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samples/ftrace: Fix asm function ELF annotations

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Enable objtool coverage for the sample ftrace modules by adding ELF
annotations to the asm trampoline functions.

  samples/ftrace/ftrace-direct.o: warning: objtool: .text+0x0: unreachable instruction
  samples/ftrace/ftrace-direct-modify.o: warning: objtool: .text+0x0: unreachable instruction
  samples/ftrace/ftrace-direct-too.o: warning: objtool: .text+0x0: unreachable instruction

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
This commit is contained in:
Josh Poimboeuf 2020-04-24 15:40:43 -05:00
parent 7c0577f4e6
commit 9d907f1ae8
3 changed files with 8 additions and 0 deletions
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4
samples/ftrace/ftrace-direct-modify.c
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@ -20,18 +20,22 @@ static unsigned long my_ip = (unsigned long)schedule;
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp1, @function\n"
" my_tramp1:"
" pushq %rbp\n"
" movq %rsp, %rbp\n"
" call my_direct_func1\n"
" leave\n"
" .size my_tramp1, .-my_tramp1\n"
" ret\n"
" .type my_tramp2, @function\n"
" my_tramp2:"
" pushq %rbp\n"
" movq %rsp, %rbp\n"
" call my_direct_func2\n"
" leave\n"
" ret\n"
" .size my_tramp2, .-my_tramp2\n"
" .popsection\n"
);

2
samples/ftrace/ftrace-direct-too.c
View File

@ -15,6 +15,7 @@ extern void my_tramp(void *);
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp, @function\n"
" my_tramp:"
" pushq %rbp\n"
" movq %rsp, %rbp\n"
@ -27,6 +28,7 @@ asm (
" popq %rdi\n"
" leave\n"
" ret\n"
" .size my_tramp, .-my_tramp\n"
" .popsection\n"
);

2
samples/ftrace/ftrace-direct.c
View File

@ -13,6 +13,7 @@ extern void my_tramp(void *);
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp, @function\n"
" my_tramp:"
" pushq %rbp\n"
" movq %rsp, %rbp\n"
@ -21,6 +22,7 @@ asm (
" popq %rdi\n"
" leave\n"
" ret\n"
" .size my_tramp, .-my_tramp\n"
" .popsection\n"
);