reg_tag(s , dyn_xml, ri, ri_key, 32);
}
}
}
}
}
int arm_gen_dynamic_xml(CPUState *cs)
{
ARMCPU *cpu = ARM_CPU(cs);
GString *s = g_string_new(NULL);
RegisterSysregXmlParam param = {cs, s};
cpu->dyn_xml.num_cpregs = 0;
cpu->dyn_xml.cpregs_keys = g_malloc(sizeof(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_xml.desc = g_string_free(s, false);
return cpu->dyn_xml.num_cpregs;
}
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_xml.desc;
}
return NULL;
}