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Re: [rfc][1/2] add suport for 64-bit fpscr in powerpc linux native
- From: Thiago Jung Bauermann <bauerman at BR dot IBM dot COM>
- To: gdb-patches ml <gdb-patches at sourceware dot org>
- Date: Wed, 24 Sep 2008 13:54:00 -0300
- Subject: Re: [rfc][1/2] add suport for 64-bit fpscr in powerpc linux native
- References: <1221436875.17278.4.camel@localhost.localdomain>
Ping?
El dom, 14-09-2008 a las 21:01 -0300, Thiago Jung Bauermann escribiÃ:
> Hi,
>
> The Power ISA 2.05 (implemented by Power6 and later) extended the FPSCR
> from 32 bits to 64 bits. This patch makes GDB on native Linux display
> the full extension of the register when it sees that it is running on
> such a processor. I use the AUXV to detect the feature.
>
> Ran the testsuite on ppc-linux and ppc64-linux, on a machine with 64-bit
> FPSCR and also on a machine with a 32-bit FPSCR. No regressions found.
> Ok?
> --
> []'s
> Thiago Jung Bauermann
> IBM Linux Technology Center
>
> :ADDPATCH powerpc:
>
> 2008-09-14 Thiago Jung Bauermann <bauerman@br.ibm.com>
>
> gdb/
> * ppc-linux-nat.c (ppc_register_u_addr): Add special case to return
> offset for full 64-bit slot of FPSCR when in 32-bits.
> (ppc_linux_read_description): Return target description with 64-bit
> FPSCR when inferior is running on an ISA 2.05 or later processor.
> * ppc-linux-tdep.c (_initialize_ppc_linux_tdep): Call
> initialize_tdec_powerpc_isa205_32l,
> initialize_tdec_powerpc_isa205_altivec32l,
> initialize_tdec_powerpc_isa205_vsx32l,
> initialize_tdec_powerpc_isa205_64l,
> initialize_tdec_powerpc_isa205_altivec64l and
> initialize_tdec_powerpc_isa205_vsx64l.
> * ppc-linux-tdep.h: Add external declaration for
> tdesc_powerpc_isa205_32l, tdesc_powerpc_isa205_altivec32l,
> tdesc_powerpc_isa205_vsx32l, tdesc_powerpc_isa205_64l,
> tdesc_powerpc_isa205_altivec64l and tdesc_powerpc_isa205_vsx64l.
> * features/rs600/powerpc-fpu-isa205.xml: New file.
> * features/rs600/powerpc-isa205-32l.xml: New file.
> * features/rs600/powerpc-isa205-64l.xml: New file.
> * features/rs600/powerpc-isa205-altivec32l.xml: New file.
> * features/rs600/powerpc-isa205-altivec64l.xml: New file.
> * features/rs600/powerpc-isa205-vsx32l.xml: New file.
> * features/rs600/powerpc-isa205-vsx64l.xml: New file.
> * features/rs600/powerpc-isa205-32l.c: Generate.
> * features/rs600/powerpc-isa205-64l.c: Generate.
> * features/rs600/powerpc-isa205-altivec32l.c: Generate.
> * features/rs600/powerpc-isa205-altivec64l.c: Generate.
> * features/rs600/powerpc-isa205-vsx32l.c: Generate.
> * features/rs600/powerpc-isa205-vsx64l.c: Generate.
>
> gdb/testsuite/
>
> * gdb.arch/ppc-dfp.exp: New file.
> * gdb.arch/ppc-dfp.c: New file.
>
> Index: gdb.git/gdb/features/rs6000/power-fpu-isa205.xml
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ gdb.git/gdb/features/rs6000/power-fpu-isa205.xml 2008-09-14 20:58:22.000000000 -0300
> @@ -0,0 +1,44 @@
> +<?xml version="1.0"?>
> +<!-- Copyright (C) 2007, 2008 Free Software Foundation, Inc.
> +
> + Copying and distribution of this file, with or without modification,
> + are permitted in any medium without royalty provided the copyright
> + notice and this notice are preserved. -->
> +
> +<!DOCTYPE feature SYSTEM "gdb-target.dtd">
> +<feature name="org.gnu.gdb.power.fpu">
> + <reg name="f0" bitsize="64" type="ieee_double" regnum="32"/>
> + <reg name="f1" bitsize="64" type="ieee_double"/>
> + <reg name="f2" bitsize="64" type="ieee_double"/>
> + <reg name="f3" bitsize="64" type="ieee_double"/>
> + <reg name="f4" bitsize="64" type="ieee_double"/>
> + <reg name="f5" bitsize="64" type="ieee_double"/>
> + <reg name="f6" bitsize="64" type="ieee_double"/>
> + <reg name="f7" bitsize="64" type="ieee_double"/>
> + <reg name="f8" bitsize="64" type="ieee_double"/>
> + <reg name="f9" bitsize="64" type="ieee_double"/>
> + <reg name="f10" bitsize="64" type="ieee_double"/>
> + <reg name="f11" bitsize="64" type="ieee_double"/>
> + <reg name="f12" bitsize="64" type="ieee_double"/>
> + <reg name="f13" bitsize="64" type="ieee_double"/>
> + <reg name="f14" bitsize="64" type="ieee_double"/>
> + <reg name="f15" bitsize="64" type="ieee_double"/>
> + <reg name="f16" bitsize="64" type="ieee_double"/>
> + <reg name="f17" bitsize="64" type="ieee_double"/>
> + <reg name="f18" bitsize="64" type="ieee_double"/>
> + <reg name="f19" bitsize="64" type="ieee_double"/>
> + <reg name="f20" bitsize="64" type="ieee_double"/>
> + <reg name="f21" bitsize="64" type="ieee_double"/>
> + <reg name="f22" bitsize="64" type="ieee_double"/>
> + <reg name="f23" bitsize="64" type="ieee_double"/>
> + <reg name="f24" bitsize="64" type="ieee_double"/>
> + <reg name="f25" bitsize="64" type="ieee_double"/>
> + <reg name="f26" bitsize="64" type="ieee_double"/>
> + <reg name="f27" bitsize="64" type="ieee_double"/>
> + <reg name="f28" bitsize="64" type="ieee_double"/>
> + <reg name="f29" bitsize="64" type="ieee_double"/>
> + <reg name="f30" bitsize="64" type="ieee_double"/>
> + <reg name="f31" bitsize="64" type="ieee_double"/>
> +
> + <reg name="fpscr" bitsize="64" group="float" regnum="70"/>
> +</feature>
> Index: gdb.git/gdb/features/rs6000/powerpc-isa205-32l.xml
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ gdb.git/gdb/features/rs6000/powerpc-isa205-32l.xml 2008-09-14 20:58:22.000000000 -0300
> @@ -0,0 +1,17 @@
> +<?xml version="1.0"?>
> +<!-- Copyright (C) 2008 Free Software Foundation, Inc.
> +
> + Copying and distribution of this file, with or without modification,
> + are permitted in any medium without royalty provided the copyright
> + notice and this notice are preserved. -->
> +
> +<!-- PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
> + view of the PowerPC. Includes Linux-only special "registers". -->
> +
> +<!DOCTYPE target SYSTEM "gdb-target.dtd">
> +<target>
> + <architecture>powerpc:common</architecture>
> + <xi:include href="power-core.xml"/>
> + <xi:include href="power-fpu-isa205.xml"/>
> + <xi:include href="power-linux.xml"/>
> +</target>
> Index: gdb.git/gdb/features/rs6000/powerpc-isa205-64l.xml
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ gdb.git/gdb/features/rs6000/powerpc-isa205-64l.xml 2008-09-14 20:58:22.000000000 -0300
> @@ -0,0 +1,17 @@
> +<?xml version="1.0"?>
> +<!-- Copyright (C) 2008 Free Software Foundation, Inc.
> +
> + Copying and distribution of this file, with or without modification,
> + are permitted in any medium without royalty provided the copyright
> + notice and this notice are preserved. -->
> +
> +<!-- PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
> + view of the PowerPC. Includes Linux-only special "registers". -->
> +
> +<!DOCTYPE target SYSTEM "gdb-target.dtd">
> +<target>
> + <architecture>powerpc:common64</architecture>
> + <xi:include href="power64-core.xml"/>
> + <xi:include href="power-fpu-isa205.xml"/>
> + <xi:include href="power64-linux.xml"/>
> +</target>
> Index: gdb.git/gdb/features/rs6000/powerpc-isa205-altivec32l.xml
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ gdb.git/gdb/features/rs6000/powerpc-isa205-altivec32l.xml 2008-09-14 20:58:22.000000000 -0300
> @@ -0,0 +1,19 @@
> +<?xml version="1.0"?>
> +<!-- Copyright (C) 2008 Free Software Foundation, Inc.
> +
> + Copying and distribution of this file, with or without modification,
> + are permitted in any medium without royalty provided the copyright
> + notice and this notice are preserved. -->
> +
> +<!-- PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
> + view of the PowerPC. Includes Linux-only special "registers" and AltiVec
> + vector registers. -->
> +
> +<!DOCTYPE target SYSTEM "gdb-target.dtd">
> +<target>
> + <architecture>powerpc:common</architecture>
> + <xi:include href="power-core.xml"/>
> + <xi:include href="power-fpu-isa205.xml"/>
> + <xi:include href="power-linux.xml"/>
> + <xi:include href="power-altivec.xml"/>
> +</target>
> Index: gdb.git/gdb/features/rs6000/powerpc-isa205-altivec64l.xml
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ gdb.git/gdb/features/rs6000/powerpc-isa205-altivec64l.xml 2008-09-14 20:58:22.000000000 -0300
> @@ -0,0 +1,19 @@
> +<?xml version="1.0"?>
> +<!-- Copyright (C) 2008 Free Software Foundation, Inc.
> +
> + Copying and distribution of this file, with or without modification,
> + are permitted in any medium without royalty provided the copyright
> + notice and this notice are preserved. -->
> +
> +<!-- PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
> + view of the PowerPC. Includes Linux-only special "registers" and AltiVec
> + vector registers. -->
> +
> +<!DOCTYPE target SYSTEM "gdb-target.dtd">
> +<target>
> + <architecture>powerpc:common64</architecture>
> + <xi:include href="power64-core.xml"/>
> + <xi:include href="power-fpu-isa205.xml"/>
> + <xi:include href="power64-linux.xml"/>
> + <xi:include href="power-altivec.xml"/>
> +</target>
> Index: gdb.git/gdb/features/rs6000/powerpc-isa205-vsx32l.xml
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ gdb.git/gdb/features/rs6000/powerpc-isa205-vsx32l.xml 2008-09-14 20:58:22.000000000 -0300
> @@ -0,0 +1,20 @@
> +<?xml version="1.0"?>
> +<!-- Copyright (C) 2008 Free Software Foundation, Inc.
> +
> + Copying and distribution of this file, with or without modification,
> + are permitted in any medium without royalty provided the copyright
> + notice and this notice are preserved. -->
> +
> +<!-- PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
> + view of the PowerPC. Includes Linux-only special "registers", AltiVec
> + and VSX vector registers. -->
> +
> +<!DOCTYPE target SYSTEM "gdb-target.dtd">
> +<target>
> + <architecture>powerpc:common</architecture>
> + <xi:include href="power-core.xml"/>
> + <xi:include href="power-fpu-isa205.xml"/>
> + <xi:include href="power-linux.xml"/>
> + <xi:include href="power-altivec.xml"/>
> + <xi:include href="power-vsx.xml"/>
> +</target>
> Index: gdb.git/gdb/features/rs6000/powerpc-isa205-vsx64l.xml
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ gdb.git/gdb/features/rs6000/powerpc-isa205-vsx64l.xml 2008-09-14 20:58:22.000000000 -0300
> @@ -0,0 +1,20 @@
> +<?xml version="1.0"?>
> +<!-- Copyright (C) 2008 Free Software Foundation, Inc.
> +
> + Copying and distribution of this file, with or without modification,
> + are permitted in any medium without royalty provided the copyright
> + notice and this notice are preserved. -->
> +
> +<!-- PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
> + view of the PowerPC. Includes Linux-only special "registers", AltiVec
> + and VSX vector registers. -->
> +
> +<!DOCTYPE target SYSTEM "gdb-target.dtd">
> +<target>
> + <architecture>powerpc:common64</architecture>
> + <xi:include href="power64-core.xml"/>
> + <xi:include href="power-fpu-isa205.xml"/>
> + <xi:include href="power64-linux.xml"/>
> + <xi:include href="power-altivec.xml"/>
> + <xi:include href="power-vsx.xml"/>
> +</target>
> Index: gdb.git/gdb/ppc-linux-nat.c
> ===================================================================
> --- gdb.git.orig/gdb/ppc-linux-nat.c 2008-09-13 17:45:29.000000000 -0300
> +++ gdb.git/gdb/ppc-linux-nat.c 2008-09-14 20:58:23.000000000 -0300
> @@ -60,6 +60,10 @@
> #define PPC_FEATURE_BOOKE 0x00008000
> #endif
>
> +#ifndef PPC_FEATURE_ARCH_2_05
> +#define PPC_FEATURE_ARCH_2_05 0x00001000 /* ISA 2.05 */
> +#endif
> +
> /* Glibc's headers don't define PTRACE_GETVRREGS so we cannot use a
> configure time check. Some older glibc's (for instance 2.2.1)
> don't have a specific powerpc version of ptrace.h, and fall back on
> @@ -279,6 +283,12 @@ ppc_register_u_addr (struct gdbarch *gdb
> hence no adjustment is necessary. Hack around this. */
> if (wordsize == 8 && PT_FPSCR == (48 + 32 + 1))
> u_addr = (48 + 32) * wordsize;
> + /* If the FPSCR is 64-bit wide, we need to fetch the whole 64-bit
> + slot and not just its second word. The PT_FPSCR supplied in a
> + 32-bit GDB compilation doesn't reflect this. */
> + else if (wordsize == 4 && register_size (gdbarch, regno) == 8
> + && PT_FPSCR == (48 + 2*32 + 1))
> + u_addr = (48 + 2*32) * wordsize;
> else
> u_addr = PT_FPSCR * wordsize;
> }
> @@ -1230,6 +1240,7 @@ ppc_linux_read_description (struct targe
> {
> int altivec = 0;
> int vsx = 0;
> + int isa205 = 0;
>
> int tid = TIDGET (inferior_ptid);
> if (tid == 0)
> @@ -1274,6 +1285,9 @@ ppc_linux_read_description (struct targe
> perror_with_name (_("Unable to fetch AltiVec registers"));
> }
>
> + if (ppc_linux_get_hwcap () & PPC_FEATURE_ARCH_2_05)
> + isa205 = 1;
> +
> /* Check for 64-bit inferior process. This is the case when the host is
> 64-bit, and in addition the top bit of the MSR register is set. */
> #ifdef __powerpc64__
> @@ -1284,21 +1298,21 @@ ppc_linux_read_description (struct targe
> if (errno == 0 && msr < 0)
> {
> if (vsx)
> - return tdesc_powerpc_vsx64l;
> + return isa205? tdesc_powerpc_isa205_vsx64l : tdesc_powerpc_vsx64l;
> else if (altivec)
> - return tdesc_powerpc_altivec64l;
> + return isa205? tdesc_powerpc_isa205_altivec64l : tdesc_powerpc_altivec64l;
>
> - return tdesc_powerpc_64l;
> + return isa205? tdesc_powerpc_isa205_64l : tdesc_powerpc_64l;
> }
> }
> #endif
>
> if (vsx)
> - return tdesc_powerpc_vsx32l;
> + return isa205? tdesc_powerpc_isa205_vsx32l : tdesc_powerpc_vsx32l;
> else if (altivec)
> - return tdesc_powerpc_altivec32l;
> + return isa205? tdesc_powerpc_isa205_altivec32l : tdesc_powerpc_altivec32l;
>
> - return tdesc_powerpc_32l;
> + return isa205? tdesc_powerpc_isa205_32l : tdesc_powerpc_32l;
> }
>
> void _initialize_ppc_linux_nat (void);
> Index: gdb.git/gdb/ppc-linux-tdep.c
> ===================================================================
> --- gdb.git.orig/gdb/ppc-linux-tdep.c 2008-09-13 17:45:29.000000000 -0300
> +++ gdb.git/gdb/ppc-linux-tdep.c 2008-09-14 20:58:23.000000000 -0300
> @@ -42,9 +42,15 @@
> #include "features/rs6000/powerpc-32l.c"
> #include "features/rs6000/powerpc-altivec32l.c"
> #include "features/rs6000/powerpc-vsx32l.c"
> +#include "features/rs6000/powerpc-isa205-32l.c"
> +#include "features/rs6000/powerpc-isa205-altivec32l.c"
> +#include "features/rs6000/powerpc-isa205-vsx32l.c"
> #include "features/rs6000/powerpc-64l.c"
> #include "features/rs6000/powerpc-altivec64l.c"
> #include "features/rs6000/powerpc-vsx64l.c"
> +#include "features/rs6000/powerpc-isa205-64l.c"
> +#include "features/rs6000/powerpc-isa205-altivec64l.c"
> +#include "features/rs6000/powerpc-isa205-vsx64l.c"
> #include "features/rs6000/powerpc-e500l.c"
>
>
> @@ -1170,8 +1176,14 @@ _initialize_ppc_linux_tdep (void)
> initialize_tdesc_powerpc_32l ();
> initialize_tdesc_powerpc_altivec32l ();
> initialize_tdesc_powerpc_vsx32l ();
> + initialize_tdesc_powerpc_isa205_32l ();
> + initialize_tdesc_powerpc_isa205_altivec32l ();
> + initialize_tdesc_powerpc_isa205_vsx32l ();
> initialize_tdesc_powerpc_64l ();
> initialize_tdesc_powerpc_altivec64l ();
> initialize_tdesc_powerpc_vsx64l ();
> + initialize_tdesc_powerpc_isa205_64l ();
> + initialize_tdesc_powerpc_isa205_altivec64l ();
> + initialize_tdesc_powerpc_isa205_vsx64l ();
> initialize_tdesc_powerpc_e500l ();
> }
> Index: gdb.git/gdb/ppc-linux-tdep.h
> ===================================================================
> --- gdb.git.orig/gdb/ppc-linux-tdep.h 2008-09-13 17:45:29.000000000 -0300
> +++ gdb.git/gdb/ppc-linux-tdep.h 2008-09-14 20:58:23.000000000 -0300
> @@ -42,9 +42,15 @@ int ppc_linux_trap_reg_p (struct gdbarch
> extern struct target_desc *tdesc_powerpc_32l;
> extern struct target_desc *tdesc_powerpc_altivec32l;
> extern struct target_desc *tdesc_powerpc_vsx32l;
> +extern struct target_desc *tdesc_powerpc_isa205_32l;
> +extern struct target_desc *tdesc_powerpc_isa205_altivec32l;
> +extern struct target_desc *tdesc_powerpc_isa205_vsx32l;
> extern struct target_desc *tdesc_powerpc_e500l;
> extern struct target_desc *tdesc_powerpc_64l;
> extern struct target_desc *tdesc_powerpc_altivec64l;
> extern struct target_desc *tdesc_powerpc_vsx64l;
> +extern struct target_desc *tdesc_powerpc_isa205_64l;
> +extern struct target_desc *tdesc_powerpc_isa205_altivec64l;
> +extern struct target_desc *tdesc_powerpc_isa205_vsx64l;
>
> #endif /* PPC_LINUX_TDEP_H */
> Index: gdb.git/gdb/testsuite/gdb.arch/ppc-dfp.c
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ gdb.git/gdb/testsuite/gdb.arch/ppc-dfp.c 2008-09-14 20:58:23.000000000 -0300
> @@ -0,0 +1,46 @@
> +/* Copyright 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
> +
> +#include <elf.h>
> +
> +#ifdef __powerpc64__
> +typedef Elf64_auxv_t auxv_t;
> +#else
> +typedef Elf32_auxv_t auxv_t;
> +#endif
> +
> +#ifndef PPC_FEATURE_HAS_DFP
> +#define PPC_FEATURE_HAS_DFP 0x00000400
> +#endif
> +
> +int
> +main (int argc, char *argv[], char *envp[], auxv_t auxv[])
> +{
> + int i;
> +
> + for (i = 0; auxv[i].a_type != AT_NULL; i++)
> + if (auxv[i].a_type == AT_HWCAP) {
> + if (!(auxv[i].a_un.a_val & PPC_FEATURE_HAS_DFP))
> + return 1;
> +
> + break;
> + }
> +
> + asm ("mtfsfi 7, 5, 1\n"); /* Set DFP rounding mode. */
> +
> + return 0;
> +}
> Index: gdb.git/gdb/testsuite/gdb.arch/ppc-dfp.exp
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ gdb.git/gdb/testsuite/gdb.arch/ppc-dfp.exp 2008-09-14 20:58:39.000000000 -0300
> @@ -0,0 +1,82 @@
> +# Copyright (C) 2008 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 3 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, see <http://www.gnu.org/licenses/>.
> +#
> +# Please email any bugs, comments, and/or additions to this file to:
> +# bug-gdb@prep.ai.mit.edu
> +#
> +
> +# Tests for Powerpc Decimal Floating Point registers setting and fetching
> +
> +if $tracelevel then {
> + strace $tracelevel
> +}
> +
> +if ![istarget "powerpc*"] then {
> + verbose "Skipping powerpc decimal floating point register tests."
> + return
> +}
> +
> +set testfile "ppc-dfp"
> +set binfile ${objdir}/${subdir}/${testfile}
> +set srcfile ${testfile}.c
> +
> +if [get_compiler_info $binfile] {
> + warning "get_compiler failed"
> + return -1
> +}
> +
> +if ![test_compiler_info gcc*] {
> + # We use GCC's extended asm syntax
> + warning "unknown compiler"
> + return -1
> +}
> +
> +if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {quiet debug}] != "" } {
> + unsupported "This machine doesn't support Decimal Floating Point."
> + return -1
> +}
> +
> +# Start with a fresh gdb.
> +
> +gdb_exit
> +gdb_start
> +gdb_reinitialize_dir $srcdir/$subdir
> +gdb_load ${binfile}
> +
> +gdb_breakpoint [gdb_get_line_number "Set DFP rounding mode."]
> +
> +gdb_run_cmd
> +
> +# When the prompt comes back we'll be at the Set DFP rounding mode breakpoint.
> +# Unless the program bails out after checking AT_HWCAP.
> +gdb_expect {
> + -re "Program exited with code 01.\[\r\n\]+$gdb_prompt $" {
> + unsupported "This machine doesn't support Decimal Floating Point."
> + return -1
> + }
> +
> + -re ".*$gdb_prompt $" {}
> +}
> +
> +# First, verify if FPSCR is all zeroes.
> +gdb_test "print \$fpscr" " = 0" "FPSCR is all zeroes"
> +
> +# Step over "set rounding mode" instruction.
> +gdb_test "next" "" ""
> +
> +# Verify that the following bits are set (See Power ISA for details):
> +#
> +# 29:31 - DFP Rounding Control
> +gdb_test "print/t \$fpscr" " = 10100000000000000000000000000000000" "FPSCR for round to nearest, ties toward zero rounding mode"
>
>
--
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center