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From: U-FRANFrancisco <Francisco@nc.rr.com> To: gcc-gnats@gcc.gnu.org Subject: debug/6434: Thumb compilation yields no DWARF FDE instructions Date: Wed, 24 Apr 2002 04:56:00 -0000 [thread overview] Message-ID: <0e8ab2847111842FE8@mail8.nc.rr.com> (raw) >Number: 6434 >Category: debug >Synopsis: Thumb compilation produces no DWARF FDE instructions >Confidential: no >Severity: non-critical >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Wed Apr 24 04:56:02 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Francisco >Release: 3.0.4 (DevKit-Advance) >Organization: Personal >Environment: System: CYGWIN_NT-5.1 FRAN 1.3.10(0.51/3/2) 2002-02-25 11:14 i686 unknown host: i686-pc-cygwin build: i686-pc-cygwin target: arm-agb-elf configured with: ../gcc-3.0.4/configure --prefix=/devkitadv --build=i686-pc-cygwin --host=i686-pc-cygwin --target=arm-agb-elf --with-cpu=arm7tdmi --without-local-prefix --with-newlib --with-headers=../newlib-1.10.0/newlib/libc/include/ --enable-multilib --enable-interwork --enable-languages=c++ --enable-targets=arm-elf,arm-coff,arm-aout --disable-win32-registry --disable-threads -v >Description: Code compiled with -marm correctly produces DWARF call frame instructions. Example: 00000608 00000020 0000034c FDE cie=0000034c pc=02001634..020016a0 DW_CFA_advance_loc: 4 to 02001638 DW_CFA_def_cfa_reg: r12 DW_CFA_advance_loc: 4 to 0200163c DW_CFA_offset: r14 at cfa-8 DW_CFA_offset: r13 at cfa-12 DW_CFA_offset: r11 at cfa-16 DW_CFA_advance_loc4: 4 to 02001640 DW_CFA_def_cfa: r11 ofs 4 DW_CFA_nop DW_CFA_nop Code compiled with -mthumb doesn't contain any call frame instructions. Example: 0000063c 0000000c 0000062c FDE cie=0000062c pc=020016a0..020017a8 >How-To-Repeat: Compile the following simple example: void a() { } void main(int argc, char **argv) { a(); } Compile with -marm: gcc -c -marm -o test.o test.c Check output with readelf -w and look at the .debug_frame section Output correctly includes CFA instructions. Now compile with -mthumb: gcc -c -mthumb -o test.o test.c Check output with readelf -w and look at the .debug_frame section Output is missing CFA instructions preventing a debugger to show call frame information. >Fix: Unknown. >Release-Note: >Audit-Trail: >Unformatted:
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