/* Target-dependent code for the MIPS architecture, for GDB, the GNU Debugger.
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
#include "target-descriptions.h"
#include "dwarf2-frame.h"
#include "user-regs.h"
+#include "valprint.h"
static const struct objfile_data *mips_pdr_data;
CORE_ADDR end_prologue_addr = 0;
int seen_sp_adjust = 0;
int load_immediate_bytes = 0;
+ int in_delay_slot = 0;
struct gdbarch *gdbarch = get_frame_arch (this_frame);
int regsize_is_64_bits = (mips_abi_regsize (gdbarch) == 8);
instructions? */
if (end_prologue_addr == 0)
end_prologue_addr = cur_pc;
+
+ /* Check for branches and jumps. For now, only jump to
+ register are caught (i.e. returns). */
+ if ((itype_op (inst) & 0x07) == 0 && rtype_funct (inst) == 8)
+ in_delay_slot = 1;
}
+
+ /* If the previous instruction was a jump, we must have reached
+ the end of the prologue by now. Stop scanning so that we do
+ not go past the function return. */
+ if (in_delay_slot)
+ break;
}
if (this_cache != NULL)
gdb_byte dummy[4];
struct obj_section *s;
CORE_ADDR pc = get_frame_address_in_block (this_frame);
+ struct minimal_symbol *msym;
/* Use the stub unwinder for unreadable code. */
if (target_read_memory (get_frame_pc (this_frame), dummy, 4) != 0)
".MIPS.stubs") == 0)
return 1;
+ /* Calling a PIC function from a non-PIC function passes through a
+ stub. The stub for foo is named ".pic.foo". */
+ msym = lookup_minimal_symbol_by_pc (pc);
+ if (msym != NULL
+ && SYMBOL_LINKAGE_NAME (msym) != NULL
+ && strncmp (SYMBOL_LINKAGE_NAME (msym), ".pic.", 5) == 0)
+ return 1;
+
return 0;
}
struct type *field_type;
/* We're only looking at normal fields. */
- if (TYPE_FIELD_STATIC (arg_type, i)
+ if (field_is_static (&TYPE_FIELD (arg_type, i))
|| (TYPE_FIELD_BITPOS (arg_type, i) % 8) != 0)
continue;
if (register_size (gdbarch, regnum) == 4 || mips2_fp_compat (frame))
{
+ struct value_print_options opts;
+
/* 4-byte registers: Print hex and floating. Also print even
numbered registers as doubles. */
mips_read_fp_register_single (frame, regnum, raw_buffer);
flt1 = unpack_double (mips_float_register_type (), raw_buffer, &inv1);
- print_scalar_formatted (raw_buffer, builtin_type_uint32, 'x', 'w',
+ get_formatted_print_options (&opts, 'x');
+ print_scalar_formatted (raw_buffer, builtin_type_uint32, &opts, 'w',
file);
fprintf_filtered (file, " flt: ");
}
else
{
+ struct value_print_options opts;
+
/* Eight byte registers: print each one as hex, float and double. */
mips_read_fp_register_single (frame, regnum, raw_buffer);
flt1 = unpack_double (mips_float_register_type (), raw_buffer, &inv1);
mips_read_fp_register_double (frame, regnum, raw_buffer);
doub = unpack_double (mips_double_register_type (), raw_buffer, &inv2);
-
- print_scalar_formatted (raw_buffer, builtin_type_uint64, 'x', 'g',
+ get_formatted_print_options (&opts, 'x');
+ print_scalar_formatted (raw_buffer, builtin_type_uint64, &opts, 'g',
file);
fprintf_filtered (file, " flt: ");
struct gdbarch *gdbarch = get_frame_arch (frame);
gdb_byte raw_buffer[MAX_REGISTER_SIZE];
int offset;
+ struct value_print_options opts;
if (TYPE_CODE (register_type (gdbarch, regnum)) == TYPE_CODE_FLT)
{
else
offset = 0;
+ get_formatted_print_options (&opts, 'x');
print_scalar_formatted (raw_buffer + offset,
- register_type (gdbarch, regnum), 'x', 0,
+ register_type (gdbarch, regnum), &opts, 0,
file);
}
gory details. */
static CORE_ADDR
-mips_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
+mips_skip_mips16_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
{
char *name;
CORE_ADDR start_addr;
return 0; /* not a stub */
}
+/* If the current PC is the start of a non-PIC-to-PIC stub, return the
+ PC of the stub target. The stub just loads $t9 and jumps to it,
+ so that $t9 has the correct value at function entry. */
+
+static CORE_ADDR
+mips_skip_pic_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
+{
+ struct minimal_symbol *msym;
+ int i;
+ gdb_byte stub_code[16];
+ int32_t stub_words[4];
+
+ /* The stub for foo is named ".pic.foo", and is either two
+ instructions inserted before foo or a three instruction sequence
+ which jumps to foo. */
+ msym = lookup_minimal_symbol_by_pc (pc);
+ if (msym == NULL
+ || SYMBOL_VALUE_ADDRESS (msym) != pc
+ || SYMBOL_LINKAGE_NAME (msym) == NULL
+ || strncmp (SYMBOL_LINKAGE_NAME (msym), ".pic.", 5) != 0)
+ return 0;
+
+ /* A two-instruction header. */
+ if (MSYMBOL_SIZE (msym) == 8)
+ return pc + 8;
+
+ /* A three-instruction (plus delay slot) trampoline. */
+ if (MSYMBOL_SIZE (msym) == 16)
+ {
+ if (target_read_memory (pc, stub_code, 16) != 0)
+ return 0;
+ for (i = 0; i < 4; i++)
+ stub_words[i] = extract_unsigned_integer (stub_code + i * 4, 4);
+
+ /* A stub contains these instructions:
+ lui t9, %hi(target)
+ j target
+ addiu t9, t9, %lo(target)
+ nop
+
+ This works even for N64, since stubs are only generated with
+ -msym32. */
+ if ((stub_words[0] & 0xffff0000U) == 0x3c190000
+ && (stub_words[1] & 0xfc000000U) == 0x08000000
+ && (stub_words[2] & 0xffff0000U) == 0x27390000
+ && stub_words[3] == 0x00000000)
+ return (((stub_words[0] & 0x0000ffff) << 16)
+ + (stub_words[2] & 0x0000ffff));
+ }
+
+ /* Not a recognized stub. */
+ return 0;
+}
+
+static CORE_ADDR
+mips_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
+{
+ CORE_ADDR target_pc;
+
+ target_pc = mips_skip_mips16_trampoline_code (frame, pc);
+ if (target_pc)
+ return target_pc;
+
+ target_pc = find_solib_trampoline_target (frame, pc);
+ if (target_pc)
+ return target_pc;
+
+ target_pc = mips_skip_pic_trampoline_code (frame, pc);
+ if (target_pc)
+ return target_pc;
+
+ return 0;
+}
+
/* Convert a dbx stab register number (from `r' declaration) to a GDB
[1 * gdbarch_num_regs .. 2 * gdbarch_num_regs) REGNUM. */
projects / binutils-gdb.git / blobdiff