[gdb/testsuite] Add gdb.arch/ppc64-break-on-_exit.exp
Add a regression test-case for commit a50bdb99afe "[gdb/tdep, rs6000] Don't
skip system call in skip_prologue":
- set a breakpoint on a local copy of glibc's _exit, and
- verify that it triggers.
The test-case uses an assembly file by default, but also has the possibility
to use a C source file instead.
Tested on ppc64le-linux. Verified that the test-case fails without
aforementioned commit, and passes with the commit. Both with assembly
and C source.
---
gdb/testsuite/gdb.arch/ppc64-break-on-_exit-main.c | 27 +++++
gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c | 112 +++++++++++++++++++++
gdb/testsuite/gdb.arch/ppc64-break-on-_exit.exp | 56 +++++++++++
gdb/testsuite/gdb.arch/ppc64-break-on-_exit.s | 108 ++++++++++++++++++++
4 files changed, 303 insertions(+)
diff --git a/gdb/testsuite/gdb.arch/ppc64-break-on-_exit-main.c b/gdb/testsuite/gdb.arch/ppc64-break-on-_exit-main.c
new file mode 100644
index 00000000000..77253140e36
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/ppc64-break-on-_exit-main.c
@@ -0,0 +1,27 @@
+/* This file is part of GDB, the GNU debugger.
+
+ Copyright 2021 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 . */
+
+#include
+
+__thread int __libc_errno;
+
+int
+main ()
+{
+ _exit (22);
+ return 0;
+}
diff --git a/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c b/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c
new file mode 100644
index 00000000000..8638a7a6b70
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c
@@ -0,0 +1,112 @@
+/* This file is part of GDB, the GNU debugger.
+
+ Copyright 2021 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 . */
+
+/* This file was generated from glibc's 2.31 _exit.c, by doing a glibc build
+ on ppc64le-linux, copying the command line, adding -g0 -save-temps and
+ recuding the _exit.i file. */
+
+void _exit (int status);
+
+extern __thread int __libc_errno;
+
+void
+_exit (int status)
+{
+ while (1)
+ {
+ ({
+ long int sc_err __attribute__ ((unused));
+ long int sc_ret
+ = ({
+ register long int r0 __asm__ ("r0");
+ register long int r3 __asm__ ("r3");
+ register long int r4 __asm__ ("r4");
+ register long int r5 __asm__ ("r5");
+ register long int r6 __asm__ ("r6");
+ register long int r7 __asm__ ("r7");
+ register long int r8 __asm__ ("r8");
+ long int arg1 = (long int) (status);
+
+ r0 = 234;
+
+ extern void __illegally_sized_syscall_arg1 (void);
+ if (__builtin_classify_type (status) != 5 && sizeof (status) > 8)
+ __illegally_sized_syscall_arg1 ();
+
+ r3 = arg1;
+ __asm__ __volatile__ ("sc\n\t" "mfcr %0\n\t" "0:"
+ : "=&r" (r0), "=&r" (r3), "=&r" (r4),
+ "=&r" (r5), "=&r" (r6), "=&r" (r7),
+ "=&r" (r8) : "0" (r0), "1" (r3)
+ : "r9", "r10", "r11", "r12", "cr0", "ctr", "memory");
+ sc_err = r0;
+
+ r3;
+ });
+
+ if (((void) (sc_ret), __builtin_expect ((sc_err) & (1 << 28), 0)))
+ {
+ (__libc_errno = ((sc_ret)));
+ sc_ret = -1L;
+ }
+
+ sc_ret;
+ });
+
+ ({
+ long int sc_err __attribute__ ((unused));
+ long int sc_ret
+ = ({
+ register long int r0 __asm__ ("r0");
+ register long int r3 __asm__ ("r3");
+ register long int r4 __asm__ ("r4");
+ register long int r5 __asm__ ("r5");
+ register long int r6 __asm__ ("r6");
+ register long int r7 __asm__ ("r7");
+ register long int r8 __asm__ ("r8");
+ long int arg1 = (long int) (status);
+
+ r0 = 1;
+
+ extern void __illegally_sized_syscall_arg1 (void);
+ if (__builtin_classify_type (status) != 5 && sizeof (status) > 8)
+ __illegally_sized_syscall_arg1 ();
+
+ r3 = arg1;
+ __asm__ __volatile__ ("sc\n\t" "mfcr %0\n\t" "0:"
+ : "=&r" (r0), "=&r" (r3), "=&r" (r4),
+ "=&r" (r5), "=&r" (r6), "=&r" (r7),
+ "=&r" (r8) : "0" (r0), "1" (r3)
+ : "r9", "r10", "r11", "r12", "cr0", "ctr", "memory");
+ sc_err = r0;
+
+ r3;
+ });
+
+ if (((void) (sc_ret), __builtin_expect ((sc_err) & (1 << 28), 0)))
+ {
+ (__libc_errno = ((sc_ret)));
+ sc_ret = -1L;
+ }
+
+ sc_ret;
+ });
+
+
+ asm (".long 0");
+ }
+}
diff --git a/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.exp b/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.exp
new file mode 100644
index 00000000000..b2fef8e8b76
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.exp
@@ -0,0 +1,56 @@
+# Copyright 2021 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 .
+
+# Set a breakpoint on a local copy of glibc's _exit, and verify that it
+# triggers. The function does a syscall immediately after the prologue, and
+# if the breakpoint is set past the syscall due to faulty prologue skipping,
+# the breakpoint will not trigger.
+#
+# In particular, we're trying to excercise the instruction analysis
+# functionality of prologue skipping. If non-minimal symbols are
+# read, then that functionality might not be used because f.i.
+# line-info is used instead. So, we use nodebug.
+
+if {![istarget "powerpc*"] || ![is_lp64_target]} {
+ unsupported "Not powerpc64"
+ return
+}
+
+set flags { nodebug }
+if { 1 } {
+ standard_testfile .s -main.c
+} else {
+ standard_testfile .c -main.c
+ lappend flags optimize=-O2
+ lappend flags additional_flags=-fno-stack-protector
+ lappend flags additional_flags=-mlong-double-128
+ lappend flags additional_flags=-fpic
+ lappend flags additional_flags=-ftls-model=initial-exec
+}
+
+if { [prepare_for_testing "failed to prepare" ${testfile} \
+ [list $srcfile $srcfile2] $flags] } {
+ return -1
+}
+
+if ![runto_main] then {
+ return 0
+}
+
+gdb_breakpoint "_exit"
+
+# If the skip_prologue analysis of _exit is too eager, we may not hit the
+# breakpoint.
+gdb_continue_to_breakpoint "_exit" "_exit \\(\\).*"
diff --git a/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.s b/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.s
new file mode 100644
index 00000000000..37a9ace2aff
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.s
@@ -0,0 +1,108 @@
+/* This file is part of GDB, the GNU debugger.
+
+ Copyright 2021 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 . */
+
+/* This file was generated from ppc64-break-on-_exit.c. */
+
+ .file "ppc64-break-on-_exit.c"
+ .abiversion 2
+ .section ".text"
+ .align 2
+ .p2align 4,,15
+ .globl _exit
+ .type _exit, @function
+_exit:
+.LCF0:
+0: addis 2,12,.TOC.-.LCF0@ha
+ addi 2,2,.TOC.-.LCF0@l
+ .localentry _exit,.-_exit
+ addis 9,2,__libc_errno@got@tprel@ha
+ std 31,-8(1)
+ mr 31,3
+ std 30,-16(1)
+ li 0,234
+ ld 9,__libc_errno@got@tprel@l(9)
+ mr 3,31
+ add 30,9,__libc_errno@tls
+#APP
+ # 28 "src/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c" 1
+ sc
+ mfcr 0
+ 0:
+ # 0 "" 2
+#NO_APP
+ andis. 9,0,0x1000
+ mr 9,3
+ li 0,1
+ mr 3,31
+ bne 0,.L13
+ .p2align 4,,15
+.L2:
+#APP
+ # 67 "src/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c" 1
+ sc
+ mfcr 0
+ 0:
+ # 0 "" 2
+#NO_APP
+ andis. 9,0,0x1000
+ bne 0,.L14
+.L3:
+#APP
+ # 87 "src/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c" 1
+ .long 0
+ # 0 "" 2
+#NO_APP
+.L15:
+ li 0,234
+ mr 3,31
+#APP
+ # 28 "src/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c" 1
+ sc
+ mfcr 0
+ 0:
+ # 0 "" 2
+#NO_APP
+ andis. 9,0,0x1000
+ mr 9,3
+ li 0,1
+ mr 3,31
+ beq 0,.L2
+.L13:
+ stw 9,0(30)
+#APP
+ # 67 "src/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c" 1
+ sc
+ mfcr 0
+ 0:
+ # 0 "" 2
+#NO_APP
+ andis. 9,0,0x1000
+ beq 0,.L3
+ .p2align 4,,15
+.L14:
+ stw 3,0(30)
+#APP
+ # 87 "src/gdb/testsuite/gdb.arch/ppc64-break-on-_exit.c" 1
+ .long 0
+ # 0 "" 2
+#NO_APP
+ b .L15
+ .long 0
+ .byte 0,0,0,0,0,2,0,0
+ .size _exit,.-_exit
+ .ident "GCC: (SUSE Linux) 7.5.0"
+ .section .note.GNU-stack,"",@progbits