/* read.c - read a source file -
Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
+ Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
-#if 0
-/* If your chars aren't 8 bits, you will change this a bit.
+/* If your chars aren't 8 bits, you will change this a bit (eg. to 0xFF).
But then, GNU isn't spozed to run on your machine anyway.
(RMS is so shortsighted sometimes.) */
-#define MASK_CHAR (0xFF)
-#else
#define MASK_CHAR ((int)(unsigned char) -1)
-#endif
/* This is the largest known floating point format (for now). It will
grow when we do 4361 style flonums. */
static void do_align (int, char *, int, int);
static void s_align (int, int);
static void s_altmacro (int);
+static void s_bad_end (int);
static int hex_float (int, char *);
static segT get_known_segmented_expression (expressionS * expP);
static void pobegin (void);
{"endc", s_endif, 0},
{"endfunc", s_func, 1},
{"endif", s_endif, 0},
- {"endr", s_bad_endr, 0},
+ {"endm", s_bad_end, 0},
+ {"endr", s_bad_end, 1},
/* endef */
{"equ", s_set, 0},
{"equiv", s_set, 1},
#endif
}
+/* Convert O_constant expression EXP into the equivalent O_big representation.
+ Take the sign of the number from X_unsigned rather than X_add_number. */
+
+static void
+convert_to_bignum (expressionS *exp)
+{
+ valueT value;
+ unsigned int i;
+
+ value = exp->X_add_number;
+ for (i = 0; i < sizeof (exp->X_add_number) / CHARS_PER_LITTLENUM; i++)
+ {
+ generic_bignum[i] = value & LITTLENUM_MASK;
+ value >>= LITTLENUM_NUMBER_OF_BITS;
+ }
+ /* Add a sequence of sign bits if the top bit of X_add_number is not
+ the sign of the original value. */
+ if ((exp->X_add_number < 0) != !exp->X_unsigned)
+ generic_bignum[i++] = exp->X_unsigned ? 0 : LITTLENUM_MASK;
+ exp->X_op = O_big;
+ exp->X_add_number = i;
+}
+
/* For most MRI pseudo-ops, the line actually ends at the first
nonquoted space. This function looks for that point, stuffs a null
in, and sets *STOPCP to the character that used to be there, and
demand_empty_rest_of_line ();
}
-/* Handle the .rept pseudo-op. */
+/* Handle the .endm/.endr pseudo-ops. */
-void
-s_bad_endr (int ignore ATTRIBUTE_UNUSED)
+static void
+s_bad_end (int endr)
{
- as_warn (_(".endr encountered without preceeding .rept, .irc, or .irp"));
+ as_warn (_(".end%c encountered without preceeding %s"),
+ endr ? 'r' : 'm',
+ endr ? ".rept, .irp, or .irpc" : ".macro");
demand_empty_rest_of_line ();
}
pass to md_number_to_chars, handle it as a bignum. */
if (op == O_constant && nbytes > sizeof (valueT))
{
- valueT val;
- int gencnt;
-
- if (!exp->X_unsigned && exp->X_add_number < 0)
- extra_digit = (valueT) -1;
- val = (valueT) exp->X_add_number;
- gencnt = 0;
- do
- {
- generic_bignum[gencnt] = val & LITTLENUM_MASK;
- val >>= LITTLENUM_NUMBER_OF_BITS;
- ++gencnt;
- }
- while (val != 0);
- op = exp->X_op = O_big;
- exp->X_add_number = gencnt;
+ extra_digit = exp->X_unsigned ? 0 : -1;
+ convert_to_bignum (exp);
+ op = O_big;
}
if (op == O_constant)
unsigned byte;
/* Strip leading sign extensions off the bignum. */
- while (size > 0 && bignum[size - 1] == (LITTLENUM_TYPE) -1)
+ while (size > 1
+ && bignum[size - 1] == LITTLENUM_MASK
+ && bignum[size - 2] > LITTLENUM_MASK / 2)
size--;
do
{
- if (loaded < 7 && size > 0)
- {
- val |= (*bignum << loaded);
- loaded += 8 * CHARS_PER_LITTLENUM;
- size--;
- bignum++;
- }
-
- byte = val & 0x7f;
- loaded -= 7;
- val >>= 7;
+ /* OR in the next part of the littlenum. */
+ val |= (*bignum << loaded);
+ loaded += LITTLENUM_NUMBER_OF_BITS;
+ size--;
+ bignum++;
- if (size == 0)
+ /* Add bytes until there are less than 7 bits left in VAL
+ or until every non-sign bit has been written. */
+ do
{
- if ((val == 0 && (byte & 0x40) == 0)
- || (~(val | ~(((valueT) 1 << loaded) - 1)) == 0
- && (byte & 0x40) != 0))
+ byte = val & 0x7f;
+ loaded -= 7;
+ val >>= 7;
+ if (size > 0
+ || val != ((byte & 0x40) == 0 ? 0 : ((valueT) 1 << loaded) - 1))
byte |= 0x80;
+
+ if (orig)
+ *p = byte;
+ p++;
}
+ while ((byte & 0x80) != 0 && loaded >= 7);
+ }
+ while (size > 0);
+ /* Mop up any left-over bits (of which there will be less than 7). */
+ if ((byte & 0x80) != 0)
+ {
+ /* Sign-extend VAL. */
+ if (val & (1 << (loaded - 1)))
+ val |= ~0 << loaded;
if (orig)
- *p = byte;
+ *p = val & 0x7f;
p++;
}
- while (byte & 0x80);
return p - orig;
}
as_warn (_("register value used as expression"));
op = O_constant;
}
+ else if (op == O_constant
+ && sign
+ && (exp->X_add_number < 0) != !exp->X_unsigned)
+ {
+ /* We're outputting a signed leb128 and the sign of X_add_number
+ doesn't reflect the sign of the original value. Convert EXP
+ to a correctly-extended bignum instead. */
+ convert_to_bignum (exp);
+ op = O_big;
+ }
/* Let check_eh_frame know that data is being emitted. nbytes == -1 is
a signal that this is leb128 data. It shouldn't optimize this away. */
}
file_len = ftell (binfile);
- /* If a count was not specified use the size of the file. */
+ /* If a count was not specified use the remainder of the file. */
if (count == 0)
- count = file_len;
+ count = file_len - skip;
- if (skip + count > file_len)
+ if (skip < 0 || count < 0 || file_len < 0 || skip + count > file_len)
{
- as_bad (_("skip (%ld) + count (%ld) larger than file size (%ld)"),
+ as_bad (_("skip (%ld) or count (%ld) invalid for file size (%ld)"),
skip, count, file_len);
goto done;
}