/* Target-dependent code for Atmel AVR, for GDB.
- Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
- 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+ Copyright (C) 1996-2021 Free Software Foundation, Inc.
This file is part of GDB.
#include "symfile.h"
#include "arch-utils.h"
#include "regcache.h"
-#include "gdb_string.h"
#include "dis-asm.h"
+#include "objfiles.h"
+#include <algorithm>
/* AVR Background:
(AVR micros are pure Harvard Architecture processors.)
The AVR family of microcontrollers have three distinctly different memory
- spaces: flash, sram and eeprom. The flash is 16 bits wide and is used for
- the most part to store program instructions. The sram is 8 bits wide and is
- used for the stack and the heap. Some devices lack sram and some can have
+ spaces: flash, sram and eeprom. The flash is 16 bits wide and is used for
+ the most part to store program instructions. The sram is 8 bits wide and is
+ used for the stack and the heap. Some devices lack sram and some can have
an additional external sram added on as a peripheral.
The eeprom is 8 bits wide and is used to store data when the device is
- powered down. Eeprom is not directly accessible, it can only be accessed
- via io-registers using a special algorithm. Accessing eeprom via gdb's
+ powered down. Eeprom is not directly accessible, it can only be accessed
+ via io-registers using a special algorithm. Accessing eeprom via gdb's
remote serial protocol ('m' or 'M' packets) looks difficult to do and is
not included at this time.
work, the remote target must be able to handle eeprom accesses and perform
the address translation.]
- All three memory spaces have physical addresses beginning at 0x0. In
+ All three memory spaces have physical addresses beginning at 0x0. In
addition, the flash is addressed by gcc/binutils/gdb with respect to 8 bit
bytes instead of the 16 bit wide words used by the real device for the
Program Counter.
In order for remote targets to work correctly, extra bits must be added to
addresses before they are send to the target or received from the target
- via the remote serial protocol. The extra bits are the MSBs and are used to
- decode which memory space the address is referring to. */
+ via the remote serial protocol. The extra bits are the MSBs and are used to
+ decode which memory space the address is referring to. */
-#undef XMALLOC
-#define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE)))
+/* Constants: prefixed with AVR_ to avoid name space clashes */
-#undef EXTRACT_INSN
-#define EXTRACT_INSN(addr) extract_unsigned_integer(addr,2)
+/* Address space flags */
+
+/* We are assigning the TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1 to the flash address
+ space. */
+
+#define AVR_TYPE_ADDRESS_CLASS_FLASH TYPE_ADDRESS_CLASS_1
+#define AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH \
+ TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1
-/* Constants: prefixed with AVR_ to avoid name space clashes */
enum
{
AVR_NUM_REGS = 32 + 1 /*SREG*/ + 1 /*SP*/ + 1 /*PC*/,
AVR_NUM_REG_BYTES = 32 + 1 /*SREG*/ + 2 /*SP*/ + 4 /*PC*/,
+ /* Pseudo registers. */
+ AVR_PSEUDO_PC_REGNUM = 35,
+ AVR_NUM_PSEUDO_REGS = 1,
+
AVR_PC_REG_INDEX = 35, /* index into array of registers */
AVR_MAX_PROLOGUE_SIZE = 64, /* bytes */
- /* Count of pushed registers. From r2 to r17 (inclusively), r28, r29 */
+ /* Count of pushed registers. From r2 to r17 (inclusively), r28, r29 */
AVR_MAX_PUSHES = 18,
- /* Number of the last pushed register. r17 for current avr-gcc */
+ /* Number of the last pushed register. r17 for current avr-gcc */
AVR_LAST_PUSHED_REGNUM = 17,
AVR_ARG1_REGNUM = 24, /* Single byte argument */
AVR_ARGN_REGNUM = 25, /* Multi byte argments */
+ AVR_LAST_ARG_REGNUM = 8, /* Last argument register */
AVR_RET1_REGNUM = 24, /* Single byte return value */
AVR_RETN_REGNUM = 25, /* Multi byte return value */
/* FIXME: TRoth/2002-01-??: Can we shift all these memory masks left 8
- bits? Do these have to match the bfd vma values?. It sure would make
+ bits? Do these have to match the bfd vma values? It sure would make
things easier in the future if they didn't need to match.
Note: I chose these values so as to be consistent with bfd vma
addresses.
TRoth/2002-04-08: There is already a conflict with very large programs
- in the mega128. The mega128 has 128K instruction bytes (64K words),
+ in the mega128. The mega128 has 128K instruction bytes (64K words),
thus the Most Significant Bit is 0x10000 which gets masked off my
AVR_MEM_MASK.
thus requires a 17-bit address.
For now, I've just removed the EEPROM mask and changed AVR_MEM_MASK
- from 0x00ff0000 to 0x00f00000. Eeprom is not accessible from gdb yet,
+ from 0x00ff0000 to 0x00f00000. Eeprom is not accessible from gdb yet,
but could be for some remote targets by just adding the correct offset
to the address and letting the remote target handle the low-level
- details of actually accessing the eeprom. */
+ details of actually accessing the eeprom. */
AVR_IMEM_START = 0x00000000, /* INSN memory */
AVR_SMEM_START = 0x00800000, /* SRAM memory */
int size;
int prologue_type;
/* Table indicating the location of each and every register. */
- struct trad_frame_saved_reg *saved_regs;
+ trad_frame_saved_reg *saved_regs;
};
struct gdbarch_tdep
{
/* Number of bytes stored to the stack by call instructions.
- 2 bytes for avr1-5, 3 bytes for avr6. */
+ 2 bytes for avr1-5 and avrxmega1-5, 3 bytes for avr6 and avrxmega6-7. */
int call_length;
+
+ /* Type for void. */
+ struct type *void_type;
+ /* Type for a function returning void. */
+ struct type *func_void_type;
+ /* Type for a pointer to a function. Used for the type of PC. */
+ struct type *pc_type;
};
-/* Lookup the name of a register given it's number. */
+/* Lookup the name of a register given it's number. */
static const char *
avr_register_name (struct gdbarch *gdbarch, int regnum)
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
- "SREG", "SP", "PC"
+ "SREG", "SP", "PC2",
+ "pc"
};
if (regnum < 0)
return NULL;
avr_register_type (struct gdbarch *gdbarch, int reg_nr)
{
if (reg_nr == AVR_PC_REGNUM)
- return builtin_type_uint32;
+ return builtin_type (gdbarch)->builtin_uint32;
+ if (reg_nr == AVR_PSEUDO_PC_REGNUM)
+ return gdbarch_tdep (gdbarch)->pc_type;
if (reg_nr == AVR_SP_REGNUM)
return builtin_type (gdbarch)->builtin_data_ptr;
- else
- return builtin_type_uint8;
+ return builtin_type (gdbarch)->builtin_uint8;
}
-/* Instruction address checks and convertions. */
+/* Instruction address checks and convertions. */
static CORE_ADDR
avr_make_iaddr (CORE_ADDR x)
return ((x) | AVR_IMEM_START);
}
-/* FIXME: TRoth: Really need to use a larger mask for instructions. Some
+/* FIXME: TRoth: Really need to use a larger mask for instructions. Some
devices are already up to 128KBytes of flash space.
- TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */
+ TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */
static CORE_ADDR
avr_convert_iaddr_to_raw (CORE_ADDR x)
return ((x) & 0xffffffff);
}
-/* SRAM address checks and convertions. */
+/* SRAM address checks and convertions. */
static CORE_ADDR
avr_make_saddr (CORE_ADDR x)
{
+ /* Return 0 for NULL. */
+ if (x == 0)
+ return 0;
+
return ((x) | AVR_SMEM_START);
}
return ((x) & 0xffffffff);
}
-/* EEPROM address checks and convertions. I don't know if these will ever
- actually be used, but I've added them just the same. TRoth */
+/* EEPROM address checks and convertions. I don't know if these will ever
+ actually be used, but I've added them just the same. TRoth */
/* TRoth/2002-04-08: Commented out for now to allow fix for problem with large
- programs in the mega128. */
+ programs in the mega128. */
/* static CORE_ADDR */
/* avr_make_eaddr (CORE_ADDR x) */
/* return ((x) & 0xffffffff); */
/* } */
-/* Convert from address to pointer and vice-versa. */
+/* Convert from address to pointer and vice-versa. */
static void
-avr_address_to_pointer (struct type *type, gdb_byte *buf, CORE_ADDR addr)
+avr_address_to_pointer (struct gdbarch *gdbarch,
+ struct type *type, gdb_byte *buf, CORE_ADDR addr)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ /* Is it a data address in flash? */
+ if (AVR_TYPE_ADDRESS_CLASS_FLASH (type))
+ {
+ /* A data pointer in flash is byte addressed. */
+ store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
+ avr_convert_iaddr_to_raw (addr));
+ }
/* Is it a code address? */
- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
- || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
+ else if (TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_FUNC
+ || TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_METHOD)
{
- store_unsigned_integer (buf, TYPE_LENGTH (type),
+ /* A code pointer is word (16 bits) addressed. We shift the address down
+ by 1 bit to convert it to a pointer. */
+ store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
avr_convert_iaddr_to_raw (addr >> 1));
}
else
{
/* Strip off any upper segment bits. */
- store_unsigned_integer (buf, TYPE_LENGTH (type),
+ store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
avr_convert_saddr_to_raw (addr));
}
}
static CORE_ADDR
-avr_pointer_to_address (struct type *type, const gdb_byte *buf)
+avr_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type, const gdb_byte *buf)
{
- CORE_ADDR addr = extract_unsigned_integer (buf, TYPE_LENGTH (type));
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR addr
+ = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order);
+ /* Is it a data address in flash? */
+ if (AVR_TYPE_ADDRESS_CLASS_FLASH (type))
+ {
+ /* A data pointer in flash is already byte addressed. */
+ return avr_make_iaddr (addr);
+ }
/* Is it a code address? */
- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
- || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD
- || TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type)))
- return avr_make_iaddr (addr << 1);
+ else if (TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_FUNC
+ || TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_METHOD
+ || TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type)))
+ {
+ /* A code pointer is word (16 bits) addressed so we shift it up
+ by 1 bit to convert it to an address. */
+ return avr_make_iaddr (addr << 1);
+ }
else
return avr_make_saddr (addr);
}
static CORE_ADDR
-avr_read_pc (struct regcache *regcache)
+avr_integer_to_address (struct gdbarch *gdbarch,
+ struct type *type, const gdb_byte *buf)
+{
+ ULONGEST addr = unpack_long (type, buf);
+
+ if (TYPE_DATA_SPACE (type))
+ return avr_make_saddr (addr);
+ else
+ return avr_make_iaddr (addr);
+}
+
+static CORE_ADDR
+avr_read_pc (readable_regcache *regcache)
{
ULONGEST pc;
- regcache_cooked_read_unsigned (regcache, AVR_PC_REGNUM, &pc);
+
+ regcache->cooked_read (AVR_PC_REGNUM, &pc);
return avr_make_iaddr (pc);
}
avr_convert_iaddr_to_raw (val));
}
+static enum register_status
+avr_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
+ int regnum, gdb_byte *buf)
+{
+ ULONGEST val;
+ enum register_status status;
+
+ switch (regnum)
+ {
+ case AVR_PSEUDO_PC_REGNUM:
+ status = regcache->raw_read (AVR_PC_REGNUM, &val);
+ if (status != REG_VALID)
+ return status;
+ val >>= 1;
+ store_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch), val);
+ return status;
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
+}
+
+static void
+avr_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const gdb_byte *buf)
+{
+ ULONGEST val;
+
+ switch (regnum)
+ {
+ case AVR_PSEUDO_PC_REGNUM:
+ val = extract_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch));
+ val <<= 1;
+ regcache_raw_write_unsigned (regcache, AVR_PC_REGNUM, val);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
+}
+
/* Function: avr_scan_prologue
This function decodes an AVR function prologue to determine:
This information is stored in the avr_unwind_cache structure.
Some devices lack the sbiw instruction, so on those replace this:
- sbiw r28, XX
+ sbiw r28, XX
with this:
- subi r28,lo8(XX)
- sbci r29,hi8(XX)
+ subi r28,lo8(XX)
+ sbci r29,hi8(XX)
A typical AVR function prologue with a frame pointer might look like this:
- push rXX ; saved regs
- ...
- push r28
- push r29
- in r28,__SP_L__
- in r29,__SP_H__
- sbiw r28,<LOCALS_SIZE>
- in __tmp_reg__,__SREG__
- cli
- out __SP_H__,r29
- out __SREG__,__tmp_reg__
- out __SP_L__,r28
+ push rXX ; saved regs
+ ...
+ push r28
+ push r29
+ in r28,__SP_L__
+ in r29,__SP_H__
+ sbiw r28,<LOCALS_SIZE>
+ in __tmp_reg__,__SREG__
+ cli
+ out __SP_H__,r29
+ out __SREG__,__tmp_reg__
+ out __SP_L__,r28
A typical AVR function prologue without a frame pointer might look like
this:
- push rXX ; saved regs
- ...
+ push rXX ; saved regs
+ ...
A main function prologue looks like this:
- ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
- ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
- out __SP_H__,r29
- out __SP_L__,r28
+ ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
+ ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
+ out __SP_H__,r29
+ out __SP_L__,r28
A signal handler prologue looks like this:
- push __zero_reg__
- push __tmp_reg__
- in __tmp_reg__, __SREG__
- push __tmp_reg__
- clr __zero_reg__
- push rXX ; save registers r18:r27, r30:r31
- ...
- push r28 ; save frame pointer
- push r29
- in r28, __SP_L__
- in r29, __SP_H__
- sbiw r28, <LOCALS_SIZE>
- out __SP_H__, r29
- out __SP_L__, r28
-
+ push __zero_reg__
+ push __tmp_reg__
+ in __tmp_reg__, __SREG__
+ push __tmp_reg__
+ clr __zero_reg__
+ push rXX ; save registers r18:r27, r30:r31
+ ...
+ push r28 ; save frame pointer
+ push r29
+ in r28, __SP_L__
+ in r29, __SP_H__
+ sbiw r28, <LOCALS_SIZE>
+ out __SP_H__, r29
+ out __SP_L__, r28
+
A interrupt handler prologue looks like this:
- sei
- push __zero_reg__
- push __tmp_reg__
- in __tmp_reg__, __SREG__
- push __tmp_reg__
- clr __zero_reg__
- push rXX ; save registers r18:r27, r30:r31
- ...
- push r28 ; save frame pointer
- push r29
- in r28, __SP_L__
- in r29, __SP_H__
- sbiw r28, <LOCALS_SIZE>
- cli
- out __SP_H__, r29
- sei
- out __SP_L__, r28
+ sei
+ push __zero_reg__
+ push __tmp_reg__
+ in __tmp_reg__, __SREG__
+ push __tmp_reg__
+ clr __zero_reg__
+ push rXX ; save registers r18:r27, r30:r31
+ ...
+ push r28 ; save frame pointer
+ push r29
+ in r28, __SP_L__
+ in r29, __SP_H__
+ sbiw r28, <LOCALS_SIZE>
+ cli
+ out __SP_H__, r29
+ sei
+ out __SP_L__, r28
A `-mcall-prologues' prologue looks like this (Note that the megas use a
jmp instead of a rjmp, thus the prologue is one word larger since jmp is a
32 bit insn and rjmp is a 16 bit insn):
- ldi r26,lo8(<LOCALS_SIZE>)
- ldi r27,hi8(<LOCALS_SIZE>)
- ldi r30,pm_lo8(.L_foo_body)
- ldi r31,pm_hi8(.L_foo_body)
- rjmp __prologue_saves__+RRR
- .L_foo_body: */
+ ldi r26,lo8(<LOCALS_SIZE>)
+ ldi r27,hi8(<LOCALS_SIZE>)
+ ldi r30,pm_lo8(.L_foo_body)
+ ldi r31,pm_hi8(.L_foo_body)
+ rjmp __prologue_saves__+RRR
+ .L_foo_body: */
/* Not really part of a prologue, but still need to scan for it, is when a
function prologue moves values passed via registers as arguments to new
- registers. In this case, all local variables live in registers, so there
- may be some register saves. This is what it looks like:
- movw rMM, rNN
- ...
+ registers. In this case, all local variables live in registers, so there
+ may be some register saves. This is what it looks like:
+ movw rMM, rNN
+ ...
- There could be multiple movw's. If the target doesn't have a movw insn, it
- will use two mov insns. This could be done after any of the above prologue
+ There could be multiple movw's. If the target doesn't have a movw insn, it
+ will use two mov insns. This could be done after any of the above prologue
types. */
static CORE_ADDR
-avr_scan_prologue (CORE_ADDR pc_beg, CORE_ADDR pc_end,
+avr_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR pc_beg, CORE_ADDR pc_end,
struct avr_unwind_cache *info)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int i;
unsigned short insn;
int scan_stage = 0;
- struct minimal_symbol *msymbol;
+ struct bound_minimal_symbol msymbol;
unsigned char prologue[AVR_MAX_PROLOGUE_SIZE];
int vpc = 0;
int len;
len = AVR_MAX_PROLOGUE_SIZE;
/* FIXME: TRoth/2003-06-11: This could be made more efficient by only
- reading in the bytes of the prologue. The problem is that the figuring
- out where the end of the prologue is is a bit difficult. The old code
+ reading in the bytes of the prologue. The problem is that the figuring
+ out where the end of the prologue is is a bit difficult. The old code
tried to do that, but failed quite often. */
read_memory (pc_beg, prologue, len);
0xcd, 0xbf /* out __SP_L__,r28 */
};
- insn = EXTRACT_INSN (&prologue[vpc]);
+ insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
/* ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) */
if ((insn & 0xf0f0) == 0xe0c0)
{
locals = (insn & 0xf) | ((insn & 0x0f00) >> 4);
- insn = EXTRACT_INSN (&prologue[vpc + 2]);
+ insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order);
/* ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) */
if ((insn & 0xf0f0) == 0xe0d0)
{
if (vpc + 4 + sizeof (img) < len
&& memcmp (prologue + vpc + 4, img, sizeof (img)) == 0)
{
- info->prologue_type = AVR_PROLOGUE_MAIN;
- info->base = locals;
- return pc_beg + 4;
+ info->prologue_type = AVR_PROLOGUE_MAIN;
+ info->base = locals;
+ return pc_beg + 4;
}
}
}
if (len < 10)
break;
- insn = EXTRACT_INSN (&prologue[vpc]);
+ insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
/* ldi r26,<LOCALS_SIZE> */
if ((insn & 0xf0f0) != 0xe0a0)
break;
loc_size = (insn & 0xf) | ((insn & 0x0f00) >> 4);
pc_offset += 2;
- insn = EXTRACT_INSN (&prologue[vpc + 2]);
+ insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order);
/* ldi r27,<LOCALS_SIZE> / 256 */
if ((insn & 0xf0f0) != 0xe0b0)
break;
loc_size |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
pc_offset += 2;
- insn = EXTRACT_INSN (&prologue[vpc + 4]);
+ insn = extract_unsigned_integer (&prologue[vpc + 4], 2, byte_order);
/* ldi r30,pm_lo8(.L_foo_body) */
if ((insn & 0xf0f0) != 0xe0e0)
break;
body_addr = (insn & 0xf) | ((insn & 0x0f00) >> 4);
pc_offset += 2;
- insn = EXTRACT_INSN (&prologue[vpc + 6]);
+ insn = extract_unsigned_integer (&prologue[vpc + 6], 2, byte_order);
/* ldi r31,pm_hi8(.L_foo_body) */
if ((insn & 0xf0f0) != 0xe0f0)
break;
pc_offset += 2;
msymbol = lookup_minimal_symbol ("__prologue_saves__", NULL, NULL);
- if (!msymbol)
+ if (!msymbol.minsym)
break;
- insn = EXTRACT_INSN (&prologue[vpc + 8]);
+ insn = extract_unsigned_integer (&prologue[vpc + 8], 2, byte_order);
/* rjmp __prologue_saves__+RRR */
if ((insn & 0xf000) == 0xc000)
- {
- /* Extract PC relative offset from RJMP */
- i = (insn & 0xfff) | (insn & 0x800 ? (-1 ^ 0xfff) : 0);
- /* Convert offset to byte addressable mode */
- i *= 2;
- /* Destination address */
- i += pc_beg + 10;
-
- if (body_addr != (pc_beg + 10)/2)
- break;
-
- pc_offset += 2;
- }
+ {
+ /* Extract PC relative offset from RJMP */
+ i = (insn & 0xfff) | (insn & 0x800 ? (-1 ^ 0xfff) : 0);
+ /* Convert offset to byte addressable mode */
+ i *= 2;
+ /* Destination address */
+ i += pc_beg + 10;
+
+ if (body_addr != (pc_beg + 10)/2)
+ break;
+
+ pc_offset += 2;
+ }
else if ((insn & 0xfe0e) == 0x940c)
- {
- /* Extract absolute PC address from JMP */
- i = (((insn & 0x1) | ((insn & 0x1f0) >> 3) << 16)
- | (EXTRACT_INSN (&prologue[vpc + 10]) & 0xffff));
- /* Convert address to byte addressable mode */
- i *= 2;
-
- if (body_addr != (pc_beg + 12)/2)
- break;
-
- pc_offset += 4;
- }
+ {
+ /* Extract absolute PC address from JMP */
+ i = (((insn & 0x1) | ((insn & 0x1f0) >> 3) << 16)
+ | (extract_unsigned_integer (&prologue[vpc + 10], 2, byte_order)
+ & 0xffff));
+ /* Convert address to byte addressable mode */
+ i *= 2;
+
+ if (body_addr != (pc_beg + 12)/2)
+ break;
+
+ pc_offset += 4;
+ }
else
- break;
+ break;
/* Resolve offset (in words) from __prologue_saves__ symbol.
- Which is a pushes count in `-mcall-prologues' mode */
- num_pushes = AVR_MAX_PUSHES - (i - SYMBOL_VALUE_ADDRESS (msymbol)) / 2;
+ Which is a pushes count in `-mcall-prologues' mode */
+ num_pushes = AVR_MAX_PUSHES - (i - BMSYMBOL_VALUE_ADDRESS (msymbol)) / 2;
if (num_pushes > AVR_MAX_PUSHES)
- {
- fprintf_unfiltered (gdb_stderr, _("Num pushes too large: %d\n"),
- num_pushes);
- num_pushes = 0;
- }
+ {
+ fprintf_unfiltered (gdb_stderr, _("Num pushes too large: %d\n"),
+ num_pushes);
+ num_pushes = 0;
+ }
if (num_pushes)
{
int from;
- info->saved_regs[AVR_FP_REGNUM + 1].addr = num_pushes;
+ info->saved_regs[AVR_FP_REGNUM + 1].set_addr (num_pushes);
if (num_pushes >= 2)
- info->saved_regs[AVR_FP_REGNUM].addr = num_pushes - 1;
+ info->saved_regs[AVR_FP_REGNUM].set_addr (num_pushes - 1);
i = 0;
for (from = AVR_LAST_PUSHED_REGNUM + 1 - (num_pushes - 2);
from <= AVR_LAST_PUSHED_REGNUM; ++from)
- info->saved_regs [from].addr = ++i;
+ info->saved_regs [from].set_addr (++i);
}
info->size = loc_size + num_pushes;
info->prologue_type = AVR_PROLOGUE_CALL;
if (len >= sizeof (img)
&& memcmp (prologue, img, sizeof (img)) == 0)
{
- info->prologue_type = AVR_PROLOGUE_INTR;
+ info->prologue_type = AVR_PROLOGUE_INTR;
vpc += sizeof (img);
- info->saved_regs[AVR_SREG_REGNUM].addr = 3;
- info->saved_regs[0].addr = 2;
- info->saved_regs[1].addr = 1;
- info->size += 3;
+ info->saved_regs[AVR_SREG_REGNUM].set_addr (3);
+ info->saved_regs[0].set_addr (2);
+ info->saved_regs[1].set_addr (1);
+ info->size += 3;
}
else if (len >= sizeof (img) - 2
&& memcmp (img + 2, prologue, sizeof (img) - 2) == 0)
{
- info->prologue_type = AVR_PROLOGUE_SIG;
- vpc += sizeof (img) - 2;
- info->saved_regs[AVR_SREG_REGNUM].addr = 3;
- info->saved_regs[0].addr = 2;
- info->saved_regs[1].addr = 1;
- info->size += 3;
+ info->prologue_type = AVR_PROLOGUE_SIG;
+ vpc += sizeof (img) - 2;
+ info->saved_regs[AVR_SREG_REGNUM].set_addr (3);
+ info->saved_regs[0].set_addr (2);
+ info->saved_regs[1].set_addr (1);
+ info->size += 2;
}
}
for (; vpc < len; vpc += 2)
{
- insn = EXTRACT_INSN (&prologue[vpc]);
+ insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
if ((insn & 0xfe0f) == 0x920f) /* push rXX */
{
- /* Bits 4-9 contain a mask for registers R0-R32. */
+ /* Bits 4-9 contain a mask for registers R0-R32. */
int regno = (insn & 0x1f0) >> 4;
info->size++;
- info->saved_regs[regno].addr = info->size;
+ info->saved_regs[regno].set_addr (info->size);
scan_stage = 1;
}
else
break;
}
- if (vpc >= AVR_MAX_PROLOGUE_SIZE)
- fprintf_unfiltered (gdb_stderr,
- _("Hit end of prologue while scanning pushes\n"));
+ gdb_assert (vpc < AVR_MAX_PROLOGUE_SIZE);
+
+ /* Handle static small stack allocation using rcall or push. */
+
+ while (scan_stage == 1 && vpc < len)
+ {
+ insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
+ if (insn == 0xd000) /* rcall .+0 */
+ {
+ info->size += gdbarch_tdep (gdbarch)->call_length;
+ vpc += 2;
+ }
+ else if (insn == 0x920f || insn == 0x921f) /* push r0 or push r1 */
+ {
+ info->size += 1;
+ vpc += 2;
+ }
+ else
+ break;
+ }
/* Second stage of the prologue scanning.
Scan:
0xcd, 0xb7, /* in r28,__SP_L__ */
0xde, 0xb7 /* in r29,__SP_H__ */
};
- unsigned short insn1;
if (vpc + sizeof (img) < len
&& memcmp (prologue + vpc, img, sizeof (img)) == 0)
}
}
- /* Third stage of the prologue scanning. (Really two stages)
+ /* Third stage of the prologue scanning. (Really two stages).
Scan for:
sbiw r28,XX or subi r28,lo8(XX)
- sbci r29,hi8(XX)
+ sbci r29,hi8(XX)
in __tmp_reg__,__SREG__
cli
out __SP_H__,r29
0xcd, 0xbf /* out 0x3d,r28 ; SPL */
};
- insn = EXTRACT_INSN (&prologue[vpc]);
- vpc += 2;
+ insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
if ((insn & 0xff30) == 0x9720) /* sbiw r28,XXX */
- locals_size = (insn & 0xf) | ((insn & 0xc0) >> 2);
+ {
+ locals_size = (insn & 0xf) | ((insn & 0xc0) >> 2);
+ vpc += 2;
+ }
else if ((insn & 0xf0f0) == 0x50c0) /* subi r28,lo8(XX) */
{
locals_size = (insn & 0xf) | ((insn & 0xf00) >> 4);
- insn = EXTRACT_INSN (&prologue[vpc]);
vpc += 2;
- locals_size += ((insn & 0xf) | ((insn & 0xf00) >> 4) << 8);
+ insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
+ vpc += 2;
+ locals_size += ((insn & 0xf) | ((insn & 0xf00) >> 4)) << 8;
}
else
return pc_beg + vpc;
- /* Scan the last part of the prologue. May not be present for interrupt
- or signal handler functions, which is why we set the prologue type
- when we saw the beginning of the prologue previously. */
+ /* Scan the last part of the prologue. May not be present for interrupt
+ or signal handler functions, which is why we set the prologue type
+ when we saw the beginning of the prologue previously. */
if (vpc + sizeof (img_sig) < len
&& memcmp (prologue + vpc, img_sig, sizeof (img_sig)) == 0)
- {
- vpc += sizeof (img_sig);
- }
+ {
+ vpc += sizeof (img_sig);
+ }
else if (vpc + sizeof (img_int) < len
&& memcmp (prologue + vpc, img_int, sizeof (img_int)) == 0)
- {
- vpc += sizeof (img_int);
- }
+ {
+ vpc += sizeof (img_int);
+ }
if (vpc + sizeof (img) < len
&& memcmp (prologue + vpc, img, sizeof (img)) == 0)
- {
- info->prologue_type = AVR_PROLOGUE_NORMAL;
- vpc += sizeof (img);
- }
+ {
+ info->prologue_type = AVR_PROLOGUE_NORMAL;
+ vpc += sizeof (img);
+ }
info->size += locals_size;
for (; vpc < len; vpc += 2)
{
- insn = EXTRACT_INSN (&prologue[vpc]);
+ insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
if ((insn & 0xff00) == 0x0100) /* movw rXX, rYY */
- continue;
+ continue;
else if ((insn & 0xfc00) == 0x2c00) /* mov rXX, rYY */
- continue;
+ continue;
else
- break;
+ break;
}
return pc_beg + vpc;
avr_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
CORE_ADDR func_addr, func_end;
- CORE_ADDR prologue_end = pc;
+ CORE_ADDR post_prologue_pc;
/* See what the symbol table says */
- if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
- {
- struct symtab_and_line sal;
- struct avr_unwind_cache info = {0};
- struct trad_frame_saved_reg saved_regs[AVR_NUM_REGS];
+ if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+ return pc;
- info.saved_regs = saved_regs;
+ post_prologue_pc = skip_prologue_using_sal (gdbarch, func_addr);
+ if (post_prologue_pc != 0)
+ return std::max (pc, post_prologue_pc);
- /* Need to run the prologue scanner to figure out if the function has a
- prologue and possibly skip over moving arguments passed via registers
- to other registers. */
+ {
+ CORE_ADDR prologue_end = pc;
+ struct avr_unwind_cache info = {0};
+ trad_frame_saved_reg saved_regs[AVR_NUM_REGS];
- prologue_end = avr_scan_prologue (func_addr, func_end, &info);
-
- if (info.prologue_type == AVR_PROLOGUE_NONE)
- return pc;
- else
- {
- sal = find_pc_line (func_addr, 0);
-
- if (sal.line != 0 && sal.end < func_end)
- return sal.end;
- }
- }
+ info.saved_regs = saved_regs;
+
+ /* Need to run the prologue scanner to figure out if the function has a
+ prologue and possibly skip over moving arguments passed via registers
+ to other registers. */
+
+ prologue_end = avr_scan_prologue (gdbarch, func_addr, func_end, &info);
+
+ if (info.prologue_type != AVR_PROLOGUE_NONE)
+ return prologue_end;
+ }
/* Either we didn't find the start of this function (nothing we can do),
or there's no line info, or the line after the prologue is after
- the end of the function (there probably isn't a prologue). */
+ the end of the function (there probably isn't a prologue). */
- return prologue_end;
+ return pc;
}
-/* Not all avr devices support the BREAK insn. Those that don't should treat
- it as a NOP. Thus, it should be ok. Since the avr is currently a remote
- only target, this shouldn't be a problem (I hope). TRoth/2003-05-14 */
-
-static const unsigned char *
-avr_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR * pcptr, int *lenptr)
-{
- static const unsigned char avr_break_insn [] = { 0x98, 0x95 };
- *lenptr = sizeof (avr_break_insn);
- return avr_break_insn;
-}
+/* Not all avr devices support the BREAK insn. Those that don't should treat
+ it as a NOP. Thus, it should be ok. Since the avr is currently a remote
+ only target, this shouldn't be a problem (I hope). TRoth/2003-05-14 */
-/* Given a return value in `regcache' with a type `type',
- extract and copy its value into `valbuf'.
+constexpr gdb_byte avr_break_insn [] = { 0x98, 0x95 };
- Return values are always passed via registers r25:r24:... */
-
-static void
-avr_extract_return_value (struct type *type, struct regcache *regcache,
- gdb_byte *valbuf)
-{
- ULONGEST r24, r25;
- ULONGEST c;
- int len;
- if (TYPE_LENGTH (type) == 1)
- {
- regcache_cooked_read_unsigned (regcache, 24, &c);
- store_unsigned_integer (valbuf, 1, c);
- }
- else
- {
- int i;
- /* The MSB of the return value is always in r25, calculate which
- register holds the LSB. */
- int lsb_reg = 25 - TYPE_LENGTH (type) + 1;
-
- for (i=0; i< TYPE_LENGTH (type); i++)
- {
- regcache_cooked_read (regcache, lsb_reg + i,
- (bfd_byte *) valbuf + i);
- }
- }
-}
+typedef BP_MANIPULATION (avr_break_insn) avr_breakpoint;
/* Determine, for architecture GDBARCH, how a return value of TYPE
should be returned. If it is supposed to be returned in registers,
from WRITEBUF into REGCACHE. */
static enum return_value_convention
-avr_return_value (struct gdbarch *gdbarch, struct type *func_type,
+avr_return_value (struct gdbarch *gdbarch, struct value *function,
struct type *valtype, struct regcache *regcache,
gdb_byte *readbuf, const gdb_byte *writebuf)
{
- int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
- || TYPE_CODE (valtype) == TYPE_CODE_UNION
- || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
- && !(TYPE_LENGTH (valtype) == 1
- || TYPE_LENGTH (valtype) == 2
- || TYPE_LENGTH (valtype) == 4
- || TYPE_LENGTH (valtype) == 8));
+ int i;
+ /* Single byte are returned in r24.
+ Otherwise, the MSB of the return value is always in r25, calculate which
+ register holds the LSB. */
+ int lsb_reg;
+
+ if ((valtype->code () == TYPE_CODE_STRUCT
+ || valtype->code () == TYPE_CODE_UNION
+ || valtype->code () == TYPE_CODE_ARRAY)
+ && TYPE_LENGTH (valtype) > 8)
+ return RETURN_VALUE_STRUCT_CONVENTION;
+
+ if (TYPE_LENGTH (valtype) <= 2)
+ lsb_reg = 24;
+ else if (TYPE_LENGTH (valtype) <= 4)
+ lsb_reg = 22;
+ else if (TYPE_LENGTH (valtype) <= 8)
+ lsb_reg = 18;
+ else
+ gdb_assert_not_reached ("unexpected type length");
if (writebuf != NULL)
{
- gdb_assert (!struct_return);
- error (_("Cannot store return value."));
+ for (i = 0; i < TYPE_LENGTH (valtype); i++)
+ regcache->cooked_write (lsb_reg + i, writebuf + i);
}
if (readbuf != NULL)
{
- gdb_assert (!struct_return);
- avr_extract_return_value (valtype, regcache, readbuf);
+ for (i = 0; i < TYPE_LENGTH (valtype); i++)
+ regcache->cooked_read (lsb_reg + i, readbuf + i);
}
- if (struct_return)
- return RETURN_VALUE_STRUCT_CONVENTION;
- else
- return RETURN_VALUE_REGISTER_CONVENTION;
+ return RETURN_VALUE_REGISTER_CONVENTION;
}
the saved registers of frame described by FRAME_INFO. This
includes special registers such as pc and fp saved in special ways
in the stack frame. sp is even more special: the address we return
- for it IS the sp for the next frame. */
+ for it IS the sp for the next frame. */
static struct avr_unwind_cache *
avr_frame_unwind_cache (struct frame_info *this_frame,
- void **this_prologue_cache)
+ void **this_prologue_cache)
{
CORE_ADDR start_pc, current_pc;
ULONGEST prev_sp;
int i;
if (*this_prologue_cache)
- return *this_prologue_cache;
+ return (struct avr_unwind_cache *) *this_prologue_cache;
info = FRAME_OBSTACK_ZALLOC (struct avr_unwind_cache);
*this_prologue_cache = info;
start_pc = get_frame_func (this_frame);
current_pc = get_frame_pc (this_frame);
if ((start_pc > 0) && (start_pc <= current_pc))
- avr_scan_prologue (start_pc, current_pc, info);
+ avr_scan_prologue (get_frame_arch (this_frame),
+ start_pc, current_pc, info);
if ((info->prologue_type != AVR_PROLOGUE_NONE)
&& (info->prologue_type != AVR_PROLOGUE_MAIN))
ULONGEST high_base; /* High byte of FP */
/* The SP was moved to the FP. This indicates that a new frame
- was created. Get THIS frame's FP value by unwinding it from
- the next frame. */
+ was created. Get THIS frame's FP value by unwinding it from
+ the next frame. */
this_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM);
high_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM + 1);
this_base += (high_base << 8);
/* The FP points at the last saved register. Adjust the FP back
- to before the first saved register giving the SP. */
+ to before the first saved register giving the SP. */
prev_sp = this_base + info->size;
}
else
{
/* Assume that the FP is this frame's SP but with that pushed
- stack space added back. */
+ stack space added back. */
this_base = get_frame_register_unsigned (this_frame, AVR_SP_REGNUM);
prev_sp = this_base + info->size;
}
/* Adjust all the saved registers so that they contain addresses and not
offsets. */
for (i = 0; i < gdbarch_num_regs (gdbarch) - 1; i++)
- if (info->saved_regs[i].addr > 0)
- info->saved_regs[i].addr = info->prev_sp - info->saved_regs[i].addr;
+ if (info->saved_regs[i].addr () > 0)
+ info->saved_regs[i].set_addr (info->prev_sp
+ - info->saved_regs[i].addr ());
/* Except for the main and startup code, the return PC is always saved on
- the stack and is at the base of the frame. */
+ the stack and is at the base of the frame. */
if (info->prologue_type != AVR_PROLOGUE_MAIN)
- info->saved_regs[AVR_PC_REGNUM].addr = info->prev_sp;
+ info->saved_regs[AVR_PC_REGNUM].set_addr (info->prev_sp);
/* The previous frame's SP needed to be computed. Save the computed
value. */
tdep = gdbarch_tdep (gdbarch);
trad_frame_set_value (info->saved_regs, AVR_SP_REGNUM,
- info->prev_sp - 1 + tdep->call_length);
+ info->prev_sp - 1 + tdep->call_length);
return info;
}
static void
avr_frame_this_id (struct frame_info *this_frame,
- void **this_prologue_cache,
- struct frame_id *this_id)
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
struct avr_unwind_cache *info
= avr_frame_unwind_cache (this_frame, this_prologue_cache);
struct avr_unwind_cache *info
= avr_frame_unwind_cache (this_frame, this_prologue_cache);
- if (regnum == AVR_PC_REGNUM)
+ if (regnum == AVR_PC_REGNUM || regnum == AVR_PSEUDO_PC_REGNUM)
{
- if (trad_frame_addr_p (info->saved_regs, regnum))
- {
+ if (trad_frame_addr_p (info->saved_regs, AVR_PC_REGNUM))
+ {
/* Reading the return PC from the PC register is slightly
abnormal. register_size(AVR_PC_REGNUM) says it is 4 bytes,
but in reality, only two bytes (3 in upcoming mega256) are
And to confuse matters even more, the return address stored
on the stack is in big endian byte order, even though most
- everything else about the avr is little endian. Ick! */
+ everything else about the avr is little endian. Ick! */
ULONGEST pc;
int i;
- unsigned char buf[3];
+ gdb_byte buf[3];
struct gdbarch *gdbarch = get_frame_arch (this_frame);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- read_memory (info->saved_regs[regnum].addr, buf, tdep->call_length);
+ read_memory (info->saved_regs[AVR_PC_REGNUM].addr (),
+ buf, tdep->call_length);
/* Extract the PC read from memory as a big-endian. */
pc = 0;
for (i = 0; i < tdep->call_length; i++)
pc = (pc << 8) | buf[i];
- return frame_unwind_got_constant (this_frame, regnum, pc << 1);
- }
+ if (regnum == AVR_PC_REGNUM)
+ pc <<= 1;
+
+ return frame_unwind_got_constant (this_frame, regnum, pc);
+ }
return frame_unwind_got_optimized (this_frame, regnum);
}
static const struct frame_unwind avr_frame_unwind = {
NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
avr_frame_this_id,
avr_frame_prev_register,
NULL,
}
/* When arguments must be pushed onto the stack, they go on in reverse
- order. The below implements a FILO (stack) to do this. */
+ order. The below implements a FILO (stack) to do this. */
struct stack_item
{
int len;
struct stack_item *prev;
- void *data;
+ gdb_byte *data;
};
static struct stack_item *
push_stack_item (struct stack_item *prev, const bfd_byte *contents, int len)
{
struct stack_item *si;
- si = xmalloc (sizeof (struct stack_item));
- si->data = xmalloc (len);
+ si = XNEW (struct stack_item);
+ si->data = (gdb_byte *) xmalloc (len);
si->len = len;
si->prev = prev;
memcpy (si->data, contents, len);
(depending on size) may go into these registers. The rest go on the stack.
All arguments are aligned to start in even-numbered registers (odd-sized
- arguments, including char, have one free register above them). For example,
+ arguments, including char, have one free register above them). For example,
an int in arg1 and a char in arg2 would be passed as such:
arg1 -> r25:r24
Arguments that are larger than 2 bytes will be split between two or more
registers as available, but will NOT be split between a register and the
- stack. Arguments that go onto the stack are pushed last arg first (this is
+ stack. Arguments that go onto the stack are pushed last arg first (this is
similar to the d10v). */
/* NOTE: TRoth/2003-06-17: The rest of this comment is old looks to be
must allocate space into which the callee will copy the return value. In
this case, a pointer to the return value location is passed into the callee
in register R0, which displaces one of the other arguments passed in via
- registers R0 to R2. */
+ registers R0 to R2. */
static CORE_ADDR
avr_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
- struct regcache *regcache, CORE_ADDR bp_addr,
- int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+ struct regcache *regcache, CORE_ADDR bp_addr,
+ int nargs, struct value **args, CORE_ADDR sp,
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
{
int i;
- unsigned char buf[2];
+ gdb_byte buf[3];
+ int call_length = gdbarch_tdep (gdbarch)->call_length;
CORE_ADDR return_pc = avr_convert_iaddr_to_raw (bp_addr);
int regnum = AVR_ARGN_REGNUM;
struct stack_item *si = NULL;
-#if 0
- /* FIXME: TRoth/2003-06-18: Not sure what to do when returning a struct. */
- if (struct_return)
+ if (return_method == return_method_struct)
{
- fprintf_unfiltered (gdb_stderr, "struct_return: 0x%lx\n", struct_addr);
- regcache_cooked_write_unsigned (regcache, argreg--, struct_addr & 0xff);
- regcache_cooked_write_unsigned (regcache, argreg--, (struct_addr >>8) & 0xff);
+ regcache_cooked_write_unsigned
+ (regcache, regnum--, (struct_addr >> 8) & 0xff);
+ regcache_cooked_write_unsigned
+ (regcache, regnum--, struct_addr & 0xff);
+ /* SP being post decremented, we need to reserve one byte so that the
+ return address won't overwrite the result (or vice-versa). */
+ if (sp == struct_addr)
+ sp--;
}
-#endif
for (i = 0; i < nargs; i++)
{
const bfd_byte *contents = value_contents (arg);
int len = TYPE_LENGTH (type);
- /* Calculate the potential last register needed. */
- last_regnum = regnum - (len + (len & 1));
-
- /* If there are registers available, use them. Once we start putting
- stuff on the stack, all subsequent args go on stack. */
- if ((si == NULL) && (last_regnum >= 8))
- {
- ULONGEST val;
-
- /* Skip a register for odd length args. */
- if (len & 1)
- regnum--;
-
- val = extract_unsigned_integer (contents, len);
- for (j=0; j<len; j++)
- {
- regcache_cooked_write_unsigned (regcache, regnum--,
- val >> (8*(len-j-1)));
- }
- }
- /* No registers available, push the args onto the stack. */
+ /* Calculate the potential last register needed.
+ E.g. For length 2, registers regnum and regnum-1 (say 25 and 24)
+ shall be used. So, last needed register will be regnum-1(24). */
+ last_regnum = regnum - (len + (len & 1)) + 1;
+
+ /* If there are registers available, use them. Once we start putting
+ stuff on the stack, all subsequent args go on stack. */
+ if ((si == NULL) && (last_regnum >= AVR_LAST_ARG_REGNUM))
+ {
+ /* Skip a register for odd length args. */
+ if (len & 1)
+ regnum--;
+
+ /* Write MSB of argument into register and subsequent bytes in
+ decreasing register numbers. */
+ for (j = 0; j < len; j++)
+ regcache_cooked_write_unsigned
+ (regcache, regnum--, contents[len - j - 1]);
+ }
+ /* No registers available, push the args onto the stack. */
else
- {
- /* From here on, we don't care about regnum. */
- si = push_stack_item (si, contents, len);
- }
+ {
+ /* From here on, we don't care about regnum. */
+ si = push_stack_item (si, contents, len);
+ }
}
- /* Push args onto the stack. */
+ /* Push args onto the stack. */
while (si)
{
sp -= si->len;
- /* Add 1 to sp here to account for post decr nature of pushes. */
+ /* Add 1 to sp here to account for post decr nature of pushes. */
write_memory (sp + 1, si->data, si->len);
si = pop_stack_item (si);
}
/* Set the return address. For the avr, the return address is the BP_ADDR.
Need to push the return address onto the stack noting that it needs to be
in big-endian order on the stack. */
- buf[0] = (return_pc >> 8) & 0xff;
- buf[1] = return_pc & 0xff;
+ for (i = 1; i <= call_length; i++)
+ {
+ buf[call_length - i] = return_pc & 0xff;
+ return_pc >>= 8;
+ }
- sp -= 2;
- write_memory (sp + 1, buf, 2); /* Add one since pushes are post decr ops. */
+ sp -= call_length;
+ /* Use 'sp + 1' since pushes are post decr ops. */
+ write_memory (sp + 1, buf, call_length);
- /* Finally, update the SP register. */
+ /* Finally, update the SP register. */
regcache_cooked_write_unsigned (regcache, AVR_SP_REGNUM,
avr_convert_saddr_to_raw (sp));
- return sp;
+ /* Return SP value for the dummy frame, where the return address hasn't been
+ pushed. */
+ return sp + call_length;
}
-/* Initialize the gdbarch structure for the AVR's. */
+/* Unfortunately dwarf2 register for SP is 32. */
+
+static int
+avr_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
+{
+ if (reg >= 0 && reg < 32)
+ return reg;
+ if (reg == 32)
+ return AVR_SP_REGNUM;
+ return -1;
+}
+
+/* Implementation of `address_class_type_flags' gdbarch method.
+
+ This method maps DW_AT_address_class attributes to a
+ type_instance_flag_value. */
+
+static type_instance_flags
+avr_address_class_type_flags (int byte_size, int dwarf2_addr_class)
+{
+ /* The value 1 of the DW_AT_address_class attribute corresponds to the
+ __flash qualifier. Note that this attribute is only valid with
+ pointer types and therefore the flag is set to the pointer type and
+ not its target type. */
+ if (dwarf2_addr_class == 1 && byte_size == 2)
+ return AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH;
+ return 0;
+}
+
+/* Implementation of `address_class_type_flags_to_name' gdbarch method.
+
+ Convert a type_instance_flag_value to an address space qualifier. */
+
+static const char*
+avr_address_class_type_flags_to_name (struct gdbarch *gdbarch,
+ type_instance_flags type_flags)
+{
+ if (type_flags & AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH)
+ return "flash";
+ else
+ return NULL;
+}
+
+/* Implementation of `address_class_name_to_type_flags' gdbarch method.
+
+ Convert an address space qualifier to a type_instance_flag_value. */
+
+static bool
+avr_address_class_name_to_type_flags (struct gdbarch *gdbarch,
+ const char* name,
+ type_instance_flags *type_flags_ptr)
+{
+ if (strcmp (name, "flash") == 0)
+ {
+ *type_flags_ptr = AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH;
+ return true;
+ }
+ else
+ return false;
+}
+
+/* Initialize the gdbarch structure for the AVR's. */
static struct gdbarch *
avr_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
switch (info.bfd_arch_info->mach)
{
case bfd_mach_avr1:
+ case bfd_mach_avrxmega1:
case bfd_mach_avr2:
+ case bfd_mach_avrxmega2:
case bfd_mach_avr3:
+ case bfd_mach_avrxmega3:
case bfd_mach_avr4:
+ case bfd_mach_avrxmega4:
case bfd_mach_avr5:
+ case bfd_mach_avrxmega5:
default:
call_length = 2;
break;
case bfd_mach_avr6:
+ case bfd_mach_avrxmega6:
+ case bfd_mach_avrxmega7:
call_length = 3;
break;
}
return best_arch->gdbarch;
}
- /* None found, create a new architecture from the information provided. */
- tdep = XMALLOC (struct gdbarch_tdep);
+ /* None found, create a new architecture from the information provided. */
+ tdep = XCNEW (struct gdbarch_tdep);
gdbarch = gdbarch_alloc (&info, tdep);
tdep->call_length = call_length;
+ /* Create a type for PC. We can't use builtin types here, as they may not
+ be defined. */
+ tdep->void_type = arch_type (gdbarch, TYPE_CODE_VOID, TARGET_CHAR_BIT,
+ "void");
+ tdep->func_void_type = make_function_type (tdep->void_type, NULL);
+ tdep->pc_type = arch_pointer_type (gdbarch, 4 * TARGET_CHAR_BIT, NULL,
+ tdep->func_void_type);
+
set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT);
set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT);
set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT);
set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT);
set_gdbarch_addr_bit (gdbarch, 32);
+ set_gdbarch_wchar_bit (gdbarch, 2 * TARGET_CHAR_BIT);
+ set_gdbarch_wchar_signed (gdbarch, 1);
+
set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT);
set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
set_gdbarch_register_name (gdbarch, avr_register_name);
set_gdbarch_register_type (gdbarch, avr_register_type);
+ set_gdbarch_num_pseudo_regs (gdbarch, AVR_NUM_PSEUDO_REGS);
+ set_gdbarch_pseudo_register_read (gdbarch, avr_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, avr_pseudo_register_write);
+
set_gdbarch_return_value (gdbarch, avr_return_value);
- set_gdbarch_print_insn (gdbarch, print_insn_avr);
set_gdbarch_push_dummy_call (gdbarch, avr_push_dummy_call);
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, avr_dwarf_reg_to_regnum);
+
set_gdbarch_address_to_pointer (gdbarch, avr_address_to_pointer);
set_gdbarch_pointer_to_address (gdbarch, avr_pointer_to_address);
+ set_gdbarch_integer_to_address (gdbarch, avr_integer_to_address);
set_gdbarch_skip_prologue (gdbarch, avr_skip_prologue);
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- set_gdbarch_breakpoint_from_pc (gdbarch, avr_breakpoint_from_pc);
+ set_gdbarch_breakpoint_kind_from_pc (gdbarch, avr_breakpoint::kind_from_pc);
+ set_gdbarch_sw_breakpoint_from_kind (gdbarch, avr_breakpoint::bp_from_kind);
frame_unwind_append_unwinder (gdbarch, &avr_frame_unwind);
frame_base_set_default (gdbarch, &avr_frame_base);
set_gdbarch_unwind_pc (gdbarch, avr_unwind_pc);
set_gdbarch_unwind_sp (gdbarch, avr_unwind_sp);
+ set_gdbarch_address_class_type_flags (gdbarch, avr_address_class_type_flags);
+ set_gdbarch_address_class_name_to_type_flags
+ (gdbarch, avr_address_class_name_to_type_flags);
+ set_gdbarch_address_class_type_flags_to_name
+ (gdbarch, avr_address_class_type_flags_to_name);
+
return gdbarch;
}
/* Send a query request to the avr remote target asking for values of the io
- registers. If args parameter is not NULL, then the user has requested info
+ registers. If args parameter is not NULL, then the user has requested info
on a specific io register [This still needs implemented and is ignored for
- now]. The query string should be one of these forms:
+ now]. The query string should be one of these forms:
"Ravr.io_reg" -> reply is "NN" number of io registers
"Ravr.io_reg:addr,len" where addr is first register and len is number of
- registers to be read. The reply should be "<NAME>,VV;" for each io register
+ registers to be read. The reply should be "<NAME>,VV;" for each io register
where, <NAME> is a string, and VV is the hex value of the register.
- All io registers are 8-bit. */
+ All io registers are 8-bit. */
static void
-avr_io_reg_read_command (char *args, int from_tty)
+avr_io_reg_read_command (const char *args, int from_tty)
{
- LONGEST bufsiz = 0;
- gdb_byte *buf;
char query[400];
- char *p;
unsigned int nreg = 0;
unsigned int val;
- int i, j, k, step;
- /* Find out how many io registers the target has. */
- bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR,
- "avr.io_reg", &buf);
+ /* Find out how many io registers the target has. */
+ gdb::optional<gdb::byte_vector> buf
+ = target_read_alloc (current_top_target (), TARGET_OBJECT_AVR, "avr.io_reg");
- if (bufsiz <= 0)
+ if (!buf)
{
fprintf_unfiltered (gdb_stderr,
_("ERR: info io_registers NOT supported "
return;
}
- if (sscanf (buf, "%x", &nreg) != 1)
+ const char *bufstr = (const char *) buf->data ();
+
+ if (sscanf (bufstr, "%x", &nreg) != 1)
{
fprintf_unfiltered (gdb_stderr,
_("Error fetching number of io registers\n"));
- xfree (buf);
return;
}
- xfree (buf);
-
reinitialize_more_filter ();
printf_unfiltered (_("Target has %u io registers:\n\n"), nreg);
/* only fetch up to 8 registers at a time to keep the buffer small */
- step = 8;
+ int step = 8;
- for (i = 0; i < nreg; i += step)
+ for (int i = 0; i < nreg; i += step)
{
/* how many registers this round? */
- j = step;
+ int j = step;
if ((i+j) >= nreg)
- j = nreg - i; /* last block is less than 8 registers */
+ j = nreg - i; /* last block is less than 8 registers */
snprintf (query, sizeof (query) - 1, "avr.io_reg:%x,%x", i, j);
- bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR,
- query, &buf);
+ buf = target_read_alloc (current_top_target (), TARGET_OBJECT_AVR, query);
- p = buf;
- for (k = i; k < (i + j); k++)
+ if (!buf)
+ {
+ fprintf_unfiltered (gdb_stderr,
+ _("ERR: error reading avr.io_reg:%x,%x\n"),
+ i, j);
+ return;
+ }
+
+ const char *p = (const char *) buf->data ();
+ for (int k = i; k < (i + j); k++)
{
if (sscanf (p, "%[^,],%x;", query, &val) == 2)
{
break;
}
}
-
- xfree (buf);
}
}
-extern initialize_file_ftype _initialize_avr_tdep; /* -Wmissing-prototypes */
-
+void _initialize_avr_tdep ();
void
-_initialize_avr_tdep (void)
+_initialize_avr_tdep ()
{
register_gdbarch_init (bfd_arch_avr, avr_gdbarch_init);
/* Add a new command to allow the user to query the avr remote target for
the values of the io space registers in a saner way than just using
- `x/NNNb ADDR`. */
+ `x/NNNb ADDR`. */
/* FIXME: TRoth/2002-02-18: This should probably be changed to 'info avr
- io_registers' to signify it is not available on other platforms. */
+ io_registers' to signify it is not available on other platforms. */
- add_cmd ("io_registers", class_info, avr_io_reg_read_command,
- _("query remote avr target for io space register values"),
- &infolist);
+ add_info ("io_registers", avr_io_reg_read_command,
+ _("Query remote AVR target for I/O space register values."));
}
projects / thirdparty / binutils-gdb.git / blobdiff