[testsuite/alpha] Add test for step over fbne instruction

Joel Brobecker
2005-05-20T03:43:02Z

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This is the testcase associated to the following patch:

http://sources.redhat.com/ml/gdb-patches/2005-05/msg00479.html

Without the patch above, the last two tests fail. With the patch, all
tests pass.

2005-05-20 Joel Brobecker <brobecker@adacore.com>

* gdb.arch/alpha-step.c: New file.
* gdb.arch/alpha-step.exp: New testcase.

Tested on alpha-tru64 5.1a.
OK to commit?

Thanks,
--
Joel

[-- Attachment #2: alpha-step.c --]
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/* Copyright 2005 Free Software Foundation, Inc.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */

void gt (void);

int
main (void)
{
gt ();

return 0;
}

/* gt(). Obtained from the following code:

void
gt (void)
{
double a = 360.0;

if (a > 0)
a = 0.0;
else
a = -a;
}

The purpose of the test is to stop just before the check against
zero, and do a stepi. GDB should step one instruction and stop,
rather than letting the program continue until the it terminates. */

asm(" .rdata\n"
" .align 3\n"
"$SYMBOL_LC0:\n"
" .long 0\n"
" .long 1081507840\n"
" .text\n"
" .align 2\n"
" .globl gt\n"
" .ent gt\n"
"gt:\n"
" .frame $15,32,$26,0\n"
" .mask 0x4008000,-32\n"
"$SYMBOL_LM1:\n"
" ldgp $29,0($27)\n"
"$gt..ng:\n"
" lda $30,-32($30)\n"
" stq $26,0($30)\n"
" stq $15,8($30)\n"
" bis $31,$30,$15\n"
" .prologue 1\n"
"$SYMBOL_LM2:\n"
" lda $1,$SYMBOL_LC0\n"
" ldt $f10,0($1)\n"
" stt $f10,16($15)\n"
"$SYMBOL_LM3:\n"
" ldt $f10,16($15)\n"
" cmptlt $f31,$f10,$f10\n"
" fbne $f10,$SYMBOL_L3\n" /* Stop at this instruction. */
" br $31,$SYMBOL_L2\n"
"$SYMBOL_L3:\n"
"$SYMBOL_LM4:\n"
" stt $f31,16($15)\n"
" br $31,$SYMBOL_L4\n"
"$SYMBOL_L2:\n"
"$SYMBOL_LM5:\n"
" ldt $f10,16($15)\n"
" cpysn $f10,$f10,$f10\n"
" stt $f10,16($15)\n"
"$SYMBOL_L4:\n"
"$SYMBOL_LM6:\n"
" bis $31,$15,$30\n"
" ldq $26,0($30)\n"
" ldq $15,8($30)\n"
" lda $30,32($30)\n"
" ret $31,($26),1\n"
" .end gt\n");

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# Copyright 2005 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

if $tracelevel {
strace $tracelevel
}

set prms_id 0
set bug_id 0

if ![istarget "alpha*-*-*"] then {
verbose "Skipping alpha step tests."
return
}

set testfile "alpha-step"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}

if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {}] != "" } {
unsupported "Testcase compile failed."
return -1
}

gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}

if ![runto_main] then {
fail "Can't run to main"
return 0
}

# Insert a breakpoint on a fbne instruction inside gt that we know is
# at gt+48 (the body of gt has been written in assembly, so can not
# change from compiler to compiler). This instruction will cause a jump
# of a couple of instructions forward. Verify that this jump does not
# confuse GDB when steping...

gdb_test "break *gt+48" \
"Breakpoint 2 at .*" \
"breakpoint on fbne instruction"

gdb_test "continue" \
"Breakpoint 2, 0x\[0-9a-fA-F\]+ in gt().*" \
"continue to fbne instruction"

# Extra check to make sure we stopped on the fbne instruction.

gdb_test "x /i \$pc" \
"0x\[0-9a-fA-F\]+ <.*>:\[ \t\]+fbne\[ \t\]+.*" \
"Check breakpoint on fbne instruction"

# Step test, should not cause the inferior to run until completion.

gdb_test "stepi" \
"0x\[0-9a-fA-F\]+.*" \
"stepi on fbne"

# Extra check to verify that we landed on the instruction we expected
# (it should be an stt instruction).

gdb_test "x /i \$pc" \
"0x\[0-9a-fA-F\]+ <.*>:\[ \t\]+stt\[ \t\]+.*" \
"Check stopped on stt instruction"