74 lines
2.8 KiB
Diff
74 lines
2.8 KiB
Diff
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http://sourceware.org/ml/gdb-patches/2011-08/msg00283.html
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Subject: [patch] TUI: Permit stepi on stripped code
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Hi,
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nick <cinolt> on #gdb@freenode complained one cannot stepi on stripped binary.
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echo -e '#include<unistd.h>\nint main(void){return alarm(0);}'|gcc -Wall -s -x c -;./gdbtui ./a.out -nx -ex 'layout asm' -ex 'b alarm' -ex r -ex fini
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will:
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0x7ffff7ae25c0 <alarm> mov $0x25,%eax
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-------------------------------------------------
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(gdb) p/x $pc
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$1 = 0x4004d2
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(gdb) stepi
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No function contains program counter for selected frame.
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(gdb) p/x $pc
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$2 = 0x4004d2
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That is the window still displays stale content, stepi does not work at all.
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#0 throw_verror (error=GENERIC_ERROR, fmt=0xe73d20 "No function contains program counter for selected frame.", ap=0x7fffdbd3b0a8) at exceptions.c:400
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#1 in error (string=0xe73d20 "No function contains program counter for selected frame.") at utils.c:780
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#2 in tui_show_frame_info (fi=0x3eca1e0) at ./tui/tui-stack.c:383
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#3 in tui_selected_frame_level_changed_hook (level=0) at ./tui/tui-hooks.c:218
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#4 in select_frame (fi=0x3eca1e0) at frame.c:1396
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#5 in restore_selected_frame (a_frame_id=..., frame_level=0) at thread.c:1049
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#6 in do_restore_current_thread_cleanup (arg=0x456dca0) at thread.c:1116
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#7 in do_my_cleanups (pmy_chain=0x1c865f0, old_chain=0x456de90) at utils.c:515
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#8 in do_cleanups (old_chain=0x456de90) at utils.c:497
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#9 in insert_breakpoint_locations () at breakpoint.c:2021
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#10 in insert_breakpoints () at breakpoint.c:1919
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#11 in proceed (addr=18446744073709551615, siggnal=TARGET_SIGNAL_DEFAULT, step=1) at infrun.c:2156
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#12 in step_once (skip_subroutines=0, single_inst=1, count=1, thread=-1) at infcmd.c:1068
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#13 in step_1 (skip_subroutines=0, single_inst=1, count_string=0x0) at infcmd.c:903
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#14 in stepi_command (count_string=0x0, from_tty=1) at infcmd.c:839
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With the fix stepi works and the window correctly displays:
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0x4004d2 pop %rbp
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-------------------------------------------------
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I haven't found any TUI testsuite.
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I will check it in (after regression testing(?)) in some time.
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Thanks,
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Jan
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gdb/
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2011-08-14 Jan Kratochvil <jan.kratochvil@redhat.com>
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Fix TUI stepi on code without symbols.
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* tui/tui-stack.c (tui_show_frame_info): Remove error, set LOW for
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current PC instead.
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--- a/gdb/tui/tui-stack.c
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+++ b/gdb/tui/tui-stack.c
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@@ -380,8 +380,11 @@ tui_show_frame_info (struct frame_info *fi)
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{
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if (find_pc_partial_function (get_frame_pc (fi), (char **) NULL,
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&low, (CORE_ADDR) 0) == 0)
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- error (_("No function contains program "
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- "counter for selected frame."));
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+ {
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+ /* There is no symbol available for current PC. There is no
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+ safe way how to "disassemble backwards". */
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+ low = get_frame_pc (fi);
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+ }
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else
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low = tui_get_low_disassembly_address (get_frame_arch (fi),
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low, get_frame_pc (fi));
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