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5463a15c18
When running test-case gdb.reverse/pipe-reverse.exp on openSUSE Tumbleweed, I run into: ... (gdb) continue^M Continuing.^M ^M Catchpoint 2 (returned from syscall pipe2), in pipe () from /lib64/libc.so.6^M (gdb) FAIL: gdb.base/catch-syscall.exp: without arguments: \ syscall pipe has returned ... The current glibc on Tumbleweed is 2.35, which contains commit "linux: Implement pipe in terms of __NR_pipe2", and consequently syscall pipe2 is used instead of syscall pipe. Fix this by detecting whether syscall pipe or pipe2 is used before running the tests. Tested on x86_64-linux, specifically on: - openSUSE Tumbleweed (with glibc 2.35), and - openSUSE Leap 15.3 (with glibc 2.31). On openSUSE Tumbleweed + target board unix/-m32, this exposes: ... (gdb) catch syscall pipe2^M Unknown syscall name 'pipe2'.^M ... which will be fixed in a folllow-up patch. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29056
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/* This file is used to test the 'catch syscall' feature on GDB.
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Please, if you are going to edit this file DO NOT change the syscalls
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being called (nor the order of them). If you really must do this, then
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take a look at catch-syscall.exp and modify there too.
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Written by Sergio Durigan Junior <sergiodj@linux.vnet.ibm.com>
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September, 2008 */
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sched.h>
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/* These are the syscalls numbers used by the test. */
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int close_syscall = SYS_close;
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int chroot_syscall = SYS_chroot;
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/* GDB had a bug where it couldn't catch syscall number 0 (PR 16297).
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In most GNU/Linux architectures, syscall number 0 is
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restart_syscall, which can't be called from userspace. However,
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the "read" syscall is zero on x86_64. */
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int read_syscall = SYS_read;
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#ifdef SYS_pipe
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int pipe_syscall = SYS_pipe;
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#endif
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#ifdef SYS_pipe2
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int pipe2_syscall = SYS_pipe2;
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#endif
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int write_syscall = SYS_write;
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#if defined(__arm__)
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/* Although 123456789 is an illegal syscall umber on arm linux, kernel
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sends SIGILL rather than returns -ENOSYS. However, arm linux kernel
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returns -ENOSYS if syscall number is within 0xf0001..0xf07ff, so we
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can use 0xf07ff for unknown_syscall in test. */
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int unknown_syscall = 0x0f07ff;
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#else
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int unknown_syscall = 123456789;
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#endif
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int exit_group_syscall = SYS_exit_group;
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/* Set by the test when it wants execve. */
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int do_execve = 0;
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int
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main (int argc, char *const argv[])
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{
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int fd[2];
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char buf1[2] = "a";
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char buf2[2];
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/* Test a simple self-exec, but only on request. */
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if (do_execve)
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execv (*argv, argv);
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/* A close() with a wrong argument. We are only
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interested in the syscall. */
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close (-1);
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chroot (".");
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pipe (fd);
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write (fd[1], buf1, sizeof (buf1));
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read (fd[0], buf2, sizeof (buf2));
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/* Test vfork-event interactions. Child exits immediately.
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(Plain fork won't work on no-mmu kernel configurations.) */
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if (vfork () == 0)
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_exit (0);
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/* Trigger an intentional ENOSYS. */
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syscall (unknown_syscall);
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/* The last syscall. Do not change this. */
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_exit (0);
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}
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