/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
- Copyright 1996, 1997, 1998, 1999, 2000, 2001
- Free Software Foundation, Inc.
+
+ Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software
+ Foundation, Inc.
This file is part of GDB.
#include "regcache.h"
#include "arch-utils.h"
+#define D0_REGNUM 0
+#define D2_REGNUM 2
+#define D3_REGNUM 3
+#define A0_REGNUM 4
+#define A2_REGNUM 6
+#define A3_REGNUM 7
+#define MDR_REGNUM 10
+#define PSW_REGNUM 11
+#define LIR_REGNUM 12
+#define LAR_REGNUM 13
+#define MDRQ_REGNUM 14
+#define E0_REGNUM 15
+#define MCRH_REGNUM 26
+#define MCRL_REGNUM 27
+#define MCVF_REGNUM 28
+
+enum movm_register_bits {
+ movm_exother_bit = 0x01,
+ movm_exreg1_bit = 0x02,
+ movm_exreg0_bit = 0x04,
+ movm_other_bit = 0x08,
+ movm_a3_bit = 0x10,
+ movm_a2_bit = 0x20,
+ movm_d3_bit = 0x40,
+ movm_d2_bit = 0x80
+};
+
extern void _initialize_mn10300_tdep (void);
static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi,
CORE_ADDR pc);
so we need a single byte breakpoint. Matsushita hasn't defined
one, so we defined it ourselves. */
-static unsigned char *
+const static unsigned char *
mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)
{
static char breakpoint[] =
/* The main purpose of this file is dealing with prologues to extract
information about stack frames and saved registers.
- For reference here's how prologues look on the mn10300:
+ In gcc/config/mn13000/mn10300.c, the expand_prologue prologue
+ function is pretty readable, and has a nice explanation of how the
+ prologue is generated. The prologues generated by that code will
+ have the following form (NOTE: the current code doesn't handle all
+ this!):
+
+ + If this is an old-style varargs function, then its arguments
+ need to be flushed back to the stack:
+
+ mov d0,(4,sp)
+ mov d1,(4,sp)
+
+ + If we use any of the callee-saved registers, save them now.
+
+ movm [some callee-saved registers],(sp)
+
+ + If we have any floating-point registers to save:
+
+ - Decrement the stack pointer to reserve space for the registers.
+ If the function doesn't need a frame pointer, we may combine
+ this with the adjustment that reserves space for the frame.
+
+ add -SIZE, sp
+
+ - Save the floating-point registers. We have two possible
+ strategies:
+
+ . Save them at fixed offset from the SP:
+
+ fmov fsN,(OFFSETN,sp)
+ fmov fsM,(OFFSETM,sp)
+ ...
+
+ Note that, if OFFSETN happens to be zero, you'll get the
+ different opcode: fmov fsN,(sp)
+
+ . Or, set a0 to the start of the save area, and then use
+ post-increment addressing to save the FP registers.
+
+ mov sp, a0
+ add SIZE, a0
+ fmov fsN,(a0+)
+ fmov fsM,(a0+)
+ ...
+
+ + If the function needs a frame pointer, we set it here.
- With frame pointer:
- movm [d2,d3,a2,a3],sp
- mov sp,a3
- add <size>,sp
+ mov sp, a3
- Without frame pointer:
- movm [d2,d3,a2,a3],sp (if needed)
- add <size>,sp
+ + Now we reserve space for the stack frame proper. This could be
+ merged into the `add -SIZE, sp' instruction for FP saves up
+ above, unless we needed to set the frame pointer in the previous
+ step, or the frame is so large that allocating the whole thing at
+ once would put the FP register save slots out of reach of the
+ addressing mode (128 bytes).
+
+ add -SIZE, sp
One day we might keep the stack pointer constant, that won't
change the code for prologues, but it will make the frame
save instructions.
MY_FRAME_IN_FP: The base of the current frame is in the
- frame pointer register ($a2).
+ frame pointer register ($a3).
NO_MORE_FRAMES: Set this if the current frame is "start" or
if the first instruction looks like mov <imm>,sp. This tells
return addr;
}
- /* First see if this insn sets the stack pointer; if so, it's something
- we won't understand, so quit now. */
+ /* First see if this insn sets the stack pointer from a register; if
+ so, it's probably the initialization of the stack pointer in _start,
+ so mark this as the bottom-most frame. */
if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0)
{
if (fi)
printf_filtered ("%s: ", name);
/* Get the data */
- if (read_relative_register_raw_bytes (regnum, raw_buffer))
+ if (!frame_register_read (selected_frame, regnum, raw_buffer))
{
printf_filtered ("[invalid]");
return;
else
{
int byte;
- if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
for (byte = REGISTER_RAW_SIZE (regnum) - REGISTER_VIRTUAL_SIZE (regnum);
byte < REGISTER_RAW_SIZE (regnum);
set_gdbarch_register_virtual_type (gdbarch, mn10300_register_virtual_type);
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum);
set_gdbarch_do_registers_info (gdbarch, mn10300_do_registers_info);
+ set_gdbarch_sp_regnum (gdbarch, 8);
+ set_gdbarch_pc_regnum (gdbarch, 9);
set_gdbarch_fp_regnum (gdbarch, 31);
set_gdbarch_virtual_frame_pointer (gdbarch, mn10300_virtual_frame_pointer);
projects / deliverable / binutils-gdb.git / blobdiff