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re PR target/49868 (Implement named address space to place/access data in flash memory) 

PR target/49868
	Rename __pgm to __flash.
	Rename __pgm1 to __flash1.
	Rename __pgm2 to __flash2.
	Rename __pgm3 to __flash3.
	Rename __pgm4 to __flash4.
	Rename __pgm5 to __flash5.
	Rename __pgmx to __memx.
	* doc/extend.texi (AVR Named Address Spaces)
	Rename address space names as indicated above.
	* config/avr/avr.c (avr_addrspace): Ditto.
	* config/avr/avr-protos.h
	(avr_mem_pgmx_p): Rename to avr_mem_memx_p.
	(avr_mem_pgm_p): Rename to avr_mem_flash_p.
	* config/avr/predicates.md: Ditto.
	* config/avr/avr.c Ditto, and
	(avr_decl_pgmx_p): Rename to avr_decl_memx_p.
	(avr_decl_pgm_p): Rename to avr_decl_flash_p.
	* config/avr/avr.h (ADDR_SPACE_PGM): Rename to ADDR_SPACE_FLASH.
	(ADDR_SPACE_PGM1): Rename to ADDR_SPACE_FLASH1.
	(ADDR_SPACE_PGM2): Rename to ADDR_SPACE_FLASH2.
	(ADDR_SPACE_PGM3): Rename to ADDR_SPACE_FLASH3.
	(ADDR_SPACE_PGM4): Rename to ADDR_SPACE_FLASH4.
	(ADDR_SPACE_PGM5): Rename to ADDR_SPACE_FLASH5.
	(ADDR_SPACE_PGMX): Rename to ADDR_SPACE_MEMX.
	* config/avr/avr.c: Ditto.
	* config/avr/avr.md: Ditto.

From-SVN: r183529
This commit is contained in:
Georg-Johann Lay 2012-01-25 18:17:07 +00:00 committed by Georg-Johann Lay
parent f5a5c89082
commit 3a840863c2
7 changed files with 135 additions and 103 deletions
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32
gcc/ChangeLog
View File

@ -1,3 +1,35 @@
2012-01-25 Georg-Johann Lay <avr@gjlay.de>
PR target/49868
Rename __pgm to __flash.
Rename __pgm1 to __flash1.
Rename __pgm2 to __flash2.
Rename __pgm3 to __flash3.
Rename __pgm4 to __flash4.
Rename __pgm5 to __flash5.
Rename __pgmx to __memx.
* doc/extend.texi (AVR Named Address Spaces)
Rename address space names as indicated above.
* config/avr/avr.c (avr_addrspace): Ditto.
* config/avr/avr-protos.h
(avr_mem_pgmx_p): Rename to avr_mem_memx_p.
(avr_mem_pgm_p): Rename to avr_mem_flash_p.
* config/avr/predicates.md: Ditto.
* config/avr/avr.c Ditto, and
(avr_decl_pgmx_p): Rename to avr_decl_memx_p.
(avr_decl_pgm_p): Rename to avr_decl_flash_p.
* config/avr/avr.h (ADDR_SPACE_PGM): Rename to ADDR_SPACE_FLASH.
(ADDR_SPACE_PGM1): Rename to ADDR_SPACE_FLASH1.
(ADDR_SPACE_PGM2): Rename to ADDR_SPACE_FLASH2.
(ADDR_SPACE_PGM3): Rename to ADDR_SPACE_FLASH3.
(ADDR_SPACE_PGM4): Rename to ADDR_SPACE_FLASH4.
(ADDR_SPACE_PGM5): Rename to ADDR_SPACE_FLASH5.
(ADDR_SPACE_PGMX): Rename to ADDR_SPACE_MEMX.
* config/avr/avr.c: Ditto.
* config/avr/avr.md: Ditto.
2012-01-25 Jason Merrill <jason@redhat.com>
PR c++/51992

4
gcc/config/avr/avr-protos.h
View File

@ -120,8 +120,8 @@ extern reg_class_t avr_mode_code_base_reg_class (enum machine_mode, addr_space_t
extern bool avr_regno_mode_code_ok_for_base_p (int, enum machine_mode, addr_space_t, RTX_CODE, RTX_CODE);
extern rtx avr_incoming_return_addr_rtx (void);
extern rtx avr_legitimize_reload_address (rtx*, enum machine_mode, int, int, int, int, rtx (*)(rtx,int));
extern bool avr_mem_pgm_p (rtx);
extern bool avr_mem_pgmx_p (rtx);
extern bool avr_mem_flash_p (rtx);
extern bool avr_mem_memx_p (rtx);
extern bool avr_load_libgcc_p (rtx);
extern bool avr_xload_libgcc_p (enum machine_mode);
#endif /* RTX_CODE */

110
gcc/config/avr/avr.c
View File

@ -83,13 +83,13 @@
const avr_addrspace_t avr_addrspace[] =
{
{ ADDR_SPACE_RAM, 0, 2, "" , 0 },
{ ADDR_SPACE_PGM, 1, 2, "__pgm", 0 },
{ ADDR_SPACE_PGM1, 1, 2, "__pgm1", 1 },
{ ADDR_SPACE_PGM2, 1, 2, "__pgm2", 2 },
{ ADDR_SPACE_PGM3, 1, 2, "__pgm3", 3 },
{ ADDR_SPACE_PGM4, 1, 2, "__pgm4", 4 },
{ ADDR_SPACE_PGM5, 1, 2, "__pgm5", 5 },
{ ADDR_SPACE_PGMX, 1, 3, "__pgmx", 0 },
{ ADDR_SPACE_FLASH, 1, 2, "__flash", 0 },
{ ADDR_SPACE_FLASH1, 1, 2, "__flash1", 1 },
{ ADDR_SPACE_FLASH2, 1, 2, "__flash2", 2 },
{ ADDR_SPACE_FLASH3, 1, 2, "__flash3", 3 },
{ ADDR_SPACE_FLASH4, 1, 2, "__flash4", 4 },
{ ADDR_SPACE_FLASH5, 1, 2, "__flash5", 5 },
{ ADDR_SPACE_MEMX, 1, 3, "__memx", 0 },
{ 0 , 0, 0, NULL, 0 }
};
@ -177,7 +177,7 @@ const struct mcu_type_s *avr_current_device;
static GTY(()) section *progmem_swtable_section;
/* Unnamed sections associated to __attribute__((progmem)) aka. PROGMEM
or to address space __pgm*. */
or to address space __flash*. */
static GTY(()) section *progmem_section[6];
/* Condition for insns/expanders from avr-dimode.md. */
@ -485,7 +485,7 @@ avr_scalar_mode_supported_p (enum machine_mode mode)
/* Return TRUE if DECL is a VAR_DECL located in Flash and FALSE, otherwise. */
static bool
avr_decl_pgm_p (tree decl)
avr_decl_flash_p (tree decl)
{
if (TREE_CODE (decl) != VAR_DECL
|| TREE_TYPE (decl) == error_mark_node)
@ -501,7 +501,7 @@ avr_decl_pgm_p (tree decl)
address space and FALSE, otherwise. */
static bool
avr_decl_pgmx_p (tree decl)
avr_decl_memx_p (tree decl)
{
if (TREE_CODE (decl) != VAR_DECL
|| TREE_TYPE (decl) == error_mark_node)
@ -509,14 +509,14 @@ avr_decl_pgmx_p (tree decl)
return false;
}
return (ADDR_SPACE_PGMX == TYPE_ADDR_SPACE (TREE_TYPE (decl)));
return (ADDR_SPACE_MEMX == TYPE_ADDR_SPACE (TREE_TYPE (decl)));
}
/* Return TRUE if X is a MEM rtx located in Flash and FALSE, otherwise. */
bool
avr_mem_pgm_p (rtx x)
avr_mem_flash_p (rtx x)
{
return (MEM_P (x)
&& !ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (x)));
@ -527,10 +527,10 @@ avr_mem_pgm_p (rtx x)
address space and FALSE, otherwise. */
bool
avr_mem_pgmx_p (rtx x)
avr_mem_memx_p (rtx x)
{
return (MEM_P (x)
&& ADDR_SPACE_PGMX == MEM_ADDR_SPACE (x));
&& ADDR_SPACE_MEMX == MEM_ADDR_SPACE (x));
}
@ -2432,7 +2432,7 @@ avr_load_libgcc_p (rtx op)
return (n_bytes > 2
&& !AVR_HAVE_LPMX
&& avr_mem_pgm_p (op));
&& avr_mem_flash_p (op));
}
/* Return true if a value of mode MODE is read by __xload_* function. */
@ -2802,8 +2802,8 @@ output_movqi (rtx insn, rtx operands[], int *l)
rtx src = operands[1];
int *real_l = l;
if (avr_mem_pgm_p (src)
|| avr_mem_pgm_p (dest))
if (avr_mem_flash_p (src)
|| avr_mem_flash_p (dest))
{
return avr_out_lpm (insn, operands, real_l);
}
@ -2853,8 +2853,8 @@ output_movhi (rtx insn, rtx xop[], int *plen)
gcc_assert (GET_MODE_SIZE (GET_MODE (dest)) == 2);
if (avr_mem_pgm_p (src)
|| avr_mem_pgm_p (dest))
if (avr_mem_flash_p (src)
|| avr_mem_flash_p (dest))
{
return avr_out_lpm (insn, xop, plen);
}
@ -3424,8 +3424,8 @@ output_movsisf (rtx insn, rtx operands[], int *l)
rtx src = operands[1];
int *real_l = l;
if (avr_mem_pgm_p (src)
|| avr_mem_pgm_p (dest))
if (avr_mem_flash_p (src)
|| avr_mem_flash_p (dest))
{
return avr_out_lpm (insn, operands, real_l);
}
@ -3725,8 +3725,8 @@ avr_out_movpsi (rtx insn, rtx *op, int *plen)
rtx dest = op[0];
rtx src = op[1];
if (avr_mem_pgm_p (src)
|| avr_mem_pgm_p (dest))
if (avr_mem_flash_p (src)
|| avr_mem_flash_p (dest))
{
return avr_out_lpm (insn, op, plen);
}
@ -6810,10 +6810,10 @@ avr_progmem_p (tree decl, tree attributes)
if (TREE_CODE (decl) != VAR_DECL)
return 0;
if (avr_decl_pgmx_p (decl))
if (avr_decl_memx_p (decl))
return 2;
if (avr_decl_pgm_p (decl))
if (avr_decl_flash_p (decl))
return 1;
if (NULL_TREE
@ -6878,8 +6878,8 @@ avr_nonconst_pointer_addrspace (tree typ)
}
/* Sanity check NODE so that all pointers targeting address space AS1
go along with CONST qualifier. Writing to this address space should
/* Sanity check NODE so that all pointers targeting non-generic addres spaces
go along with CONST qualifier. Writing to these address spaces should
be detected and complained about as early as possible. */
static bool
@ -7195,11 +7195,11 @@ avr_section_type_flags (tree decl, const char *name, int reloc)
addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
/* Attribute progmem puts data in generic address space.
Set section flags as if it was in __pgm to get the right
Set section flags as if it was in __flash to get the right
section prefix in the remainder. */
if (ADDR_SPACE_GENERIC_P (as))
as = ADDR_SPACE_PGM;
as = ADDR_SPACE_FLASH;
flags |= as * SECTION_MACH_DEP;
flags &= ~SECTION_WRITE;
@ -7244,7 +7244,7 @@ avr_encode_section_info (tree decl, rtx rtl, int new_decl_p)
patch address space. */
if (-1 == avr_progmem_p (decl, DECL_ATTRIBUTES (decl)))
as = ADDR_SPACE_PGM;
as = ADDR_SPACE_FLASH;
AVR_SYMBOL_SET_ADDR_SPACE (sym, as);
}
@ -9469,12 +9469,12 @@ avr_addr_space_legitimate_address_p (enum machine_mode mode, rtx x,
case ADDR_SPACE_GENERIC:
return avr_legitimate_address_p (mode, x, strict);
case ADDR_SPACE_PGM:
case ADDR_SPACE_PGM1:
case ADDR_SPACE_PGM2:
case ADDR_SPACE_PGM3:
case ADDR_SPACE_PGM4:
case ADDR_SPACE_PGM5:
case ADDR_SPACE_FLASH:
case ADDR_SPACE_FLASH1:
case ADDR_SPACE_FLASH2:
case ADDR_SPACE_FLASH3:
case ADDR_SPACE_FLASH4:
case ADDR_SPACE_FLASH5:
switch (GET_CODE (x))
{
@ -9490,9 +9490,9 @@ avr_addr_space_legitimate_address_p (enum machine_mode mode, rtx x,
break;
}
break; /* PGM */
break; /* FLASH */
case ADDR_SPACE_PGMX:
case ADDR_SPACE_MEMX:
if (REG_P (x))
ok = (!strict
&& can_create_pseudo_p());
@ -9508,7 +9508,7 @@ avr_addr_space_legitimate_address_p (enum machine_mode mode, rtx x,
&& REGNO (lo) == REG_Z);
}
break; /* PGMX */
break; /* MEMX */
}
if (avr_log.legitimate_address_p)
@ -9567,8 +9567,8 @@ avr_addr_space_convert (rtx src, tree type_from, tree type_to)
/* Up-casting from 16-bit to 24-bit pointer. */
if (as_from != ADDR_SPACE_PGMX
&& as_to == ADDR_SPACE_PGMX)
if (as_from != ADDR_SPACE_MEMX
&& as_to == ADDR_SPACE_MEMX)
{
int msb;
rtx sym = src;
@ -9584,9 +9584,9 @@ avr_addr_space_convert (rtx src, tree type_from, tree type_to)
address space. */
if (SYMBOL_REF == GET_CODE (sym)
&& ADDR_SPACE_PGM == AVR_SYMBOL_GET_ADDR_SPACE (sym))
&& ADDR_SPACE_FLASH == AVR_SYMBOL_GET_ADDR_SPACE (sym))
{
as_from = ADDR_SPACE_PGM;
as_from = ADDR_SPACE_FLASH;
}
/* Linearize memory: RAM has bit 23 set. */
@ -9606,8 +9606,8 @@ avr_addr_space_convert (rtx src, tree type_from, tree type_to)
/* Down-casting from 24-bit to 16-bit throws away the high byte. */
if (as_from == ADDR_SPACE_PGMX
&& as_to != ADDR_SPACE_PGMX)
if (as_from == ADDR_SPACE_MEMX
&& as_to != ADDR_SPACE_MEMX)
{
rtx new_src = gen_reg_rtx (Pmode);
@ -9651,7 +9651,7 @@ avr_emit_movmemhi (rtx *xop)
rtx loop_reg, addr0, addr1, a_src, a_dest, insn, xas, reg_x;
rtx a_hi8 = NULL_RTX;
if (avr_mem_pgm_p (xop[0]))
if (avr_mem_flash_p (xop[0]))
return false;
if (!CONST_INT_P (xop[2]))
@ -9666,7 +9666,7 @@ avr_emit_movmemhi (rtx *xop)
if (PSImode == GET_MODE (a_src))
{
gcc_assert (as == ADDR_SPACE_PGMX);
gcc_assert (as == ADDR_SPACE_MEMX);
loop_mode = (count < 0x100) ? QImode : HImode;
loop_reg = gen_rtx_REG (loop_mode, 24);
@ -9687,7 +9687,7 @@ avr_emit_movmemhi (rtx *xop)
}
else if (!ADDR_SPACE_GENERIC_P (as))
{
as = ADDR_SPACE_PGM;
as = ADDR_SPACE_FLASH;
}
addr1 = a_src;
@ -9718,7 +9718,7 @@ avr_emit_movmemhi (rtx *xop)
gcc_assert (TMP_REGNO == LPM_REGNO);
if (as != ADDR_SPACE_PGMX)
if (as != ADDR_SPACE_MEMX)
{
/* Load instruction ([E]LPM or LD) is known at compile time:
Do the copy-loop inline. */
@ -9792,7 +9792,7 @@ avr_out_movmem (rtx insn ATTRIBUTE_UNUSED, rtx *xop, int *plen)
avr_asm_len ("ld %6,%a1+", xop, plen, 1);
break;
case ADDR_SPACE_PGM:
case ADDR_SPACE_FLASH:
if (AVR_HAVE_LPMX)
avr_asm_len ("lpm %6,%a1+", xop, plen, 1);
@ -9801,11 +9801,11 @@ avr_out_movmem (rtx insn ATTRIBUTE_UNUSED, rtx *xop, int *plen)
"adiw %1,1", xop, plen, 2);
break;
case ADDR_SPACE_PGM1:
case ADDR_SPACE_PGM2:
case ADDR_SPACE_PGM3:
case ADDR_SPACE_PGM4:
case ADDR_SPACE_PGM5:
case ADDR_SPACE_FLASH1:
case ADDR_SPACE_FLASH2:
case ADDR_SPACE_FLASH3:
case ADDR_SPACE_FLASH4:
case ADDR_SPACE_FLASH5:
if (AVR_HAVE_ELPMX)
avr_asm_len ("elpm %6,%a1+", xop, plen, 1);

14
gcc/config/avr/avr.h
View File

@ -158,13 +158,13 @@ extern const avr_addrspace_t avr_addrspace[];
enum
{
ADDR_SPACE_RAM,
ADDR_SPACE_PGM,
ADDR_SPACE_PGM1,
ADDR_SPACE_PGM2,
ADDR_SPACE_PGM3,
ADDR_SPACE_PGM4,
ADDR_SPACE_PGM5,
ADDR_SPACE_PGMX
ADDR_SPACE_FLASH,
ADDR_SPACE_FLASH1,
ADDR_SPACE_FLASH2,
ADDR_SPACE_FLASH3,
ADDR_SPACE_FLASH4,
ADDR_SPACE_FLASH5,
ADDR_SPACE_MEMX
};
#define TARGET_CPU_CPP_BUILTINS() avr_cpu_cpp_builtins (pfile)

14
gcc/config/avr/avr.md
View File

@ -367,7 +367,7 @@
operands[3] = gen_rtx_REG (HImode, REG_Z);
operands[2] = force_operand (XEXP (operands[1], 0), NULL_RTX);
operands[1] = replace_equiv_address (operands[1], operands[3]);
set_mem_addr_space (operands[1], ADDR_SPACE_PGM);
set_mem_addr_space (operands[1], ADDR_SPACE_FLASH);
})
(define_insn "load_<mode>_libgcc"
@ -391,7 +391,7 @@
(clobber (reg:HI REG_Z))]
"can_create_pseudo_p()
&& !avr_xload_libgcc_p (QImode)
&& avr_mem_pgmx_p (operands[1])
&& avr_mem_memx_p (operands[1])
&& REG_P (XEXP (operands[1], 0))"
{ gcc_unreachable(); }
"&& 1"
@ -416,7 +416,7 @@
(clobber (reg:QI 21))
(clobber (reg:HI REG_Z))]
"can_create_pseudo_p()
&& avr_mem_pgmx_p (operands[1])
&& avr_mem_memx_p (operands[1])
&& REG_P (XEXP (operands[1], 0))"
{ gcc_unreachable(); }
"&& 1"
@ -442,7 +442,7 @@
DONE;
})
;; Move value from address space pgmx to a register
;; Move value from address space memx to a register
;; These insns must be prior to respective generic move insn.
(define_insn "xload_8"
@ -495,7 +495,7 @@
rtx dest = operands[0];
rtx src = operands[1];
if (avr_mem_pgm_p (dest))
if (avr_mem_flash_p (dest))
DONE;
/* One of the operands has to be in a register. */
@ -506,7 +506,7 @@
operands[1] = src = copy_to_mode_reg (<MODE>mode, src);
}
if (avr_mem_pgmx_p (src))
if (avr_mem_memx_p (src))
{
rtx addr = XEXP (src, 0);
@ -682,7 +682,7 @@
{
rtx addr = XEXP (operands[1], 0);
if (!avr_mem_pgm_p (operands[1])
if (!avr_mem_flash_p (operands[1])
|| !REG_P (addr)
|| reg_overlap_mentioned_p (addr, operands[0]))
{

6
gcc/config/avr/predicates.md
View File

@ -57,17 +57,17 @@
(and (match_code "const_int")
(match_test "IN_RANGE((INTVAL (op)), 0x20, (0x60 - GET_MODE_SIZE(mode)))")))
;; Return 1 if OP is a general operand not in program memory
;; Return 1 if OP is a general operand not in flash memory
(define_predicate "nop_general_operand"
(and (match_operand 0 "general_operand")
(match_test "!avr_mem_pgm_p (op)")))
(match_test "!avr_mem_flash_p (op)")))
;; Return 1 if OP is an "ordinary" general operand, i.e. a general
;; operand whose load is not handled by a libgcc call or ELPM.
(define_predicate "nox_general_operand"
(and (match_operand 0 "general_operand")
(not (match_test "avr_load_libgcc_p (op)"))
(not (match_test "avr_mem_pgmx_p (op)"))))
(not (match_test "avr_mem_memx_p (op)"))))
;; Return 1 if OP is the zero constant for MODE.
(define_predicate "const0_operand"

58
gcc/doc/extend.texi
View File

@ -1244,38 +1244,38 @@ needed to locate read-only data in flash memory
without using (inline) assembler code.
@table @code
@item __pgm
@cindex @code{__pgm} AVR Named Address Spaces
The @code{__pgm} qualifier will locate data in the
@item __flash
@cindex @code{__flash} AVR Named Address Spaces
The @code{__flash} qualifier will locate data in the
@code{.progmem.data} section. Data will be read using the @code{LPM}
instruction. Pointers to this address space are 16 bits wide.
@item __pgm1
@item __pgm2
@item __pgm3
@item __pgm4
@item __pgm5
@cindex @code{__pgm1} AVR Named Address Spaces
@cindex @code{__pgm2} AVR Named Address Spaces
@cindex @code{__pgm3} AVR Named Address Spaces
@cindex @code{__pgm4} AVR Named Address Spaces
@cindex @code{__pgm5} AVR Named Address Spaces
@item __flash1
@item __flash2
@item __flash3
@item __flash4
@item __flash5
@cindex @code{__flash1} AVR Named Address Spaces
@cindex @code{__flash2} AVR Named Address Spaces
@cindex @code{__flash3} AVR Named Address Spaces
@cindex @code{__flash4} AVR Named Address Spaces
@cindex @code{__flash5} AVR Named Address Spaces
These are 16-bit address spaces locating data in section
@code{.progmem@var{N}.data} where @var{N} refers to
address space @code{__pgm@var{N}}.
address space @code{__flash@var{N}}.
The compiler will set the @code{RAMPZ} segment register approptiately
before reading data by means of the @code{ELPM} instruction.
On devices with less 64@tie{}kiB flash segments as indicated by the address
space, the compiler will cut down the segment number to a number the
device actually supports. Counting starts at@tie{}@code{0}
for space @code{__pgm}. For example, if you access address space
@code{__pgm3} on an ATmega128 device with two 64@tie{}kiB flash segments,
the compiler will generate a read from @code{__pgm1}, i.e.@: it
for space @code{__flash}. For example, if you access address space
@code{__flash3} on an ATmega128 device with two 64@tie{}kiB flash segments,
the compiler will generate a read from @code{__flash1}, i.e.@: it
will load @code{RAMPZ} with@tie{}@code{1} before reading.
@item __pgmx
@cindex @code{__pgmx} AVR Named Address Spaces
@item __memx
@cindex @code{__memx} AVR Named Address Spaces
This is a 24-bit address space that linearizes flash and RAM:
If the high bit of the address is set, data is read from
RAM using the lower two bytes as RAM address.
@ -1288,7 +1288,7 @@ Objects in this address space will be located in @code{.progmem.data}.
@b{Example}
@example
char my_read (const __pgm char ** p)
char my_read (const __flash char ** p)
@{
/* p is a pointer to RAM that points to a pointer to flash.
The first indirection of p will read that flash pointer
@ -1299,7 +1299,7 @@ char my_read (const __pgm char ** p)
@}
/* Locate array[] in flash memory */
const __pgm int array[] = @{ 3, 5, 7, 11, 13, 17, 19 @};
const __flash int array[] = @{ 3, 5, 7, 11, 13, 17, 19 @};
int i = 1;
@ -1316,8 +1316,8 @@ The purpose is to facilitate testing if respective address space
support is available or not:
@example
#ifdef __PGM
const __pgm int var = 1;
#ifdef __FLASH
const __flash int var = 1;
int read_i (void)
@{
@ -1332,7 +1332,7 @@ int read_i (void)
@{
return (int) pgm_read_word (&i);
@}
#endif /* __PGM */
#endif /* __FLASH */
@end example
Notice that attribute @ref{AVR Variable Attributes,@code{progmem}}
@ -1347,13 +1347,13 @@ from @w{@uref{http://nongnu.org/avr-libc/user-manual,avr-libc}}.
@itemize
@item
Reading across the 64@tie{}KiB section boundary of
the @code{__pgm} or @code{__pgm@var{N}} address spaces
the @code{__flash} or @code{__flash@var{N}} address spaces
will show undefined behaviour. The only address space that
supports reading across the 64@tie{}KiB flash segment boundaries is
@code{__pgmx}.
@code{__memx}.
@item
If you use one if the @code{__pgm@var{N}} address spaces
If you use one if the @code{__flash@var{N}} address spaces
you will have to arrange your linker skript to locate the
@code{.progmem@var{N}.data} sections according to your needs.
@ -1372,8 +1372,8 @@ Code like the following is not yet supported because of missing
support in avr-binutils,
see @w{@uref{http://sourceware.org/PR13503,PR13503}}.
@example
extern const __pgmx char foo;
const __pgmx void *pfoo = &foo;
extern const __memx char foo;
const __memx void *pfoo = &foo;
@end example
The code will throw an assembler warning and the high byte of
@code{pfoo} will be initialized with@tie{}@code{0}, i.e.@: the