/* GNU/Linux/ARM specific low level interface, for the remote server for GDB.
- Copyright (C) 1995-1996, 1998-2012 Free Software Foundation, Inc.
+ Copyright (C) 1995-2019 Free Software Foundation, Inc.
This file is part of GDB.
#include "server.h"
#include "linux-low.h"
+#include "arch/arm.h"
+#include "arch/arm-linux.h"
+#include "arch/arm-get-next-pcs.h"
+#include "linux-aarch32-low.h"
+#include <sys/uio.h>
/* Don't include elf.h if linux/elf.h got included by gdb_proc_service.h.
On Bionic elf.h and linux/elf.h have conflicting definitions. */
#ifndef ELFMAG0
#include <elf.h>
#endif
-#include <sys/ptrace.h>
+#include "nat/gdb_ptrace.h"
#include <signal.h>
+#include <sys/syscall.h>
/* Defined in auto-generated files. */
void init_registers_arm (void);
+extern const struct target_desc *tdesc_arm;
+
void init_registers_arm_with_iwmmxt (void);
+extern const struct target_desc *tdesc_arm_with_iwmmxt;
+
void init_registers_arm_with_vfpv2 (void);
+extern const struct target_desc *tdesc_arm_with_vfpv2;
+
void init_registers_arm_with_vfpv3 (void);
-void init_registers_arm_with_neon (void);
+extern const struct target_desc *tdesc_arm_with_vfpv3;
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 22
CORE_ADDR stopped_data_address;
};
-static unsigned long arm_hwcap;
-
/* These are in <asm/elf.h> in current kernels. */
#define HWCAP_VFP 64
#define HWCAP_IWMMXT 512
64
};
+/* Forward declarations needed for get_next_pcs ops. */
+static ULONGEST get_next_pcs_read_memory_unsigned_integer (CORE_ADDR memaddr,
+ int len,
+ int byte_order);
+
+static CORE_ADDR get_next_pcs_addr_bits_remove (struct arm_get_next_pcs *self,
+ CORE_ADDR val);
+
+static CORE_ADDR get_next_pcs_syscall_next_pc (struct arm_get_next_pcs *self);
+
+static int get_next_pcs_is_thumb (struct arm_get_next_pcs *self);
+
+/* get_next_pcs operations. */
+static struct arm_get_next_pcs_ops get_next_pcs_ops = {
+ get_next_pcs_read_memory_unsigned_integer,
+ get_next_pcs_syscall_next_pc,
+ get_next_pcs_addr_bits_remove,
+ get_next_pcs_is_thumb,
+ arm_linux_get_next_pcs_fixup,
+};
+
static int
arm_cannot_store_register (int regno)
{
return (regno >= arm_num_regs);
}
-static void
-arm_fill_gregset (struct regcache *regcache, void *buf)
-{
- int i;
-
- for (i = 0; i < arm_num_regs; i++)
- if (arm_regmap[i] != -1)
- collect_register (regcache, i, ((char *) buf) + arm_regmap[i]);
-}
-
-static void
-arm_store_gregset (struct regcache *regcache, const void *buf)
-{
- int i;
- char zerobuf[8];
-
- memset (zerobuf, 0, 8);
- for (i = 0; i < arm_num_regs; i++)
- if (arm_regmap[i] != -1)
- supply_register (regcache, i, ((char *) buf) + arm_regmap[i]);
- else
- supply_register (regcache, i, zerobuf);
-}
-
static void
arm_fill_wmmxregset (struct regcache *regcache, void *buf)
{
int i;
- if (!(arm_hwcap & HWCAP_IWMMXT))
+ if (regcache->tdesc != tdesc_arm_with_iwmmxt)
return;
for (i = 0; i < 16; i++)
{
int i;
- if (!(arm_hwcap & HWCAP_IWMMXT))
+ if (regcache->tdesc != tdesc_arm_with_iwmmxt)
return;
for (i = 0; i < 16; i++)
static void
arm_fill_vfpregset (struct regcache *regcache, void *buf)
{
- int i, num, base;
-
- if (!(arm_hwcap & HWCAP_VFP))
- return;
+ int num;
- if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
+ if (regcache->tdesc == tdesc_arm_with_neon
+ || regcache->tdesc == tdesc_arm_with_vfpv3)
num = 32;
- else
+ else if (regcache->tdesc == tdesc_arm_with_vfpv2)
num = 16;
+ else
+ return;
- base = find_regno ("d0");
- for (i = 0; i < num; i++)
- collect_register (regcache, base + i, (char *) buf + i * 8);
+ arm_fill_vfpregset_num (regcache, buf, num);
+}
- collect_register_by_name (regcache, "fpscr", (char *) buf + 32 * 8);
+/* Wrapper of UNMAKE_THUMB_ADDR for get_next_pcs. */
+static CORE_ADDR
+get_next_pcs_addr_bits_remove (struct arm_get_next_pcs *self, CORE_ADDR val)
+{
+ return UNMAKE_THUMB_ADDR (val);
}
static void
arm_store_vfpregset (struct regcache *regcache, const void *buf)
{
- int i, num, base;
+ int num;
- if (!(arm_hwcap & HWCAP_VFP))
- return;
-
- if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
+ if (regcache->tdesc == tdesc_arm_with_neon
+ || regcache->tdesc == tdesc_arm_with_vfpv3)
num = 32;
- else
+ else if (regcache->tdesc == tdesc_arm_with_vfpv2)
num = 16;
+ else
+ return;
- base = find_regno ("d0");
- for (i = 0; i < num; i++)
- supply_register (regcache, base + i, (char *) buf + i * 8);
-
- supply_register_by_name (regcache, "fpscr", (char *) buf + 32 * 8);
-}
-
-extern int debug_threads;
-
-static CORE_ADDR
-arm_get_pc (struct regcache *regcache)
-{
- unsigned long pc;
- collect_register_by_name (regcache, "pc", &pc);
- if (debug_threads)
- fprintf (stderr, "stop pc is %08lx\n", pc);
- return pc;
+ arm_store_vfpregset_num (regcache, buf, num);
}
-static void
-arm_set_pc (struct regcache *regcache, CORE_ADDR pc)
+/* Wrapper of arm_is_thumb_mode for get_next_pcs. */
+static int
+get_next_pcs_is_thumb (struct arm_get_next_pcs *self)
{
- unsigned long newpc = pc;
- supply_register_by_name (regcache, "pc", &newpc);
+ return arm_is_thumb_mode ();
}
-/* Correct in either endianness. */
-static const unsigned long arm_breakpoint = 0xef9f0001;
-#define arm_breakpoint_len 4
-static const unsigned short thumb_breakpoint = 0xde01;
-static const unsigned short thumb2_breakpoint[] = { 0xf7f0, 0xa000 };
-
-/* For new EABI binaries. We recognize it regardless of which ABI
- is used for gdbserver, so single threaded debugging should work
- OK, but for multi-threaded debugging we only insert the current
- ABI's breakpoint instruction. For now at least. */
-static const unsigned long arm_eabi_breakpoint = 0xe7f001f0;
-
-static int
-arm_breakpoint_at (CORE_ADDR where)
+/* Read memory from the inferiror.
+ BYTE_ORDER is ignored and there to keep compatiblity with GDB's
+ read_memory_unsigned_integer. */
+static ULONGEST
+get_next_pcs_read_memory_unsigned_integer (CORE_ADDR memaddr,
+ int len,
+ int byte_order)
{
- struct regcache *regcache = get_thread_regcache (current_inferior, 1);
- unsigned long cpsr;
+ ULONGEST res;
- collect_register_by_name (regcache, "cpsr", &cpsr);
+ res = 0;
+ target_read_memory (memaddr, (unsigned char *) &res, len);
- if (cpsr & 0x20)
- {
- /* Thumb mode. */
- unsigned short insn;
-
- (*the_target->read_memory) (where, (unsigned char *) &insn, 2);
- if (insn == thumb_breakpoint)
- return 1;
-
- if (insn == thumb2_breakpoint[0])
- {
- (*the_target->read_memory) (where + 2, (unsigned char *) &insn, 2);
- if (insn == thumb2_breakpoint[1])
- return 1;
- }
- }
- else
- {
- /* ARM mode. */
- unsigned long insn;
-
- (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
- if (insn == arm_breakpoint)
- return 1;
-
- if (insn == arm_eabi_breakpoint)
- return 1;
- }
-
- return 0;
-}
-
-/* We only place breakpoints in empty marker functions, and thread locking
- is outside of the function. So rather than importing software single-step,
- we can just run until exit. */
-static CORE_ADDR
-arm_reinsert_addr (void)
-{
- struct regcache *regcache = get_thread_regcache (current_inferior, 1);
- unsigned long pc;
- collect_register_by_name (regcache, "lr", &pc);
- return pc;
+ return res;
}
/* Fetch the thread-local storage pointer for libthread_db. */
ps_err_e
-ps_get_thread_area (const struct ps_prochandle *ph,
+ps_get_thread_area (struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
return p1->address == p2->address && p1->control == p2->control;
}
+/* Convert a raw breakpoint type to an enum arm_hwbp_type. */
+
+static arm_hwbp_type
+raw_bkpt_type_to_arm_hwbp_type (enum raw_bkpt_type raw_type)
+{
+ switch (raw_type)
+ {
+ case raw_bkpt_type_hw:
+ return arm_hwbp_break;
+ case raw_bkpt_type_write_wp:
+ return arm_hwbp_store;
+ case raw_bkpt_type_read_wp:
+ return arm_hwbp_load;
+ case raw_bkpt_type_access_wp:
+ return arm_hwbp_access;
+ default:
+ gdb_assert_not_reached ("unhandled raw type");
+ }
+}
+
/* Initialize the hardware breakpoint structure P for a breakpoint or
watchpoint at ADDR to LEN. The type of watchpoint is given in TYPE.
- Returns -1 if TYPE is unsupported, 0 if TYPE represents a breakpoint,
- and 1 if type represents a watchpoint. */
+ Returns -1 if TYPE is unsupported, or -2 if the particular combination
+ of ADDR and LEN cannot be implemented. Otherwise, returns 0 if TYPE
+ represents a breakpoint and 1 if type represents a watchpoint. */
static int
-arm_linux_hw_point_initialize (char type, CORE_ADDR addr, int len,
- struct arm_linux_hw_breakpoint *p)
+arm_linux_hw_point_initialize (enum raw_bkpt_type raw_type, CORE_ADDR addr,
+ int len, struct arm_linux_hw_breakpoint *p)
{
arm_hwbp_type hwbp_type;
unsigned mask;
- /* Breakpoint/watchpoint types (GDB terminology):
- 0 = memory breakpoint for instructions
- (not supported; done via memory write instead)
- 1 = hardware breakpoint for instructions (supported)
- 2 = write watchpoint (supported)
- 3 = read watchpoint (supported)
- 4 = access watchpoint (supported). */
- switch (type)
- {
- case '1':
- hwbp_type = arm_hwbp_break;
- break;
- case '2':
- hwbp_type = arm_hwbp_store;
- break;
- case '3':
- hwbp_type = arm_hwbp_load;
- break;
- case '4':
- hwbp_type = arm_hwbp_access;
- break;
- default:
- /* Unsupported. */
- return -1;
- }
+ hwbp_type = raw_bkpt_type_to_arm_hwbp_type (raw_type);
if (hwbp_type == arm_hwbp_break)
{
break;
default:
/* Unsupported. */
- return -1;
+ return -2;
}
}
else
/* Can not set watchpoints for zero or negative lengths. */
if (len <= 0)
- return -1;
+ return -2;
/* The current ptrace interface can only handle watchpoints that are a
power of 2. */
if ((len & (len - 1)) != 0)
- return -1;
+ return -2;
/* Test that the range [ADDR, ADDR + LEN) fits into the largest address
range covered by a watchpoint. */
aligned_addr = addr & ~(max_wp_length - 1);
if (aligned_addr + max_wp_length < addr + len)
- return -1;
+ return -2;
mask = (1 << len) - 1;
}
/* Callback to mark a watch-/breakpoint to be updated in all threads of
the current process. */
-struct update_registers_data
+static void
+update_registers_callback (thread_info *thread, int watch, int i)
{
- int watch;
- int i;
-};
+ struct lwp_info *lwp = get_thread_lwp (thread);
+
+ /* The actual update is done later just before resuming the lwp,
+ we just mark that the registers need updating. */
+ if (watch)
+ lwp->arch_private->wpts_changed[i] = 1;
+ else
+ lwp->arch_private->bpts_changed[i] = 1;
+
+ /* If the lwp isn't stopped, force it to momentarily pause, so
+ we can update its breakpoint registers. */
+ if (!lwp->stopped)
+ linux_stop_lwp (lwp);
+}
static int
-update_registers_callback (struct inferior_list_entry *entry, void *arg)
+arm_supports_z_point_type (char z_type)
{
- struct lwp_info *lwp = (struct lwp_info *) entry;
- struct update_registers_data *data = (struct update_registers_data *) arg;
-
- /* Only update the threads of the current process. */
- if (pid_of (lwp) == pid_of (get_thread_lwp (current_inferior)))
+ switch (z_type)
{
- /* The actual update is done later just before resuming the lwp,
- we just mark that the registers need updating. */
- if (data->watch)
- lwp->arch_private->wpts_changed[data->i] = 1;
- else
- lwp->arch_private->bpts_changed[data->i] = 1;
-
- /* If the lwp isn't stopped, force it to momentarily pause, so
- we can update its breakpoint registers. */
- if (!lwp->stopped)
- linux_stop_lwp (lwp);
+ case Z_PACKET_SW_BP:
+ case Z_PACKET_HW_BP:
+ case Z_PACKET_WRITE_WP:
+ case Z_PACKET_READ_WP:
+ case Z_PACKET_ACCESS_WP:
+ return 1;
+ default:
+ /* Leave the handling of sw breakpoints with the gdb client. */
+ return 0;
}
-
- return 0;
}
/* Insert hardware break-/watchpoint. */
static int
-arm_insert_point (char type, CORE_ADDR addr, int len)
+arm_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int len, struct raw_breakpoint *bp)
{
struct process_info *proc = current_process ();
struct arm_linux_hw_breakpoint p, *pts;
if (watch < 0)
{
/* Unsupported. */
- return 1;
+ return watch == -1 ? 1 : -1;
}
if (watch)
{
count = arm_linux_get_hw_watchpoint_count ();
- pts = proc->private->arch_private->wpts;
+ pts = proc->priv->arch_private->wpts;
}
else
{
count = arm_linux_get_hw_breakpoint_count ();
- pts = proc->private->arch_private->bpts;
+ pts = proc->priv->arch_private->bpts;
}
for (i = 0; i < count; i++)
if (!arm_hwbp_control_is_enabled (pts[i].control))
{
- struct update_registers_data data = { watch, i };
pts[i] = p;
- find_inferior (&all_lwps, update_registers_callback, &data);
+
+ /* Only update the threads of the current process. */
+ for_each_thread (current_thread->id.pid (), [&] (thread_info *thread)
+ {
+ update_registers_callback (thread, watch, i);
+ });
+
return 0;
}
/* Remove hardware break-/watchpoint. */
static int
-arm_remove_point (char type, CORE_ADDR addr, int len)
+arm_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int len, struct raw_breakpoint *bp)
{
struct process_info *proc = current_process ();
struct arm_linux_hw_breakpoint p, *pts;
if (watch)
{
count = arm_linux_get_hw_watchpoint_count ();
- pts = proc->private->arch_private->wpts;
+ pts = proc->priv->arch_private->wpts;
}
else
{
count = arm_linux_get_hw_breakpoint_count ();
- pts = proc->private->arch_private->bpts;
+ pts = proc->priv->arch_private->bpts;
}
for (i = 0; i < count; i++)
if (arm_linux_hw_breakpoint_equal (&p, pts + i))
{
- struct update_registers_data data = { watch, i };
pts[i].control = arm_hwbp_control_disable (pts[i].control);
- find_inferior (&all_lwps, update_registers_callback, &data);
+
+ /* Only update the threads of the current process. */
+ for_each_thread (current_thread->id.pid (), [&] (thread_info *thread)
+ {
+ update_registers_callback (thread, watch, i);
+ });
+
return 0;
}
static int
arm_stopped_by_watchpoint (void)
{
- struct lwp_info *lwp = get_thread_lwp (current_inferior);
+ struct lwp_info *lwp = get_thread_lwp (current_thread);
siginfo_t siginfo;
/* We must be able to set hardware watchpoints. */
/* Retrieve siginfo. */
errno = 0;
- ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &siginfo);
+ ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), 0, &siginfo);
if (errno != 0)
return 0;
static CORE_ADDR
arm_stopped_data_address (void)
{
- struct lwp_info *lwp = get_thread_lwp (current_inferior);
+ struct lwp_info *lwp = get_thread_lwp (current_thread);
return lwp->arch_private->stopped_data_address;
}
static struct arch_process_info *
arm_new_process (void)
{
- struct arch_process_info *info = xcalloc (1, sizeof (*info));
+ struct arch_process_info *info = XCNEW (struct arch_process_info);
return info;
}
+/* Called when a process is being deleted. */
+
+static void
+arm_delete_process (struct arch_process_info *info)
+{
+ xfree (info);
+}
+
/* Called when a new thread is detected. */
-static struct arch_lwp_info *
-arm_new_thread (void)
+static void
+arm_new_thread (struct lwp_info *lwp)
{
- struct arch_lwp_info *info = xcalloc (1, sizeof (*info));
+ struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
int i;
for (i = 0; i < MAX_BPTS; i++)
for (i = 0; i < MAX_WPTS; i++)
info->wpts_changed[i] = 1;
- return info;
+ lwp->arch_private = info;
+}
+
+/* Function to call when a thread is being deleted. */
+
+static void
+arm_delete_thread (struct arch_lwp_info *arch_lwp)
+{
+ xfree (arch_lwp);
+}
+
+static void
+arm_new_fork (struct process_info *parent, struct process_info *child)
+{
+ struct arch_process_info *parent_proc_info;
+ struct arch_process_info *child_proc_info;
+ struct lwp_info *child_lwp;
+ struct arch_lwp_info *child_lwp_info;
+ int i;
+
+ /* These are allocated by linux_add_process. */
+ gdb_assert (parent->priv != NULL
+ && parent->priv->arch_private != NULL);
+ gdb_assert (child->priv != NULL
+ && child->priv->arch_private != NULL);
+
+ parent_proc_info = parent->priv->arch_private;
+ child_proc_info = child->priv->arch_private;
+
+ /* Linux kernel before 2.6.33 commit
+ 72f674d203cd230426437cdcf7dd6f681dad8b0d
+ will inherit hardware debug registers from parent
+ on fork/vfork/clone. Newer Linux kernels create such tasks with
+ zeroed debug registers.
+
+ GDB core assumes the child inherits the watchpoints/hw
+ breakpoints of the parent, and will remove them all from the
+ forked off process. Copy the debug registers mirrors into the
+ new process so that all breakpoints and watchpoints can be
+ removed together. The debug registers mirror will become zeroed
+ in the end before detaching the forked off process, thus making
+ this compatible with older Linux kernels too. */
+
+ *child_proc_info = *parent_proc_info;
+
+ /* Mark all the hardware breakpoints and watchpoints as changed to
+ make sure that the registers will be updated. */
+ child_lwp = find_lwp_pid (ptid_t (child->pid));
+ child_lwp_info = child_lwp->arch_private;
+ for (i = 0; i < MAX_BPTS; i++)
+ child_lwp_info->bpts_changed[i] = 1;
+ for (i = 0; i < MAX_WPTS; i++)
+ child_lwp_info->wpts_changed[i] = 1;
}
/* Called when resuming a thread.
static void
arm_prepare_to_resume (struct lwp_info *lwp)
{
- int pid = lwpid_of (lwp);
- struct process_info *proc = find_process_pid (pid_of (lwp));
- struct arch_process_info *proc_info = proc->private->arch_private;
+ struct thread_info *thread = get_lwp_thread (lwp);
+ int pid = lwpid_of (thread);
+ struct process_info *proc = find_process_pid (pid_of (thread));
+ struct arch_process_info *proc_info = proc->priv->arch_private;
struct arch_lwp_info *lwp_info = lwp->arch_private;
int i;
if (arm_hwbp_control_is_enabled (proc_info->bpts[i].control))
if (ptrace (PTRACE_SETHBPREGS, pid,
- (PTRACE_ARG3_TYPE) ((i << 1) + 1),
+ (PTRACE_TYPE_ARG3) ((i << 1) + 1),
&proc_info->bpts[i].address) < 0)
perror_with_name ("Unexpected error setting breakpoint address");
if (arm_hwbp_control_is_initialized (proc_info->bpts[i].control))
if (ptrace (PTRACE_SETHBPREGS, pid,
- (PTRACE_ARG3_TYPE) ((i << 1) + 2),
+ (PTRACE_TYPE_ARG3) ((i << 1) + 2),
&proc_info->bpts[i].control) < 0)
perror_with_name ("Unexpected error setting breakpoint");
if (arm_hwbp_control_is_enabled (proc_info->wpts[i].control))
if (ptrace (PTRACE_SETHBPREGS, pid,
- (PTRACE_ARG3_TYPE) -((i << 1) + 1),
+ (PTRACE_TYPE_ARG3) -((i << 1) + 1),
&proc_info->wpts[i].address) < 0)
perror_with_name ("Unexpected error setting watchpoint address");
if (arm_hwbp_control_is_initialized (proc_info->wpts[i].control))
if (ptrace (PTRACE_SETHBPREGS, pid,
- (PTRACE_ARG3_TYPE) -((i << 1) + 2),
+ (PTRACE_TYPE_ARG3) -((i << 1) + 2),
&proc_info->wpts[i].control) < 0)
perror_with_name ("Unexpected error setting watchpoint");
}
}
+/* Find the next pc for a sigreturn or rt_sigreturn syscall. In
+ addition, set IS_THUMB depending on whether we will return to ARM
+ or Thumb code.
+ See arm-linux.h for stack layout details. */
+static CORE_ADDR
+arm_sigreturn_next_pc (struct regcache *regcache, int svc_number,
+ int *is_thumb)
+{
+ unsigned long sp;
+ unsigned long sp_data;
+ /* Offset of PC register. */
+ int pc_offset = 0;
+ CORE_ADDR next_pc = 0;
+ uint32_t cpsr;
+
+ gdb_assert (svc_number == __NR_sigreturn || svc_number == __NR_rt_sigreturn);
+
+ collect_register_by_name (regcache, "sp", &sp);
+ (*the_target->read_memory) (sp, (unsigned char *) &sp_data, 4);
+
+ pc_offset = arm_linux_sigreturn_next_pc_offset
+ (sp, sp_data, svc_number, __NR_sigreturn == svc_number ? 1 : 0);
+
+ (*the_target->read_memory) (sp + pc_offset, (unsigned char *) &next_pc, 4);
+
+ /* Set IS_THUMB according the CPSR saved on the stack. */
+ (*the_target->read_memory) (sp + pc_offset + 4, (unsigned char *) &cpsr, 4);
+ *is_thumb = ((cpsr & CPSR_T) != 0);
+
+ return next_pc;
+}
+
+/* When PC is at a syscall instruction, return the PC of the next
+ instruction to be executed. */
+static CORE_ADDR
+get_next_pcs_syscall_next_pc (struct arm_get_next_pcs *self)
+{
+ CORE_ADDR next_pc = 0;
+ CORE_ADDR pc = regcache_read_pc (self->regcache);
+ int is_thumb = arm_is_thumb_mode ();
+ ULONGEST svc_number = 0;
+ struct regcache *regcache = self->regcache;
+
+ if (is_thumb)
+ {
+ collect_register (regcache, 7, &svc_number);
+ next_pc = pc + 2;
+ }
+ else
+ {
+ unsigned long this_instr;
+ unsigned long svc_operand;
+
+ target_read_memory (pc, (unsigned char *) &this_instr, 4);
+ svc_operand = (0x00ffffff & this_instr);
+
+ if (svc_operand) /* OABI. */
+ {
+ svc_number = svc_operand - 0x900000;
+ }
+ else /* EABI. */
+ {
+ collect_register (regcache, 7, &svc_number);
+ }
+
+ next_pc = pc + 4;
+ }
+
+ /* This is a sigreturn or sigreturn_rt syscall. */
+ if (svc_number == __NR_sigreturn || svc_number == __NR_rt_sigreturn)
+ {
+ /* SIGRETURN or RT_SIGRETURN may affect the arm thumb mode, so
+ update IS_THUMB. */
+ next_pc = arm_sigreturn_next_pc (regcache, svc_number, &is_thumb);
+ }
+
+ /* Addresses for calling Thumb functions have the bit 0 set. */
+ if (is_thumb)
+ next_pc = MAKE_THUMB_ADDR (next_pc);
+
+ return next_pc;
+}
static int
arm_get_hwcap (unsigned long *valp)
{
- unsigned char *data = alloca (8);
+ unsigned char *data = (unsigned char *) alloca (8);
int offset = 0;
while ((*the_target->read_auxv) (offset, data, 8) == 8)
return 0;
}
-static void
-arm_arch_setup (void)
+static const struct target_desc *
+arm_read_description (void)
{
- int pid = lwpid_of (get_thread_lwp (current_inferior));
+ int pid = lwpid_of (current_thread);
+ unsigned long arm_hwcap = 0;
/* Query hardware watchpoint/breakpoint capabilities. */
arm_linux_init_hwbp_cap (pid);
- arm_hwcap = 0;
if (arm_get_hwcap (&arm_hwcap) == 0)
- {
- init_registers_arm ();
- return;
- }
+ return tdesc_arm;
if (arm_hwcap & HWCAP_IWMMXT)
- {
- init_registers_arm_with_iwmmxt ();
- return;
- }
+ return tdesc_arm_with_iwmmxt;
if (arm_hwcap & HWCAP_VFP)
{
+ const struct target_desc *result;
char *buf;
/* NEON implies either no VFP, or VFPv3-D32. We only support
it with VFP. */
if (arm_hwcap & HWCAP_NEON)
- init_registers_arm_with_neon ();
+ result = tdesc_arm_with_neon;
else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
- init_registers_arm_with_vfpv3 ();
+ result = tdesc_arm_with_vfpv3;
else
- init_registers_arm_with_vfpv2 ();
+ result = tdesc_arm_with_vfpv2;
/* Now make sure that the kernel supports reading these
registers. Support was added in 2.6.30. */
errno = 0;
- buf = xmalloc (32 * 8 + 4);
+ buf = (char *) xmalloc (32 * 8 + 4);
if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0
&& errno == EIO)
- {
- arm_hwcap = 0;
- init_registers_arm ();
- }
+ result = tdesc_arm;
+
free (buf);
- return;
+ return result;
}
/* The default configuration uses legacy FPA registers, probably
simulated. */
- init_registers_arm ();
+ return tdesc_arm;
+}
+
+static void
+arm_arch_setup (void)
+{
+ int tid = lwpid_of (current_thread);
+ int gpregs[18];
+ struct iovec iov;
+
+ current_process ()->tdesc = arm_read_description ();
+
+ iov.iov_base = gpregs;
+ iov.iov_len = sizeof (gpregs);
+
+ /* Check if PTRACE_GETREGSET works. */
+ if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iov) == 0)
+ have_ptrace_getregset = 1;
+ else
+ have_ptrace_getregset = 0;
+}
+
+/* Fetch the next possible PCs after the current instruction executes. */
+
+static std::vector<CORE_ADDR>
+arm_gdbserver_get_next_pcs (struct regcache *regcache)
+{
+ struct arm_get_next_pcs next_pcs_ctx;
+
+ arm_get_next_pcs_ctor (&next_pcs_ctx,
+ &get_next_pcs_ops,
+ /* Byte order is ignored assumed as host. */
+ 0,
+ 0,
+ 1,
+ regcache);
+
+ return arm_get_next_pcs (&next_pcs_ctx);
}
-struct regset_info target_regsets[] = {
+/* Support for hardware single step. */
+
+static int
+arm_supports_hardware_single_step (void)
+{
+ return 0;
+}
+
+/* Implementation of linux_target_ops method "get_syscall_trapinfo". */
+
+static void
+arm_get_syscall_trapinfo (struct regcache *regcache, int *sysno)
+{
+ if (arm_is_thumb_mode ())
+ collect_register_by_name (regcache, "r7", sysno);
+ else
+ {
+ unsigned long pc;
+ unsigned long insn;
+
+ collect_register_by_name (regcache, "pc", &pc);
+
+ if ((*the_target->read_memory) (pc - 4, (unsigned char *) &insn, 4))
+ *sysno = UNKNOWN_SYSCALL;
+ else
+ {
+ unsigned long svc_operand = (0x00ffffff & insn);
+
+ if (svc_operand)
+ {
+ /* OABI */
+ *sysno = svc_operand - 0x900000;
+ }
+ else
+ {
+ /* EABI */
+ collect_register_by_name (regcache, "r7", sysno);
+ }
+ }
+ }
+}
+
+/* Register sets without using PTRACE_GETREGSET. */
+
+static struct regset_info arm_regsets[] = {
{ PTRACE_GETREGS, PTRACE_SETREGS, 0, 18 * 4,
GENERAL_REGS,
arm_fill_gregset, arm_store_gregset },
{ PTRACE_GETVFPREGS, PTRACE_SETVFPREGS, 0, 32 * 8 + 4,
EXTENDED_REGS,
arm_fill_vfpregset, arm_store_vfpregset },
- { 0, 0, 0, -1, -1, NULL, NULL }
+ NULL_REGSET
};
+static struct regsets_info arm_regsets_info =
+ {
+ arm_regsets, /* regsets */
+ 0, /* num_regsets */
+ NULL, /* disabled_regsets */
+ };
+
+static struct usrregs_info arm_usrregs_info =
+ {
+ arm_num_regs,
+ arm_regmap,
+ };
+
+static struct regs_info regs_info_arm =
+ {
+ NULL, /* regset_bitmap */
+ &arm_usrregs_info,
+ &arm_regsets_info
+ };
+
+static const struct regs_info *
+arm_regs_info (void)
+{
+ const struct target_desc *tdesc = current_process ()->tdesc;
+
+ if (have_ptrace_getregset == 1
+ && (tdesc == tdesc_arm_with_neon || tdesc == tdesc_arm_with_vfpv3))
+ return ®s_info_aarch32;
+ else
+ return ®s_info_arm;
+}
+
struct linux_target_ops the_low_target = {
arm_arch_setup,
- arm_num_regs,
- arm_regmap,
- NULL,
+ arm_regs_info,
arm_cannot_fetch_register,
arm_cannot_store_register,
NULL, /* fetch_register */
- arm_get_pc,
- arm_set_pc,
-
- /* Define an ARM-mode breakpoint; we only set breakpoints in the C
- library, which is most likely to be ARM. If the kernel supports
- clone events, we will never insert a breakpoint, so even a Thumb
- C library will work; so will mixing EABI/non-EABI gdbserver and
- application. */
-#ifndef __ARM_EABI__
- (const unsigned char *) &arm_breakpoint,
-#else
- (const unsigned char *) &arm_eabi_breakpoint,
-#endif
- arm_breakpoint_len,
- arm_reinsert_addr,
+ linux_get_pc_32bit,
+ linux_set_pc_32bit,
+ arm_breakpoint_kind_from_pc,
+ arm_sw_breakpoint_from_kind,
+ arm_gdbserver_get_next_pcs,
0,
arm_breakpoint_at,
+ arm_supports_z_point_type,
arm_insert_point,
arm_remove_point,
arm_stopped_by_watchpoint,
NULL, /* supply_ptrace_register */
NULL, /* siginfo_fixup */
arm_new_process,
+ arm_delete_process,
arm_new_thread,
+ arm_delete_thread,
+ arm_new_fork,
arm_prepare_to_resume,
+ NULL, /* process_qsupported */
+ NULL, /* supports_tracepoints */
+ NULL, /* get_thread_area */
+ NULL, /* install_fast_tracepoint_jump_pad */
+ NULL, /* emit_ops */
+ NULL, /* get_min_fast_tracepoint_insn_len */
+ NULL, /* supports_range_stepping */
+ arm_breakpoint_kind_from_current_state,
+ arm_supports_hardware_single_step,
+ arm_get_syscall_trapinfo,
};
+
+void
+initialize_low_arch (void)
+{
+ /* Initialize the Linux target descriptions. */
+ init_registers_arm ();
+ init_registers_arm_with_iwmmxt ();
+ init_registers_arm_with_vfpv2 ();
+ init_registers_arm_with_vfpv3 ();
+
+ initialize_low_arch_aarch32 ();
+
+ initialize_regsets_info (&arm_regsets_info);
+}
projects / deliverable / binutils-gdb.git / blobdiff