452 lines
16 KiB
Diff
452 lines
16 KiB
Diff
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=216711
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FIXME: This workaround should be dropped and
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glibc/sysdeps/unix/sysv/linux/x86_64/clone.S should get CFI for the child
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instead.
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2006-12-17 Jan Kratochvil <jan.kratochvil@redhat.com>
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* gdb/amd64-linux-tdep.c (linux_clone_code): New variable.
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(LINUX_CLONE_LEN): New definition.
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(amd64_linux_clone_running, amd64_linux_outermost_frame): New function.
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(amd64_linux_init_abi): Initialize `outermost_frame_p'.
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* gdb/i386-tdep.c (i386_gdbarch_init): Likewise.
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* gdb/i386-tdep.h (gdbarch_tdep): Add `outermost_frame_p' member.
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* gdb/amd64-tdep.c (amd64_frame_this_id): Call `outermost_frame_p'.
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2006-12-17 Jan Kratochvil <jan.kratochvil@redhat.com>
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* gdb.threads/bt-clone-stop.exp, gdb.threads/bt-clone-stop.c:
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New file.
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2007-10-16 Jan Kratochvil <jan.kratochvil@redhat.com>
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Port to GDB-6.7.
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Index: gdb-7.6.90.20140127/gdb/amd64-linux-tdep.c
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===================================================================
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--- gdb-7.6.90.20140127.orig/gdb/amd64-linux-tdep.c 2014-02-04 23:40:06.263483469 +0100
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+++ gdb-7.6.90.20140127/gdb/amd64-linux-tdep.c 2014-02-04 23:47:18.438009290 +0100
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@@ -289,6 +289,80 @@ amd64_linux_register_reggroup_p (struct
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/* Set the program counter for process PTID to PC. */
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+/* Detect the outermost frame; during unwind of
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+ #5 0x000000305cec68c3 in clone () from /lib64/tls/libc.so.6
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+ avoid the additional bogus frame
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+ #6 0x0000000000000000 in ??
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+ We compare if the `linux_clone_code' block is _before_ unwound PC. */
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+
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+static const unsigned char linux_clone_code[] =
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+{
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+/* libc/sysdeps/unix/sysv/linux/x86_64/clone.S */
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+/* #ifdef RESET_PID */
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+/* ... */
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+/* mov $SYS_ify(getpid), %eax */
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+/* 0xb8, 0x27, 0x00, 0x00, 0x00 */
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+/* OR */
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+/* mov $SYS_ify(getpid), %rax */
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+/* 0x48, 0xc7, 0xc0, 0x27, 0x00, 0x00, 0x00 */
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+/* so just: */
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+ 0x27, 0x00, 0x00, 0x00,
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+/* syscall */
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+ 0x0f, 0x05,
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+/* movl %eax, %fs:PID */
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+ 0x64, 0x89, 0x04, 0x25, 0x94, 0x00, 0x00, 0x00,
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+/* movl %eax, %fs:TID */
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+ 0x64, 0x89, 0x04, 0x25, 0x90, 0x00, 0x00, 0x00,
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+/* #endif */
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+/* |* Set up arguments for the function call. *| */
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+/* popq %rax |* Function to call. *| */
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+ 0x58,
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+/* popq %rdi |* Argument. *| */
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+ 0x5f,
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+/* call *%rax$ */
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+ 0xff, 0xd0
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+};
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+
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+#define LINUX_CLONE_LEN (sizeof linux_clone_code)
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+
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+static int
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+amd64_linux_clone_running (struct frame_info *this_frame)
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+{
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+ CORE_ADDR pc = get_frame_pc (this_frame);
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+ unsigned char buf[LINUX_CLONE_LEN];
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+
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+ if (!safe_frame_unwind_memory (this_frame, pc - LINUX_CLONE_LEN, buf,
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+ LINUX_CLONE_LEN))
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+ return 0;
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+
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+ if (memcmp (buf, linux_clone_code, LINUX_CLONE_LEN) != 0)
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+ return 0;
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+
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+ return 1;
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+}
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+
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+static int
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+amd64_linux_outermost_frame (struct frame_info *this_frame)
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+{
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+ CORE_ADDR pc = get_frame_pc (this_frame);
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+ const char *name;
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+
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+ find_pc_partial_function (pc, &name, NULL, NULL);
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+
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+ /* If we have NAME, we can optimize the search.
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+ `clone' NAME still needs to have the code checked as its name may be
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+ present in the user code.
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+ `__clone' NAME should not be present in the user code but in the initial
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+ parts of the `__clone' implementation the unwind still makes sense.
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+ More detailed unwinding decision would be too much sensitive to possible
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+ subtle changes in specific glibc revisions. */
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+ if (name == NULL || strcmp (name, "clone") == 0
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+ || strcmp ("__clone", name) == 0)
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+ return (amd64_linux_clone_running (this_frame) != 0);
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+
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+ return 0;
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+}
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+
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static void
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amd64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
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{
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@@ -1607,6 +1681,8 @@ amd64_linux_init_abi_common(struct gdbar
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tdep->xsave_xcr0_offset = I386_LINUX_XSAVE_XCR0_OFFSET;
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+ tdep->outermost_frame_p = amd64_linux_outermost_frame;
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+
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/* Add the %orig_rax register used for syscall restarting. */
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set_gdbarch_write_pc (gdbarch, amd64_linux_write_pc);
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Index: gdb-7.6.90.20140127/gdb/amd64-tdep.c
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===================================================================
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--- gdb-7.6.90.20140127.orig/gdb/amd64-tdep.c 2014-02-04 23:40:06.265483471 +0100
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+++ gdb-7.6.90.20140127/gdb/amd64-tdep.c 2014-02-04 23:45:40.846891653 +0100
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@@ -2359,6 +2359,7 @@ amd64_frame_unwind_stop_reason (struct f
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{
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struct amd64_frame_cache *cache =
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amd64_frame_cache (this_frame, this_cache);
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+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (this_frame));
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if (!cache->base_p)
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return UNWIND_UNAVAILABLE;
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@@ -2367,6 +2368,10 @@ amd64_frame_unwind_stop_reason (struct f
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if (cache->base == 0)
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return UNWIND_OUTERMOST;
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+ /* Detect OS dependent outermost frames; such as `clone'. */
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+ if (tdep->outermost_frame_p && tdep->outermost_frame_p (this_frame))
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+ return UNWIND_OUTERMOST;
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+
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return UNWIND_NO_REASON;
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}
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@@ -2498,6 +2503,7 @@ amd64_sigtramp_frame_this_id (struct fra
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{
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struct amd64_frame_cache *cache =
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amd64_sigtramp_frame_cache (this_frame, this_cache);
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+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (this_frame));
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if (!cache->base_p)
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(*this_id) = frame_id_build_unavailable_stack (get_frame_pc (this_frame));
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@@ -2506,6 +2512,11 @@ amd64_sigtramp_frame_this_id (struct fra
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/* This marks the outermost frame. */
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return;
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}
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+ else if (tdep->outermost_frame_p && tdep->outermost_frame_p (this_frame))
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+ {
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+ /* Detect OS dependent outermost frames; such as `clone'. */
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+ return;
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+ }
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else
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(*this_id) = frame_id_build (cache->base + 16, get_frame_pc (this_frame));
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}
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Index: gdb-7.6.90.20140127/gdb/i386-tdep.c
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===================================================================
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--- gdb-7.6.90.20140127.orig/gdb/i386-tdep.c 2014-02-04 23:40:06.267483473 +0100
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+++ gdb-7.6.90.20140127/gdb/i386-tdep.c 2014-02-04 23:43:33.048734974 +0100
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@@ -7830,6 +7830,9 @@ i386_gdbarch_init (struct gdbarch_info i
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tdep->xsave_xcr0_offset = -1;
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+ /* Unwinding stops on i386 automatically. */
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+ tdep->outermost_frame_p = NULL;
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+
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tdep->record_regmap = i386_record_regmap;
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set_gdbarch_long_long_align_bit (gdbarch, 32);
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Index: gdb-7.6.90.20140127/gdb/i386-tdep.h
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===================================================================
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--- gdb-7.6.90.20140127.orig/gdb/i386-tdep.h 2014-02-04 23:40:06.268483475 +0100
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+++ gdb-7.6.90.20140127/gdb/i386-tdep.h 2014-02-04 23:43:33.048734974 +0100
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@@ -192,6 +192,9 @@ struct gdbarch_tdep
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int (*i386_sysenter_record) (struct regcache *regcache);
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/* Parse syscall args. */
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int (*i386_syscall_record) (struct regcache *regcache);
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+
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+ /* Detect OS dependent outermost frames; such as `clone'. */
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+ int (*outermost_frame_p) (struct frame_info *this_frame);
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};
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/* Floating-point registers. */
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Index: gdb-7.6.90.20140127/gdb/ia64-tdep.c
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===================================================================
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--- gdb-7.6.90.20140127.orig/gdb/ia64-tdep.c 2014-02-04 23:40:06.270483477 +0100
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+++ gdb-7.6.90.20140127/gdb/ia64-tdep.c 2014-02-04 23:43:33.049734975 +0100
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@@ -2176,6 +2176,138 @@ static const struct frame_unwind ia64_fr
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default_frame_sniffer
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};
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+/* Detect the outermost frame; during unwind of
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+ #6 0x2000000000347100 in __clone2 () from /lib/libc.so.6.1
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+ avoid the additional bogus frame
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+ #7 0x0000000000000000 in ?? () */
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+
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+static char linux_clone2_code[] =
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+{
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+/* libc/sysdeps/unix/sysv/linux/ia64/clone2.S */
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+ 0x09, 0x00, 0x20, 0x12, 0x90, 0x11, 0x00, 0x40,
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+ 0x28, 0x20, 0x23, 0x00, 0x00, 0x00, 0x04, 0x00,
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+/* st4 [r9]=r8 */
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+/* st4 [r10]=r8 */
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+/* ;; */
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+/* #endif */
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+ 0x02, 0x50, 0x21, 0x40, 0x18, 0x14, 0x90, 0x02,
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+ 0x90, 0x00, 0x42, 0x00, 0x00, 0x00, 0x04, 0x00,
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+/* 1: ld8 out1=[in0],8 |* Retrieve code pointer. *| */
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+/* mov out0=in4 |* Pass proper argument to fn *| */
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+/* ;; */
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+ 0x11, 0x08, 0x00, 0x40, 0x18, 0x10, 0x60, 0x50,
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+ 0x05, 0x80, 0x03, 0x00, 0x68, 0x00, 0x80, 0x12,
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+/* ld8 gp=[in0] |* Load function gp. *| */
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+/* mov b6=out1 */
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+/* br.call.dptk.many rp=b6 |* Call fn(arg) in the child *| */
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+/* ;; */
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+ 0x10, 0x48, 0x01, 0x10, 0x00, 0x21, 0x10, 0x00,
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+ 0xa0, 0x00, 0x42, 0x00, 0x98, 0xdf, 0xf7, 0x5b,
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+/* mov out0=r8 |* Argument to _exit *| */
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+/* mov gp=loc0 */
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+/* .globl HIDDEN_JUMPTARGET(_exit) */
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+/* br.call.dpnt.many rp=HIDDEN_JUMPTARGET(_exit) */
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+/* |* call _exit with result from fn. *| */
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+ 0x11, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
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+ 0x00, 0x02, 0x00, 0x80, 0x00, 0x00, 0x84, 0x00
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+/* ret |* Not reached. *| */
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+};
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+
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+#define LINUX_CLONE_PRE_SLOTS 3 /* Number of slots before PC. */
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+#define LINUX_CLONE_LEN (sizeof linux_clone2_code)
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+
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+static int
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+ia64_linux_clone2_running (struct frame_info *this_frame)
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+{
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+ CORE_ADDR pc = get_frame_pc (this_frame);
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+ char buf[LINUX_CLONE_LEN];
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+ struct minimal_symbol *minsym;
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+ long long instr;
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+
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+ if (!safe_frame_unwind_memory (this_frame, pc - LINUX_CLONE_PRE_SLOTS * 16,
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+ buf, LINUX_CLONE_LEN))
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+ return 0;
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+
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+ if (memcmp (buf, linux_clone2_code, LINUX_CLONE_PRE_SLOTS * 16) != 0)
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+ return 0;
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+
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+ /* Adjust the expected "_exit" address. */
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+ minsym = lookup_minimal_symbol_text ("_exit", NULL);
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+ if (minsym == NULL)
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+ return 0;
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+
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+ instr = slotN_contents (&linux_clone2_code[LINUX_CLONE_PRE_SLOTS * 16], 2);
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+ instr &= ~(((1L << 20) - 1) << 13);
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+ /* Address is relative to the jump instruction slot, not the next one. */
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+ instr |= (((SYMBOL_VALUE_ADDRESS (minsym) - (pc & ~0xfL)) >> 4)
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+ & ((1L << 20) - 1)) << 13;
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+ replace_slotN_contents (&linux_clone2_code[LINUX_CLONE_PRE_SLOTS * 16], instr,
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+ 2);
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+
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+ if (memcmp (&buf[LINUX_CLONE_PRE_SLOTS * 16],
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+ &linux_clone2_code[LINUX_CLONE_PRE_SLOTS * 16],
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+ LINUX_CLONE_LEN - (LINUX_CLONE_PRE_SLOTS * 16)) != 0)
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+ return 0;
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+
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+ return 1;
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+}
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+
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+static int
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+ia64_outermost_frame (struct frame_info *this_frame)
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+{
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+ CORE_ADDR pc = get_frame_pc (this_frame);
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+ char *name;
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+
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+ find_pc_partial_function (pc, &name, NULL, NULL);
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+
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+ /* If we have NAME, we can optimize the search.
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+ `clone' NAME still needs to have the code checked as its name may be
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+ present in the user code.
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+ `__clone' NAME should not be present in the user code but in the initial
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+ parts of the `__clone' implementation the unwind still makes sense.
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+ More detailed unwinding decision would be too much sensitive to possible
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+ subtle changes in specific glibc revisions. */
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+ if (name == NULL || strcmp (name, "clone2") == 0
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+ || strcmp ("__clone2", name) == 0)
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+ return (ia64_linux_clone2_running (this_frame) != 0);
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+
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+ return 0;
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+}
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+
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+static void
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+ia64_clone2_frame_this_id (struct frame_info *this_frame, void **this_cache,
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+ struct frame_id *this_id)
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+{
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+ /* Leave the default outermost frame at *THIS_ID. */
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+}
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+
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+static struct value *
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+ia64_clone2_frame_prev_register (struct frame_info *this_frame,
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+ void **this_cache, int regnum)
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+{
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+ return frame_unwind_got_register (this_frame, regnum, regnum);
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+}
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+
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+static int
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+ia64_clone2_frame_sniffer (const struct frame_unwind *self,
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+ struct frame_info *this_frame,
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+ void **this_prologue_cache)
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+{
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+ if (ia64_outermost_frame (this_frame))
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+ return 1;
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+
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+ return 0;
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+}
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+
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+static const struct frame_unwind ia64_clone2_frame_unwind =
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+{
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+ NORMAL_FRAME,
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+ &ia64_clone2_frame_this_id,
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+ &ia64_clone2_frame_prev_register,
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+ NULL,
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+ &ia64_clone2_frame_sniffer
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+};
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+
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/* Signal trampolines. */
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static void
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@@ -4023,6 +4155,7 @@ ia64_gdbarch_init (struct gdbarch_info i
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set_gdbarch_dummy_id (gdbarch, ia64_dummy_id);
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set_gdbarch_unwind_pc (gdbarch, ia64_unwind_pc);
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+ frame_unwind_append_unwinder (gdbarch, &ia64_clone2_frame_unwind);
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#ifdef HAVE_LIBUNWIND_IA64_H
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frame_unwind_append_unwinder (gdbarch,
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&ia64_libunwind_sigtramp_frame_unwind);
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Index: gdb-7.6.90.20140127/gdb/testsuite/gdb.threads/bt-clone-stop.c
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ gdb-7.6.90.20140127/gdb/testsuite/gdb.threads/bt-clone-stop.c 2014-02-04 23:43:33.050734976 +0100
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@@ -0,0 +1,39 @@
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+/* This testcase is part of GDB, the GNU debugger.
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+
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+ Copyright 2006 Free Software Foundation, Inc.
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 2 of the License, or
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+ (at your option) any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
|
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program; if not, write to the Free Software
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+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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+ MA 02110-1301, USA. */
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+
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+
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+#include <pthread.h>
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+#include <unistd.h>
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+#include <assert.h>
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+
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+
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+void *threader (void *arg)
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+{
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+ assert (0);
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+ return NULL;
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+}
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+
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+int main (void)
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+{
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+ pthread_t t1;
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+
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+ pthread_create (&t1, NULL, threader, (void *) NULL);
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+ for (;;)
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+ pause();
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+}
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Index: gdb-7.6.90.20140127/gdb/testsuite/gdb.threads/bt-clone-stop.exp
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ gdb-7.6.90.20140127/gdb/testsuite/gdb.threads/bt-clone-stop.exp 2014-02-04 23:43:33.050734976 +0100
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@@ -0,0 +1,61 @@
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+# Copyright 2006 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 2 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program; if not, write to the Free Software
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|
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
+
|
|
+# Backtraced `clone' must not have `PC == 0' as its previous frame.
|
|
+
|
|
+if $tracelevel then {
|
|
+ strace $tracelevel
|
|
+}
|
|
+
|
|
+set testfile bt-clone-stop
|
|
+set srcfile ${testfile}.c
|
|
+set binfile ${objdir}/${subdir}/${testfile}
|
|
+if { [gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
|
|
+ untested "Couldn't compile test program"
|
|
+ return -1
|
|
+}
|
|
+
|
|
+# Get things started.
|
|
+
|
|
+gdb_exit
|
|
+gdb_start
|
|
+gdb_reinitialize_dir $srcdir/$subdir
|
|
+gdb_load ${binfile}
|
|
+
|
|
+# threader: threader.c:8: threader: Assertion `0' failed.
|
|
+# Program received signal SIGABRT, Aborted.
|
|
+
|
|
+gdb_test "run" \
|
|
+ "Program received signal SIGABRT.*" \
|
|
+ "run"
|
|
+
|
|
+# Former gdb unwind (the first function is `clone'):
|
|
+# #5 0x0000003421ecd62d in ?? () from /lib64/libc.so.6
|
|
+# #6 0x0000000000000000 in ?? ()
|
|
+# (gdb)
|
|
+# Tested `amd64_linux_outermost_frame' functionality should omit the line `#6'.
|
|
+#
|
|
+# Two `-re' cases below must be in this order (1st is a subset of the 2nd one).
|
|
+# Unhandled case below should not happen and it is fortunately handled by
|
|
+# `amd64_linux_outermost_frame' as FAIL (and result `0x0 entry output invalid').
|
|
+gdb_test_multiple "bt" "0x0 entry output invalid" {
|
|
+ -re "in threader \\(.*\n#\[0-9\]* *0x0* in .*$gdb_prompt $" {
|
|
+ fail "0x0 entry found"
|
|
+ }
|
|
+ -re "in threader \\(.*$gdb_prompt $" {
|
|
+ pass "0x0 entry not found"
|
|
+ }
|
|
+}
|