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import gcc-toolset-11-gdb-10.2-5.el8

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CentOS Sources 2022-03-29 10:08:07 -04:00 committed by Stepan Oksanichenko
parent 0ffd305e31
commit 8c2762a800
4 changed files with 181 additions and 1 deletions
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5
SOURCES/_gdb.spec.Patch.include
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@ -395,3 +395,8 @@ Patch095: gdb-testsuite26997-fix-array-slices-m32.patch
# Backport "adjust gdb.python/flexible-array-member.exp expected pattern"
# (Simon Marchi)
Patch096: gdb-flexible-array-member-expected-pattern.patch
# Backport "Fix avx512 -m32 support in gdbserver"
# (Tom de Vries, RHBZ 2019936)
Patch097: gdb-rhbz2019936-gdbserver-avx512-m32.patch

1
SOURCES/_gdb.spec.patch.include
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@ -94,3 +94,4 @@
%patch094 -p1
%patch095 -p1
%patch096 -p1
%patch097 -p1

170
SOURCES/gdb-rhbz2019936-gdbserver-avx512-m32.patch Normal file
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@ -0,0 +1,170 @@
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Tom de Vries <tdevries@suse.de>
Date: Mon, 6 Dec 2021 15:39:03 -0500
Subject: gdb-rhbz2019936-gdbserver-avx512-m32.patch
;; Backport "Fix avx512 -m32 support in gdbserver"
;; (Tom de Vries, RHBZ 2019936)
PR27257 reports a problem that can be reproduced as follows:
- use x86_64 machine with avx512 support
- compile a hello world with -m32 to a.out
- start a gdbserver session with a.out
- use gdb to connect to the gdbserver session
This makes us run into:
...
Listening on port 2346
Remote debugging from host ::1, port 34940
src/gdbserver/regcache.cc:257: \
A problem internal to GDBserver has been detected.
Unknown register zmm16h requested
...
The problem is that i387_xsave_to_cache in gdbserver/i387-fp.cc can't find a
register zmm16h in the register cache.
To understand how this happens, first some background.
SSE has 16 128-bit wide xmm registers.
AVX extends the SSE registers set as follows:
- it extends the 16 existing 128-bit wide xmm registers to 256-bit wide ymm
registers.
AVX512 extends the AVX register set as follows:
- it extends the 16 existing 256-bit wide ymm registers to 512-bit wide zmm
registers.
- it adds 16 additional 512-bit wide zmm registers (with corresponding ymm and
xmm subregisters added as well)
However, in 32-bit mode, there are only 8 xmm/ymm/zmm registers.
The problem we're running into is that gdbserver/i387-fp.cc uses these
constants to describe the size of the register file:
...
static const int num_avx512_zmmh_low_registers = 16;
static const int num_avx512_zmmh_high_registers = 16;
static const int num_avx512_ymmh_registers = 16;
static const int num_avx512_xmm_registers = 16;
...
which are all incorrect for the 32-bit case.
Fix this by replacing the constants with variables that have the appropriate
values in 64-bit and 32-bit mode.
Tested on x86_64-linux with native and unix/-m32.
diff --git a/gdbserver/i387-fp.cc b/gdbserver/i387-fp.cc
--- a/gdbserver/i387-fp.cc
+++ b/gdbserver/i387-fp.cc
@@ -23,10 +23,6 @@
static const int num_mpx_bnd_registers = 4;
static const int num_mpx_cfg_registers = 2;
static const int num_avx512_k_registers = 8;
-static const int num_avx512_zmmh_low_registers = 16;
-static const int num_avx512_zmmh_high_registers = 16;
-static const int num_avx512_ymmh_registers = 16;
-static const int num_avx512_xmm_registers = 16;
static const int num_pkeys_registers = 1;
/* Note: These functions preserve the reserved bits in control registers.
@@ -256,14 +252,22 @@ void
i387_cache_to_xsave (struct regcache *regcache, void *buf)
{
struct i387_xsave *fp = (struct i387_xsave *) buf;
+ bool amd64 = register_size (regcache->tdesc, 0) == 8;
int i;
unsigned long val, val2;
unsigned long long xstate_bv = 0;
unsigned long long clear_bv = 0;
char raw[64];
char *p;
+
/* Amd64 has 16 xmm regs; I386 has 8 xmm regs. */
- int num_xmm_registers = register_size (regcache->tdesc, 0) == 8 ? 16 : 8;
+ int num_xmm_registers = amd64 ? 16 : 8;
+ /* AVX512 extends the existing xmm/ymm registers to a wider mode: zmm. */
+ int num_avx512_zmmh_low_registers = num_xmm_registers;
+ /* AVX512 adds 16 extra regs in Amd64 mode, but none in I386 mode.*/
+ int num_avx512_zmmh_high_registers = amd64 ? 16 : 0;
+ int num_avx512_ymmh_registers = amd64 ? 16 : 0;
+ int num_avx512_xmm_registers = amd64 ? 16 : 0;
/* The supported bits in `xstat_bv' are 8 bytes. Clear part in
vector registers if its bit in xstat_bv is zero. */
@@ -452,7 +456,9 @@ i387_cache_to_xsave (struct regcache *regcache, void *buf)
/* Check if any of ZMM16H-ZMM31H registers are changed. */
if ((x86_xcr0 & X86_XSTATE_ZMM))
{
- int zmm16h_regnum = find_regno (regcache->tdesc, "zmm16h");
+ int zmm16h_regnum = (num_avx512_zmmh_high_registers == 0
+ ? -1
+ : find_regno (regcache->tdesc, "zmm16h"));
for (i = 0; i < num_avx512_zmmh_high_registers; i++)
{
@@ -469,7 +475,9 @@ i387_cache_to_xsave (struct regcache *regcache, void *buf)
/* Check if any XMM_AVX512 registers are changed. */
if ((x86_xcr0 & X86_XSTATE_ZMM))
{
- int xmm_avx512_regnum = find_regno (regcache->tdesc, "xmm16");
+ int xmm_avx512_regnum = (num_avx512_xmm_registers == 0
+ ? -1
+ : find_regno (regcache->tdesc, "xmm16"));
for (i = 0; i < num_avx512_xmm_registers; i++)
{
@@ -486,7 +494,9 @@ i387_cache_to_xsave (struct regcache *regcache, void *buf)
/* Check if any YMMH_AVX512 registers are changed. */
if ((x86_xcr0 & X86_XSTATE_ZMM))
{
- int ymmh_avx512_regnum = find_regno (regcache->tdesc, "ymm16h");
+ int ymmh_avx512_regnum = (num_avx512_ymmh_registers == 0
+ ? -1
+ : find_regno (regcache->tdesc, "ymm16h"));
for (i = 0; i < num_avx512_ymmh_registers; i++)
{
@@ -710,12 +720,20 @@ i387_xsave_to_cache (struct regcache *regcache, const void *buf)
{
struct i387_xsave *fp = (struct i387_xsave *) buf;
struct i387_fxsave *fxp = (struct i387_fxsave *) buf;
+ bool amd64 = register_size (regcache->tdesc, 0) == 8;
int i, top;
unsigned long val;
unsigned long long clear_bv;
gdb_byte *p;
- /* Amd64 has 16 xmm regs; I386 has 8 xmm regs. */
- int num_xmm_registers = register_size (regcache->tdesc, 0) == 8 ? 16 : 8;
+
+ /* Amd64 has 16 xmm regs; I386 has 8 xmm regs. */
+ int num_xmm_registers = amd64 ? 16 : 8;
+ /* AVX512 extends the existing xmm/ymm registers to a wider mode: zmm. */
+ int num_avx512_zmmh_low_registers = num_xmm_registers;
+ /* AVX512 adds 16 extra regs in Amd64 mode, but none in I386 mode.*/
+ int num_avx512_zmmh_high_registers = amd64 ? 16 : 0;
+ int num_avx512_ymmh_registers = amd64 ? 16 : 0;
+ int num_avx512_xmm_registers = amd64 ? 16 : 0;
/* The supported bits in `xstat_bv' are 8 bytes. Clear part in
vector registers if its bit in xstat_bv is zero. */
@@ -845,9 +863,15 @@ i387_xsave_to_cache (struct regcache *regcache, const void *buf)
if ((x86_xcr0 & X86_XSTATE_ZMM) != 0)
{
- int zmm16h_regnum = find_regno (regcache->tdesc, "zmm16h");
- int ymm16h_regnum = find_regno (regcache->tdesc, "ymm16h");
- int xmm16_regnum = find_regno (regcache->tdesc, "xmm16");
+ int zmm16h_regnum = (num_avx512_zmmh_high_registers == 0
+ ? -1
+ : find_regno (regcache->tdesc, "zmm16h"));
+ int ymm16h_regnum = (num_avx512_ymmh_registers == 0
+ ? -1
+ : find_regno (regcache->tdesc, "ymm16h"));
+ int xmm16_regnum = (num_avx512_xmm_registers == 0
+ ? -1
+ : find_regno (regcache->tdesc, "xmm16"));
if ((clear_bv & X86_XSTATE_ZMM) != 0)
{

6
SPECS/gdb.spec
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@ -37,7 +37,7 @@ Version: 10.2
# The release always contains a leading reserved number, start it at 1.
# `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
Release: 4%{?dist}
Release: 5%{?dist}
License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and LGPLv3+ and BSD and Public Domain and GFDL
# Do not provide URL for snapshots as the file lasts there only for 2 days.
@ -1157,6 +1157,10 @@ fi
%endif
%changelog
* Wed Dec 8 2021 Keith Seitz <keiths@redhat.com> - 10.2-5.el8
- Backport "Fix avx512 -m32 support in gdbserver"
- (Tom de Vries, RH BZ 2011520)
* Thu Jun 10 2021 Keith Seitz <keiths@redhat.com> - 10.2-4.el8
- Backport "Fix gdb.fortran/array-slices.exp with -m32"
(Tom de Vries, testsuite/269970)