static struct disassemble_info
gdb_disassemble_info (struct gdbarch *gdbarch, struct ui_file *file)
{
struct disassemble_info di;
init_disassemble_info (&di, file, fprintf_disasm);
di.flavour = bfd_target_unknown_flavour;
di.memory_error_func = dis_asm_memory_error;
di.print_address_func = dis_asm_print_address;
/* NOTE: cagney/2003-04-28: The original code, from the old Insight
disassembler had a local optomization here. By default it would
access the executable file, instead of the target memory (there
was a growing list of exceptions though). Unfortunately, the
heuristic was flawed. Commands like "disassemble &variable"
didn't work as they relied on the access going to the target.
Further, it has been supperseeded by trust-read-only-sections
(although that should be superseeded by target_trust..._p()). */
di.read_memory_func = dis_asm_read_memory;
di.arch = gdbarch_bfd_arch_info (gdbarch)->arch;
di.mach = gdbarch_bfd_arch_info (gdbarch)->mach;
di.endian = gdbarch_byte_order (gdbarch);
di.endian_code = gdbarch_byte_order_for_code (gdbarch);
di.application_data = gdbarch;
disassemble_init_for_target (&di);
return di;
}
static LONGEST
arm_linux_get_syscall_number (struct gdbarch *gdbarch,
ptid_t ptid)
{
struct regcache *regs = get_thread_regcache (ptid);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
ULONGEST pc;
ULONGEST cpsr;
ULONGEST t_bit = arm_psr_thumb_bit (gdbarch);
int is_thumb;
ULONGEST svc_number = -1;
regcache_cooked_read_unsigned (regs, ARM_PC_REGNUM, &pc);
regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &cpsr);
is_thumb = (cpsr & t_bit) != 0;
if (is_thumb)
{
regcache_cooked_read_unsigned (regs, 7, &svc_number);
}
else
{
enum bfd_endian byte_order_for_code =
gdbarch_byte_order_for_code (gdbarch);
/* PC gets incremented before the syscall-stop, so read the
previous instruction. */
unsigned long this_instr =
read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code);
unsigned long svc_operand = (0x00ffffff & this_instr);
if (svc_operand)
{
/* OABI */
svc_number = svc_operand - 0x900000;
}
else
{
/* EABI */
regcache_cooked_read_unsigned (regs, 7, &svc_number);
}
}
return svc_number;
}
static CORE_ADDR
arm_linux_syscall_next_pc (struct frame_info *frame)
{
CORE_ADDR pc = get_frame_pc (frame);
CORE_ADDR return_addr = 0;
int is_thumb = arm_frame_is_thumb (frame);
ULONGEST svc_number = 0;
if (is_thumb)
{
svc_number = get_frame_register_unsigned (frame, 7);
return_addr = pc + 2;
}
else
{
struct gdbarch *gdbarch = get_frame_arch (frame);
enum bfd_endian byte_order_for_code =
gdbarch_byte_order_for_code (gdbarch);
unsigned long this_instr =
read_memory_unsigned_integer (pc, 4, byte_order_for_code);
unsigned long svc_operand = (0x00ffffff & this_instr);
if (svc_operand) /* OABI. */
{
svc_number = svc_operand - 0x900000;
}
else /* EABI. */
{
svc_number = get_frame_register_unsigned (frame, 7);
}
return_addr = pc + 4;
}
arm_linux_sigreturn_return_addr (frame, svc_number, &return_addr, &is_thumb);
/* Addresses for calling Thumb functions have the bit 0 set. */
if (is_thumb)
return_addr |= 1;
return return_addr;
}
static void
gdb_buffered_insn_length_init_dis (struct gdbarch *gdbarch,
struct disassemble_info *di,
const gdb_byte *insn, int max_len,
CORE_ADDR addr)
{
init_disassemble_info (di, NULL, gdb_buffered_insn_length_fprintf);
/* init_disassemble_info installs buffer_read_memory, etc.
so we don't need to do that here.
The cast is necessary until disassemble_info is const-ified. */
di->buffer = (gdb_byte *) insn;
di->buffer_length = max_len;
di->buffer_vma = addr;
di->arch = gdbarch_bfd_arch_info (gdbarch)->arch;
di->mach = gdbarch_bfd_arch_info (gdbarch)->mach;
di->endian = gdbarch_byte_order (gdbarch);
di->endian_code = gdbarch_byte_order_for_code (gdbarch);
disassemble_init_for_target (di);
}
