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Differential D41684 Diff 126903 devel/gdb/files/kgdb/aarch64-fbsd-kern.c

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devel/gdb/files/kgdb/aarch64-fbsd-kern.c

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#include "regcache.h" #include "regcache.h"
#include "regset.h" #include "regset.h"
#include "solib.h" #include "solib.h"
#include "target.h" #include "target.h"
#include "trad-frame.h" #include "trad-frame.h"
#include "kgdb.h" #include "kgdb.h"
struct aarch64fbsd_info
{
int osreldate;
};
/* Per-program-space data key. */
static const registry<program_space>::key<aarch64fbsd_info> aarch64fbsd_pspace_data;
static void
aarch64fbsd_pspace_data_cleanup (struct program_space *pspace, void *arg)
{
struct aarch64fbsd_info *info = (struct aarch64fbsd_info *)arg;
xfree (info);
}
/* Get the current aarch64_fbsd data. If none is found yet, add it
now. This function always returns a valid object. */
static struct aarch64fbsd_info *
get_aarch64fbsd_info (void)
{
struct aarch64fbsd_info *info;
info = aarch64fbsd_pspace_data.get (current_program_space);
if (info != nullptr)
return info;
info = aarch64fbsd_pspace_data.emplace (current_program_space);
info->osreldate = parse_and_eval_long ("osreldate");
return info;
}
static const struct regcache_map_entry aarch64_fbsd_pcbmap[] = static const struct regcache_map_entry aarch64_fbsd_pcbmap[] =
{ {
{ 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */ { 11, AARCH64_X0_REGNUM + 19, 8 }, /* x19 ... x29 */
{ 1, AARCH64_PC_REGNUM, 8 }, { 1, AARCH64_PC_REGNUM, 8 },
{ 1, REGCACHE_MAP_SKIP, 8 },
{ 1, AARCH64_SP_REGNUM, 8 }, { 1, AARCH64_SP_REGNUM, 8 },
{ 0 } { 0 }
}; };
static const struct regset aarch64_fbsd_pcbregset = static const struct regset aarch64_fbsd_pcbregset =
{ {
aarch64_fbsd_pcbmap, aarch64_fbsd_pcbmap,
regcache_supply_regset, regcache_collect_regset regcache_supply_regset, regcache_collect_regset
}; };
/* In kernels prior to __FreeBSD_version 1400084, struct pcb used an
alternate layout. */
static const struct regcache_map_entry aarch64_fbsd13_pcbmap[] =
{
{ 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */
{ 1, AARCH64_PC_REGNUM, 8 },
{ 1, REGCACHE_MAP_SKIP, 8 },
{ 1, AARCH64_SP_REGNUM, 8 },
{ 0 }
};
static const struct regset aarch64_fbsd13_pcbregset =
{
aarch64_fbsd13_pcbmap,
regcache_supply_regset, regcache_collect_regset
};
static void static void
aarch64_fbsd_supply_pcb(struct regcache *regcache, CORE_ADDR pcb_addr) aarch64_fbsd_supply_pcb(struct regcache *regcache, CORE_ADDR pcb_addr)
{ {
const struct regset *pcbregset;
struct aarch64fbsd_info *info = get_aarch64fbsd_info();
gdb_byte buf[8 * 33]; gdb_byte buf[8 * 33];
if (info->osreldate >= 1400084)
pcbregset = &aarch64_fbsd_pcbregset;
else
pcbregset = &aarch64_fbsd13_pcbregset;
if (target_read_memory (pcb_addr, buf, sizeof buf) == 0) if (target_read_memory (pcb_addr, buf, sizeof buf) == 0)
regcache_supply_regset (&aarch64_fbsd_pcbregset, regcache, -1, buf, regcache_supply_regset (pcbregset, regcache, -1, buf,
sizeof (buf)); sizeof (buf));
} }
static const struct regcache_map_entry aarch64_fbsd_trapframe_map[] =
{
{ 1, AARCH64_SP_REGNUM, 0 },
{ 1, AARCH64_LR_REGNUM, 0 },
{ 1, AARCH64_PC_REGNUM, 0 },
{ 1, AARCH64_CPSR_REGNUM, 0 },
{ 1, REGCACHE_MAP_SKIP, 8 }, /* esr */
{ 1, REGCACHE_MAP_SKIP, 8 }, /* far */
{ 30, AARCH64_X0_REGNUM, 0 }, /* x0 ... x29 */
{ 0 },
};
/* In kernels prior to __FreeBSD_version 1400084, struct trapframe
used an alternate layout. */
static const struct regcache_map_entry aarch64_fbsd13_trapframe_map[] =
{
{ 1, AARCH64_SP_REGNUM, 0 },
{ 1, AARCH64_LR_REGNUM, 0 },
{ 1, AARCH64_PC_REGNUM, 0 },
{ 1, AARCH64_CPSR_REGNUM, 4 },
{ 1, REGCACHE_MAP_SKIP, 4 }, /* esr */
{ 30, AARCH64_X0_REGNUM, 0 }, /* x0 ... x29 */
{ 0 },
};
static struct trad_frame_cache * static struct trad_frame_cache *
aarch64_fbsd_trapframe_cache (frame_info_ptr this_frame, void **this_cache) aarch64_fbsd_trapframe_cache (frame_info_ptr this_frame, void **this_cache)
{ {
struct gdbarch *gdbarch = get_frame_arch (this_frame); struct gdbarch *gdbarch = get_frame_arch (this_frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
struct aarch64fbsd_info *info = get_aarch64fbsd_info();
struct trad_frame_cache *cache; struct trad_frame_cache *cache;
CORE_ADDR func, pc, sp; CORE_ADDR func, pc, sp;
const char *name; const char *name;
int i; int i, tf_size;
if (*this_cache != NULL) if (*this_cache != NULL)
return ((struct trad_frame_cache *)*this_cache); return ((struct trad_frame_cache *)*this_cache);
const struct regcache_map_entry *trapframe_map;
if (info->osreldate >= 1400084)
{
trapframe_map = aarch64_fbsd_trapframe_map;
}
else
{
trapframe_map = aarch64_fbsd13_trapframe_map;
}
cache = trad_frame_cache_zalloc (this_frame); cache = trad_frame_cache_zalloc (this_frame);
*this_cache = cache; *this_cache = cache;
func = get_frame_func (this_frame); func = get_frame_func (this_frame);
sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM); sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
find_pc_partial_function (func, &name, NULL, NULL); find_pc_partial_function (func, &name, NULL, NULL);
if (strcmp(name, "fork_trampoline") == 0 && get_frame_pc (this_frame) == func)
{
/* fork_exit hasn't been called (kthread has never run), so SP
hasn't been initialized yet. The stack pointer is stored in
the X2 in the pcb. */
sp = get_frame_register_unsigned (this_frame, AARCH64_X0_REGNUM + 2);
}
trad_frame_set_reg_addr (cache, AARCH64_SP_REGNUM, sp); tf_size = regcache_map_entry_size (trapframe_map);
trad_frame_set_reg_addr (cache, AARCH64_LR_REGNUM, sp + 8); trad_frame_set_reg_regmap (cache, trapframe_map, sp, tf_size);
trad_frame_set_reg_addr (cache, AARCH64_PC_REGNUM, sp + 16);
trad_frame_set_reg_addr (cache, AARCH64_CPSR_REGNUM, sp + 24);
for (i = 0; i < 30; i++)
trad_frame_set_reg_addr (cache, AARCH64_X0_REGNUM + i, sp + 32 + i * 8);
/* Read $PC from trap frame. */ /* Read $PC from trap frame. */
pc = read_memory_unsigned_integer (sp + 16, 8, byte_order); pc = read_memory_unsigned_integer (sp + 2 * 8, 8, byte_order);
if (pc == 0 && strcmp(name, "fork_trampoline") == 0) if (pc == 0 && strcmp(name, "fork_trampoline") == 0)
{ {
/* Initial frame of a kthread; terminate backtrace. */ /* Initial frame of a kthread; terminate backtrace. */
trad_frame_set_id (cache, outer_frame_id); trad_frame_set_id (cache, outer_frame_id);
} }
else else
{ {
/* Construct the frame ID using the function start. */ /* Construct the frame ID using the function start. */
trad_frame_set_id (cache, frame_id_build (sp + 8 * 34, func)); trad_frame_set_id (cache, frame_id_build (sp + tf_size, func));
} }
return cache; return cache;
} }
static void static void
aarch64_fbsd_trapframe_this_id (frame_info_ptr this_frame, aarch64_fbsd_trapframe_this_id (frame_info_ptr this_frame,
void **this_cache, struct frame_id *this_id) void **this_cache, struct frame_id *this_id)
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