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authorJulian Brown <julian@codesourcery.com>2013-04-11 10:54:13 +0000
committerJulian Brown <julian@codesourcery.com>2013-04-11 10:54:13 +0000
commit956a6ba3fe11b9dc24212dc65a32b057077e227f (patch)
treea958b9407b1cf3d0a1259b3e7227a5af99094104 /gas
parentcf2cb5ec99be3cb5a30ff86ebf3859de0ffd5115 (diff)
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gas/
* read.c (convert_to_bignum): Add sign parameter. Use it instead of X_unsigned to determine sign of resulting bignum. (emit_expr): Pass extra argument to convert_to_bignum. (emit_leb128_expr): Use X_extrabit instead of X_unsigned. Pass X_extrabit to convert_to_bignum. (parse_bitfield_cons): Set X_extrabit. * expr.c (make_expr_symbol, expr_build_uconstant, operand): Initialise X_extrabit field as appropriate. (add_to_result): New. (subtract_from_result): New. (expr): Use above. * expr.h (expressionS): Add X_extrabit field. gas/testsuite/ * gas/all/sleb128-2.s: New test. * gas/all/sleb128-3.s: Likewise. * gas/all/sleb128-4.s: Likewise. * gas/all/sleb128-5.s: Likewise. * gas/all/sleb128-7.s: Likewise. * gas/all/sleb128-2.d: New. * gas/all/sleb128-3.d: New. * gas/all/sleb123-4.d: New. * gas/all/sleb123-5.d: New. * gas/all/sleb123-7.d: New. * gas/all/gas.exp (sleb128-2, sleb128-3, sleb128-4, sleb128-5) (sleb128-7): Run new tests.
Diffstat (limited to 'gas')
-rw-r--r--gas/ChangeLog15
-rw-r--r--gas/expr.c67
-rw-r--r--gas/expr.h5
-rw-r--r--gas/read.c15
-rw-r--r--gas/testsuite/ChangeLog15
-rw-r--r--gas/testsuite/gas/all/gas.exp5
-rw-r--r--gas/testsuite/gas/all/sleb128-2.d7
-rw-r--r--gas/testsuite/gas/all/sleb128-2.s13
-rw-r--r--gas/testsuite/gas/all/sleb128-3.d7
-rw-r--r--gas/testsuite/gas/all/sleb128-3.s4
-rw-r--r--gas/testsuite/gas/all/sleb128-4.d7
-rw-r--r--gas/testsuite/gas/all/sleb128-4.s13
-rw-r--r--gas/testsuite/gas/all/sleb128-5.d7
-rw-r--r--gas/testsuite/gas/all/sleb128-5.s13
-rw-r--r--gas/testsuite/gas/all/sleb128-7.d7
-rw-r--r--gas/testsuite/gas/all/sleb128-7.s19
16 files changed, 202 insertions, 17 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog
index 4419429..ca37956 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,18 @@
+2013-04-10 Julian Brown <julian@codesourcery.com>
+
+ * read.c (convert_to_bignum): Add sign parameter. Use it
+ instead of X_unsigned to determine sign of resulting bignum.
+ (emit_expr): Pass extra argument to convert_to_bignum.
+ (emit_leb128_expr): Use X_extrabit instead of X_unsigned. Pass
+ X_extrabit to convert_to_bignum.
+ (parse_bitfield_cons): Set X_extrabit.
+ * expr.c (make_expr_symbol, expr_build_uconstant, operand):
+ Initialise X_extrabit field as appropriate.
+ (add_to_result): New.
+ (subtract_from_result): New.
+ (expr): Use above.
+ * expr.h (expressionS): Add X_extrabit field.
+
2013-04-10 Jan Beulich <jbeulich@suse.com>
* gas/config/tc-arm.c (encode_arm_addr_mode_3): Only reject base
diff --git a/gas/expr.c b/gas/expr.c
index 500f938..64011b4 100644
--- a/gas/expr.c
+++ b/gas/expr.c
@@ -90,6 +90,7 @@ make_expr_symbol (expressionS *expressionP)
zero.X_op = O_constant;
zero.X_add_number = 0;
zero.X_unsigned = 0;
+ zero.X_extrabit = 0;
clean_up_expression (&zero);
expressionP = &zero;
}
@@ -161,6 +162,7 @@ expr_build_uconstant (offsetT value)
e.X_op = O_constant;
e.X_add_number = value;
e.X_unsigned = 1;
+ e.X_extrabit = 0;
return make_expr_symbol (&e);
}
@@ -732,6 +734,7 @@ operand (expressionS *expressionP, enum expr_mode mode)
something like ``.quad 0x80000000'' is not sign extended even
though it appears negative if valueT is 32 bits. */
expressionP->X_unsigned = 1;
+ expressionP->X_extrabit = 0;
/* Digits, assume it is a bignum. */
@@ -1026,6 +1029,8 @@ operand (expressionS *expressionP, enum expr_mode mode)
This is compatible with other people's
assemblers. Sigh. */
expressionP->X_unsigned = 0;
+ if (expressionP->X_add_number)
+ expressionP->X_extrabit ^= 1;
}
else if (c == '~' || c == '"')
expressionP->X_add_number = ~ expressionP->X_add_number;
@@ -1078,6 +1083,7 @@ operand (expressionS *expressionP, enum expr_mode mode)
expressionP->X_add_number = i >= expressionP->X_add_number;
expressionP->X_op = O_constant;
expressionP->X_unsigned = 1;
+ expressionP->X_extrabit = 0;
}
}
else if (expressionP->X_op != O_illegal
@@ -1717,6 +1723,42 @@ operatorf (int *num_chars)
/* NOTREACHED */
}
+/* Implement "word-size + 1 bit" addition for
+ {resultP->X_extrabit:resultP->X_add_number} + {rhs_highbit:amount}. This
+ is used so that the full range of unsigned word values and the full range of
+ signed word values can be represented in an O_constant expression, which is
+ useful e.g. for .sleb128 directives. */
+
+static void
+add_to_result (expressionS *resultP, offsetT amount, int rhs_highbit)
+{
+ valueT ures = resultP->X_add_number;
+ valueT uamount = amount;
+
+ resultP->X_add_number += amount;
+
+ resultP->X_extrabit ^= rhs_highbit;
+
+ if (ures + uamount < ures)
+ resultP->X_extrabit ^= 1;
+}
+
+/* Similarly, for subtraction. */
+
+static void
+subtract_from_result (expressionS *resultP, offsetT amount, int rhs_highbit)
+{
+ valueT ures = resultP->X_add_number;
+ valueT uamount = amount;
+
+ resultP->X_add_number -= amount;
+
+ resultP->X_extrabit ^= rhs_highbit;
+
+ if (ures < uamount)
+ resultP->X_extrabit ^= 1;
+}
+
/* Parse an expression. */
segT
@@ -1832,7 +1874,7 @@ expr (int rankarg, /* Larger # is higher rank. */
&& (md_register_arithmetic || resultP->X_op != O_register))
{
/* X + constant. */
- resultP->X_add_number += right.X_add_number;
+ add_to_result (resultP, right.X_add_number, right.X_extrabit);
}
/* This case comes up in PIC code. */
else if (op_left == O_subtract
@@ -1850,10 +1892,11 @@ expr (int rankarg, /* Larger # is higher rank. */
symbol_get_frag (right.X_add_symbol),
&frag_off))
{
- resultP->X_add_number -= right.X_add_number;
- resultP->X_add_number -= frag_off / OCTETS_PER_BYTE;
- resultP->X_add_number += (S_GET_VALUE (resultP->X_add_symbol)
- - S_GET_VALUE (right.X_add_symbol));
+ offsetT symval_diff = S_GET_VALUE (resultP->X_add_symbol)
+ - S_GET_VALUE (right.X_add_symbol);
+ subtract_from_result (resultP, right.X_add_number, right.X_extrabit);
+ subtract_from_result (resultP, frag_off / OCTETS_PER_BYTE, 0);
+ add_to_result (resultP, symval_diff, symval_diff < 0);
resultP->X_op = O_constant;
resultP->X_add_symbol = 0;
}
@@ -1861,7 +1904,7 @@ expr (int rankarg, /* Larger # is higher rank. */
&& (md_register_arithmetic || resultP->X_op != O_register))
{
/* X - constant. */
- resultP->X_add_number -= right.X_add_number;
+ subtract_from_result (resultP, right.X_add_number, right.X_extrabit);
}
else if (op_left == O_add && resultP->X_op == O_constant
&& (md_register_arithmetic || right.X_op != O_register))
@@ -1870,7 +1913,7 @@ expr (int rankarg, /* Larger # is higher rank. */
resultP->X_op = right.X_op;
resultP->X_add_symbol = right.X_add_symbol;
resultP->X_op_symbol = right.X_op_symbol;
- resultP->X_add_number += right.X_add_number;
+ add_to_result (resultP, right.X_add_number, right.X_extrabit);
retval = rightseg;
}
else if (resultP->X_op == O_constant && right.X_op == O_constant)
@@ -1910,7 +1953,9 @@ expr (int rankarg, /* Larger # is higher rank. */
/* Constant + constant (O_add) is handled by the
previous if statement for constant + X, so is omitted
here. */
- case O_subtract: resultP->X_add_number -= v; break;
+ case O_subtract:
+ subtract_from_result (resultP, v, 0);
+ break;
case O_eq:
resultP->X_add_number =
resultP->X_add_number == v ? ~ (offsetT) 0 : 0;
@@ -1954,10 +1999,11 @@ expr (int rankarg, /* Larger # is higher rank. */
resultP->X_op = op_left;
resultP->X_op_symbol = right.X_add_symbol;
if (op_left == O_add)
- resultP->X_add_number += right.X_add_number;
+ add_to_result (resultP, right.X_add_number, right.X_extrabit);
else if (op_left == O_subtract)
{
- resultP->X_add_number -= right.X_add_number;
+ subtract_from_result (resultP, right.X_add_number,
+ right.X_extrabit);
if (retval == rightseg
&& SEG_NORMAL (retval)
&& !S_FORCE_RELOC (resultP->X_add_symbol, 0)
@@ -1977,6 +2023,7 @@ expr (int rankarg, /* Larger # is higher rank. */
resultP->X_op = op_left;
resultP->X_add_number = 0;
resultP->X_unsigned = 1;
+ resultP->X_extrabit = 0;
}
if (retval != rightseg)
diff --git a/gas/expr.h b/gas/expr.h
index cce932d..d2cb7fd 100644
--- a/gas/expr.h
+++ b/gas/expr.h
@@ -136,6 +136,11 @@ typedef struct expressionS {
when performing arithmetic on these values).
FIXME: This field is not set very reliably. */
unsigned int X_unsigned : 1;
+ /* This is used to implement "word size + 1 bit" arithmetic, so that e.g.
+ expressions used with .sleb128 directives can use the full range available
+ for an unsigned word, but can also properly represent all values of a
+ signed word. */
+ unsigned int X_extrabit : 1;
/* 7 additional bits can be defined if needed. */
diff --git a/gas/read.c b/gas/read.c
index 2df748a..082670c 100644
--- a/gas/read.c
+++ b/gas/read.c
@@ -1306,10 +1306,10 @@ read_a_source_file (char *name)
}
/* 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. */
+ Take the sign of the number from SIGN rather than X_add_number. */
static void
-convert_to_bignum (expressionS *exp)
+convert_to_bignum (expressionS *exp, int sign)
{
valueT value;
unsigned int i;
@@ -1322,8 +1322,8 @@ convert_to_bignum (expressionS *exp)
}
/* 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;
+ if ((exp->X_add_number < 0) == !sign)
+ generic_bignum[i++] = sign ? LITTLENUM_MASK : 0;
exp->X_op = O_big;
exp->X_add_number = i;
}
@@ -4250,7 +4250,7 @@ emit_expr (expressionS *exp, unsigned int nbytes)
if (op == O_constant && nbytes > sizeof (valueT))
{
extra_digit = exp->X_unsigned ? 0 : -1;
- convert_to_bignum (exp);
+ convert_to_bignum (exp, !exp->X_unsigned);
op = O_big;
}
@@ -4544,6 +4544,7 @@ parse_bitfield_cons (exp, nbytes)
exp->X_add_number = value;
exp->X_op = O_constant;
exp->X_unsigned = 1;
+ exp->X_extrabit = 0;
}
}
@@ -5103,12 +5104,12 @@ emit_leb128_expr (expressionS *exp, int sign)
}
else if (op == O_constant
&& sign
- && (exp->X_add_number < 0) != !exp->X_unsigned)
+ && (exp->X_add_number < 0) == !exp->X_extrabit)
{
/* 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);
+ convert_to_bignum (exp, exp->X_extrabit);
op = O_big;
}
diff --git a/gas/testsuite/ChangeLog b/gas/testsuite/ChangeLog
index 9f8c2a4..5db53c8 100644
--- a/gas/testsuite/ChangeLog
+++ b/gas/testsuite/ChangeLog
@@ -1,3 +1,18 @@
+2013-04-10 Julian Brown <julian@codesourcery.com>
+
+ * gas/all/sleb128-2.s: New test.
+ * gas/all/sleb128-3.s: Likewise.
+ * gas/all/sleb128-4.s: Likewise.
+ * gas/all/sleb128-5.s: Likewise.
+ * gas/all/sleb128-7.s: Likewise.
+ * gas/all/sleb128-2.d: New.
+ * gas/all/sleb128-3.d: New.
+ * gas/all/sleb123-4.d: New.
+ * gas/all/sleb123-5.d: New.
+ * gas/all/sleb123-7.d: New.
+ * gas/all/gas.exp (sleb128-2, sleb128-3, sleb128-4, sleb128-5)
+ (sleb128-7): Run new tests.
+
2013-04-10 Jan Beulich <jbeulich@suse.com>
* gas/testsuite/gas/arm/ldst-pc.s: Add index, non-writeback
diff --git a/gas/testsuite/gas/all/gas.exp b/gas/testsuite/gas/all/gas.exp
index 72db9cc..c85d918 100644
--- a/gas/testsuite/gas/all/gas.exp
+++ b/gas/testsuite/gas/all/gas.exp
@@ -369,6 +369,11 @@ if { ![istarget "bfin-*-*"] } then {
run_dump_test assign
}
run_dump_test sleb128
+run_dump_test sleb128-2
+run_dump_test sleb128-3
+run_dump_test sleb128-4
+run_dump_test sleb128-5
+run_dump_test sleb128-7
# .byte is 32 bits on tic4x, and .p2align isn't supported on tic54x
# .space is different on hppa*-hpux.
diff --git a/gas/testsuite/gas/all/sleb128-2.d b/gas/testsuite/gas/all/sleb128-2.d
new file mode 100644
index 0000000..f3d052d
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-2.d
@@ -0,0 +1,7 @@
+#objdump : -s -j .data
+#name : .sleb128 tests (2)
+
+.*: .*
+
+Contents of section \.data:
+ .* 7d2a.*
diff --git a/gas/testsuite/gas/all/sleb128-2.s b/gas/testsuite/gas/all/sleb128-2.s
new file mode 100644
index 0000000..49c52af
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-2.s
@@ -0,0 +1,13 @@
+.text
+.globl foo
+foo:
+.L1:
+.byte 0
+.byte 0
+.byte 0
+.L2:
+
+.data
+bar:
+.sleb128 .L1 - .L2
+.byte 42
diff --git a/gas/testsuite/gas/all/sleb128-3.d b/gas/testsuite/gas/all/sleb128-3.d
new file mode 100644
index 0000000..ffb3a26
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-3.d
@@ -0,0 +1,7 @@
+#objdump : -s -j .data
+#name : .sleb128 tests (3)
+
+.*: .*
+
+Contents of section \.data:
+ .* 9c7f2a.*
diff --git a/gas/testsuite/gas/all/sleb128-3.s b/gas/testsuite/gas/all/sleb128-3.s
new file mode 100644
index 0000000..8aa8026
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-3.s
@@ -0,0 +1,4 @@
+.data
+bar:
+.sleb128 100 - 200
+.byte 42
diff --git a/gas/testsuite/gas/all/sleb128-4.d b/gas/testsuite/gas/all/sleb128-4.d
new file mode 100644
index 0000000..80c99ab
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-4.d
@@ -0,0 +1,7 @@
+#objdump : -s -j .data
+#name : .sleb128 tests (4)
+
+.*: .*
+
+Contents of section \.data:
+ .* 83808080 082a.*
diff --git a/gas/testsuite/gas/all/sleb128-4.s b/gas/testsuite/gas/all/sleb128-4.s
new file mode 100644
index 0000000..a2d9d82
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-4.s
@@ -0,0 +1,13 @@
+.text
+.globl foo
+foo:
+.L1:
+.byte 0
+.byte 0
+.byte 0
+.L2:
+
+.data
+bar:
+.sleb128 .L2 - .L1 + (1 << 31)
+.byte 42
diff --git a/gas/testsuite/gas/all/sleb128-5.d b/gas/testsuite/gas/all/sleb128-5.d
new file mode 100644
index 0000000..1e39242
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-5.d
@@ -0,0 +1,7 @@
+#objdump : -s -j .data
+#name : .sleb128 tests (5)
+
+.*: .*
+
+Contents of section \.data:
+ .* 012a.*
diff --git a/gas/testsuite/gas/all/sleb128-5.s b/gas/testsuite/gas/all/sleb128-5.s
new file mode 100644
index 0000000..64e5793
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-5.s
@@ -0,0 +1,13 @@
+.text
+.globl foo
+foo:
+.L1:
+.byte 0
+.byte 0
+.byte 0
+.L2:
+
+.data
+bar:
+.sleb128 .L1 - .L2 + 4
+.byte 42
diff --git a/gas/testsuite/gas/all/sleb128-7.d b/gas/testsuite/gas/all/sleb128-7.d
new file mode 100644
index 0000000..805ee4d
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-7.d
@@ -0,0 +1,7 @@
+#objdump : -s -j .data
+#name : .sleb128 tests (7)
+
+.*: .*
+
+Contents of section \.data:
+ .* cb012ac5 012acb01 2ac5012a.*
diff --git a/gas/testsuite/gas/all/sleb128-7.s b/gas/testsuite/gas/all/sleb128-7.s
new file mode 100644
index 0000000..323689b
--- /dev/null
+++ b/gas/testsuite/gas/all/sleb128-7.s
@@ -0,0 +1,19 @@
+.text
+.globl foo
+foo:
+.L1:
+.byte 0
+.byte 0
+.byte 0
+.L2:
+
+.data
+bar:
+.sleb128 200+(.L2 - .L1)
+.byte 42
+.sleb128 200+(.L1 - .L2)
+.byte 42
+.sleb128 (.L2 - .L1)+200
+.byte 42
+.sleb128 (.L1 - .L2)+200
+.byte 42