avr_write_pc (struct regcache *regcache, CORE_ADDR val)
{
regcache_cooked_write_unsigned (regcache, AVR_PC_REGNUM,
- avr_convert_iaddr_to_raw (val));
+ 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)
+ int regnum, gdb_byte *buf)
{
ULONGEST val;
enum register_status status;
static void
avr_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, const gdb_byte *buf)
+ int regnum, const gdb_byte *buf)
{
ULONGEST val;
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
- ...
+ 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
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;
}
}
}
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 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;
+ /* Convert address to byte addressable mode */
+ i *= 2;
- if (body_addr != (pc_beg + 12)/2)
- break;
+ if (body_addr != (pc_beg + 12)/2)
+ break;
- pc_offset += 4;
- }
+ pc_offset += 4;
+ }
else
- break;
+ break;
/* Resolve offset (in words) from __prologue_saves__ symbol.
- Which is a pushes count in `-mcall-prologues' mode */
+ 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)
{
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].addr = 3;
+ info->saved_regs[0].addr = 2;
+ info->saved_regs[1].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 += 2;
+ 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 += 2;
}
}
{
insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
if (insn == 0xd000) /* rcall .+0 */
- {
- info->size += gdbarch_tdep (gdbarch)->call_length;
- vpc += 2;
- }
+ {
+ 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;
- }
+ {
+ info->size += 1;
+ vpc += 2;
+ }
else
- break;
+ break;
}
/* Second stage of the prologue scanning.
/* 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
insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
if ((insn & 0xff30) == 0x9720) /* sbiw r28,XXX */
- {
- locals_size = (insn & 0xf) | ((insn & 0xc0) >> 2);
- vpc += 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);
locals_size += ((insn & 0xf) | ((insn & 0xf00) >> 4)) << 8;
}
else
- return pc_beg + vpc;
+ 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. */
+ 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;
{
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;
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;
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;
}
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);
if (regnum == AVR_PC_REGNUM || regnum == AVR_PSEUDO_PC_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
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
read_memory (info->saved_regs[AVR_PC_REGNUM].addr,
- buf, tdep->call_length);
+ 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];
- if (regnum == AVR_PC_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 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,
+ 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)
{
if (return_method == return_method_struct)
{
regcache_cooked_write_unsigned
- (regcache, regnum--, (struct_addr >> 8) & 0xff);
+ (regcache, regnum--, (struct_addr >> 8) & 0xff);
regcache_cooked_write_unsigned
- (regcache, regnum--, struct_addr & 0xff);
+ (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). */
+ return address won't overwrite the result (or vice-versa). */
if (sp == struct_addr)
- sp--;
+ sp--;
}
for (i = 0; i < nargs; i++)
int len = TYPE_LENGTH (type);
/* 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). */
+ 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. */
+ 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]);
- }
+ {
+ /* 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. */
/* how many registers this round? */
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);
buf = target_read_alloc (current_top_target (), TARGET_OBJECT_AVR, query);
if (!buf)
- {
- fprintf_unfiltered (gdb_stderr,
+ {
+ fprintf_unfiltered (gdb_stderr,
_("ERR: error reading avr.io_reg:%x,%x\n"),
i, j);
- return;
- }
+ return;
+ }
const char *p = (const char *) buf->data ();
for (int k = i; k < (i + j); k++)
projects / binutils.git / blobdiff