2014-01-01 03:54:24 +00:00
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/* Copyright 2009-2014 Free Software Foundation, Inc.
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Fix the x87 FP register printout when issuing the “info float” command.
Consider the following simple program:
.globl _start
.text
_start:
fldt val
.data
val: .byte 0x00,0x00,0x45,0x07,0x11,0x19,0x22,0xe9,0xfe,0xbf
With current GDB on x86-64 GNU/Linux hosts, after the moment the fldt
command has been executed the register st(0) looks like this,
according to the “info regs” output (TOP=7):
R7: Valid 0xffffffbffffffffeffffffe922191107450000 -0.910676542908976927
which is clearly wrong (just count its length). The problem is due to
the printf statement (see patch) printing a promoted integer value of
a char argument "raw[i]", and, since char is signed on x86-64
GNU/Linux, the erroneous “ffffff” are printed for the first three
bytes which turn out to be "negative". The fix is to use gdb_byte
instead which is unsigned (and is the type of value_contents(), the
type to be used for raw target bytes anyway). After the fix the value
will be printed correctly:
R7: Valid 0xbffee922191107450000 -0.910676542908976927
gdb/
2013-04-19 Vladimir Kargov <kargov@gmail.com>
Pedro Alves <palves@redhat.com>
* i387-tdep.c (i387_print_float_info): Use gdb_byte for pointer to
value contents.
gdb/testsuite/
2013-04-19 Vladimir Kargov <kargov@gmail.com>
Pedro Alves <palves@redhat.com>
* gdb.arch/i386-float.S: New file.
* gdb.arch/i386-float.exp: New file.
2013-04-19 14:13:30 +00:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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This file is part of the gdb testsuite. */
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#define CONCAT1(a, b) CONCAT2(a, b)
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#define CONCAT2(a, b) a ## b
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#ifdef SYMBOL_PREFIX
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# define SYMBOL(str) CONCAT1(SYMBOL_PREFIX, str)
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#else
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# define SYMBOL(str) str
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#endif
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.text
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.globl SYMBOL(main)
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SYMBOL(main):
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fninit
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fldt val
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ret
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.data
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val: .byte 0x00,0x00,0x45,0x07,0x11,0x19,0x22,0xe9,0xfe,0xbf
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