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old-cross-binutils/gdb/testsuite/gdb.arch/amd64-prologue-skip.S

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Do not skip prologue for asm (.S) files GDB tries to skip prologue for .S files according to .debug_line but it then places the breakpoint to a location where it is never hit. This is because #defines in .S files cause prologue skipping which is completely inappropriate, for s390x: glibc/sysdeps/unix/syscall-template.S 78:/* This is a "normal" system call stub: if there is an error, 79: it returns -1 and sets errno. */ 80: 81:T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS) 82: ret 00000000000f4210 T __select Line Number Statements: Extended opcode 2: set Address to 0xf41c8 Advance Line by 80 to 81 Copy Advance PC by 102 to 0xf422e Special opcode 6: advance Address by 0 to 0xf422e and Line by 1 to 82 Special opcode 34: advance Address by 2 to 0xf4230 and Line by 1 to 83 Advance PC by 38 to 0xf4256 Extended opcode 1: End of Sequence Compilation Unit @ offset 0x28b3e0: <0><28b3eb>: Abbrev Number: 1 (DW_TAG_compile_unit) <28b3ec> DW_AT_stmt_list : 0x7b439 <28b3f0> DW_AT_low_pc : 0xf41c8 <28b3f8> DW_AT_high_pc : 0xf4256 <28b400> DW_AT_name : ../sysdeps/unix/syscall-template.S <28b423> DW_AT_comp_dir : /usr/src/debug////////glibc-2.17-c758a686/misc <28b452> DW_AT_producer : GNU AS 2.23.52.0.1 <28b465> DW_AT_language : 32769 (MIPS assembler) without debuginfo or with debuginfo and the fix - correct address: (gdb) b select Breakpoint 1 at 0xf4210 It is also where .dynsym+.symtab point to: 00000000000f4210 T __select 00000000000f4210 W select with debuginfo, without the fix: (gdb) b select Breakpoint 1 at 0xf41c8: file ../sysdeps/unix/syscall-template.S, line 81. One part is to behave for asm files similar way like for 'locations_valid': /* Symtab has been compiled with both optimizations and debug info so that GDB may stop skipping prologues as variables locations are valid already at function entry points. */ unsigned int locations_valid : 1; The other part is to extend the 'locations_valid'-like functionality more. Both minsym_found and find_function_start_sal need to be patched, otherwise their addresses do not match and GDB regresses on ppc64: gdb/ChangeLog 2015-06-26 Jan Kratochvil <jan.kratochvil@redhat.com> * linespec.c (minsym_found): Reset sal.PC for COMPUNIT_LOCATIONS_VALID and language_asm.. * symtab.c (find_function_start_sal): Likewise. gdb/testsuite/ChangeLog 2015-06-26 Jan Kratochvil <jan.kratochvil@redhat.com> * gdb.arch/amd64-prologue-skip.S: New file. * gdb.arch/amd64-prologue-skip.exp: New file.
2015-06-26 13:11:14 +00:00
/* This testcase is part of GDB, the GNU debugger.
GDB copyright headers update after running GDB's copyright.py script. gdb/ChangeLog: Update year range in copyright notice of all files.
2016-01-01 04:33:14 +00:00
Copyright 2015-2016 Free Software Foundation, Inc.
Do not skip prologue for asm (.S) files GDB tries to skip prologue for .S files according to .debug_line but it then places the breakpoint to a location where it is never hit. This is because #defines in .S files cause prologue skipping which is completely inappropriate, for s390x: glibc/sysdeps/unix/syscall-template.S 78:/* This is a "normal" system call stub: if there is an error, 79: it returns -1 and sets errno. */ 80: 81:T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS) 82: ret 00000000000f4210 T __select Line Number Statements: Extended opcode 2: set Address to 0xf41c8 Advance Line by 80 to 81 Copy Advance PC by 102 to 0xf422e Special opcode 6: advance Address by 0 to 0xf422e and Line by 1 to 82 Special opcode 34: advance Address by 2 to 0xf4230 and Line by 1 to 83 Advance PC by 38 to 0xf4256 Extended opcode 1: End of Sequence Compilation Unit @ offset 0x28b3e0: <0><28b3eb>: Abbrev Number: 1 (DW_TAG_compile_unit) <28b3ec> DW_AT_stmt_list : 0x7b439 <28b3f0> DW_AT_low_pc : 0xf41c8 <28b3f8> DW_AT_high_pc : 0xf4256 <28b400> DW_AT_name : ../sysdeps/unix/syscall-template.S <28b423> DW_AT_comp_dir : /usr/src/debug////////glibc-2.17-c758a686/misc <28b452> DW_AT_producer : GNU AS 2.23.52.0.1 <28b465> DW_AT_language : 32769 (MIPS assembler) without debuginfo or with debuginfo and the fix - correct address: (gdb) b select Breakpoint 1 at 0xf4210 It is also where .dynsym+.symtab point to: 00000000000f4210 T __select 00000000000f4210 W select with debuginfo, without the fix: (gdb) b select Breakpoint 1 at 0xf41c8: file ../sysdeps/unix/syscall-template.S, line 81. One part is to behave for asm files similar way like for 'locations_valid': /* Symtab has been compiled with both optimizations and debug info so that GDB may stop skipping prologues as variables locations are valid already at function entry points. */ unsigned int locations_valid : 1; The other part is to extend the 'locations_valid'-like functionality more. Both minsym_found and find_function_start_sal need to be patched, otherwise their addresses do not match and GDB regresses on ppc64: gdb/ChangeLog 2015-06-26 Jan Kratochvil <jan.kratochvil@redhat.com> * linespec.c (minsym_found): Reset sal.PC for COMPUNIT_LOCATIONS_VALID and language_asm.. * symtab.c (find_function_start_sal): Likewise. gdb/testsuite/ChangeLog 2015-06-26 Jan Kratochvil <jan.kratochvil@redhat.com> * gdb.arch/amd64-prologue-skip.S: New file. * gdb.arch/amd64-prologue-skip.exp: New file.
2015-06-26 13:11:14 +00:00
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
.text
/*0*/ hlt
pushrbp: .globl pushrbp
#define PUSHRBP push %rbp; mov %rsp, %rbp; nop
/*1*/ PUSHRBP
/*6*/ hlt
/*7*/ hlt
#define MINSYM nop; .globl minsym; minsym: nop
/*8*/ MINSYM
/*a*/ hlt
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