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2015-01-01Update year range in copyright notice of all files owned by the GDB project.Joel Brobecker1-1/+1
gdb/ChangeLog: Update year range in copyright notice of all files.
2014-12-02execl-update-breakpoints.exp: Move whole segment instead of .text sectionAndreas Arnez1-8/+22
The test case builds two copies of the program, one with the compile option "ldflags=-Wl,-Ttext=0x1000000" and the other with the address changed to 0x2000000. However, when linking with ld.bfd, the resulting executables crash early in ld.so on S390 and i386. Analysis of the crash: The default linker script establishes a certain order of loadable sections, and the option "-Ttext" effectively splits these into an "unaffected" lot (everything before .text) and an "affected" lot. The affected lot is placed at the given address, whereas the unaffected lot stays at its default address. The unaffected lot starts at an aligned address plus Elf header sizes, which is good if it is the first LOAD segment (like on AMD64). But if the affected lot comes first instead (like on S390 and i386), the PHDR doesn't fit there and is placed *outside* any LOAD segments. Then the PHDR is not mapped when the loader gets control, and the loader runs into a segmentation fault while trying to access it. Since we are lucky about the order of segments on AMD64, the test succeeds there, but the resulting binaries are unusually large -- 2.1M each, with lots of padding within. When replacing '-Ttext' by '-Ttext-segment', the linker moves all segments consistently, the binaries have normal sizes, and the test case succeeds on all mentioned platforms. Since old versions of the gold linker don't support '-Ttext-segment', the patch also adds logic for falling back to '-Ttext'. gdb/testsuite/ChangeLog: * gdb.base/execl-update-breakpoints.exp: Specify the link address with '-Ttext-segment' instead of '-Ttext'. Fall back to '-Ttext' if the linker doesn't understand this.
2014-10-02PR17431: following execs with "breakpoint always-inserted on"Pedro Alves1-0/+114
Following an exec with "breakpoint always-inserted on" tries to insert breakpoints in the new image at the addresses the symbols had in the old image. With "always-inserted off", we see: gdb gdb.multi/multi-arch-exec -ex "set breakpoint always-inserted off" GNU gdb (GDB) 7.8.50.20140924-cvs ... (gdb) b main Breakpoint 1 at 0x400664: file gdb.multi/multi-arch-exec.c, line 24. ^^^^^^^^ (gdb) c The program is not being run. (gdb) r Starting program: testsuite/gdb.multi/multi-arch-exec Breakpoint 1, main () at gdb/testsuite/gdb.multi/multi-arch-exec.c:24 24 execl (BASEDIR "/multi-arch-exec-hello", (gdb) c Continuing. process 9212 is executing new program: gdb/testsuite/gdb.multi/multi-arch-exec-hello Breakpoint 1, main () at gdb/testsuite/gdb.multi/hello.c:40 40 bar(); (gdb) info breakpoints Num Type Disp Enb Address What 1 breakpoint keep y 0x080484e4 in main at gdb/testsuite/gdb.multi/hello.c:40 ^^^^^^^^^^ breakpoint already hit 2 times (gdb) Note how main was 0x400664 in multi-arch-exec, and 0x080484e4 in gdb.multi/hello. With "always-inserted on", we get: Breakpoint 1, main () at gdb/testsuite/gdb.multi/multi-arch-exec.c:24 24 execl (BASEDIR "/multi-arch-exec-hello", (gdb) c Continuing. infrun: target_wait (-1, status) = infrun: 9444 [process 9444], infrun: status->kind = execd infrun: infwait_normal_state infrun: TARGET_WAITKIND_EXECD Warning: Cannot insert breakpoint 1. Cannot access memory at address 0x400664 (gdb) That is, GDB is trying to insert a breakpoint at 0x400664, after the exec, and then that address happens to not be mapped at all in the new image. The problem is that update_breakpoints_after_exec is creating breakpoints, which ends up in update_global_location_list immediately inserting breakpoints if "breakpoints always-inserted" is "on". update_breakpoints_after_exec is called very early when we see an exec event. At that point, we haven't loaded the symbols of the new post-exec image yet, and thus haven't reset breakpoint's addresses to whatever they may be in the new image. All we should be doing in update_breakpoints_after_exec is deleting breakpoints that no longer make sense after an exec. So the fix removes those breakpoint creations. The question is then, if not here, where are those breakpoints re-created? Turns out we don't need to do anything else, because at the end of follow_exec, we call breakpoint_re_set, whose tail is also creating exactly the same breakpoints update_breakpoints_after_exec is currently creating: breakpoint_re_set (void) { ... create_overlay_event_breakpoint (); create_longjmp_master_breakpoint (); create_std_terminate_master_breakpoint (); create_exception_master_breakpoint (); } A new test is added to exercise this. Tested on x86_64 Fedora 20. gdb/ 2014-10-02 Pedro Alves <palves@redhat.com> PR breakpoints/17431 * breakpoint.c (update_breakpoints_after_exec): Don't create overlay, longjmp, std terminate nor exception breakpoints here. gdb/testsuite/ 2014-10-02 Pedro Alves <palves@redhat.com> PR breakpoints/17431 * gdb.base/execl-update-breakpoints.c: New file. * gdb.base/execl-update-breakpoints.exp: New file.