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f58eaee1a1
PowerPC implements alternative instructions with __ftr_fixup and
__ftr_alt_* sections, for example net/core/dev.o:
Disassembly of section __ftr_alt_97:
0000000000000000 <__ftr_alt_97>:
0: 3c 00 40 7c pause_short
4: 3c 00 40 7c pause_short
8: 3c 00 40 7c pause_short
c: 3c 00 40 7c pause_short
Disassembly of section __ftr_fixup:
0000000000000000 <__ftr_fixup>:
0: 00 00 00 00 .long 0x0
4: 00 00 04 00 .long 0x40000
...
10: R_PPC64_REL64 .text.napi_busy_loop+0x1cc
18: R_PPC64_REL64 .text.napi_busy_loop+0x1dc
20: R_PPC64_REL64 __ftr_alt_97+0x20
28: R_PPC64_REL64 __ftr_alt_97+0x2c
34: 00 00 04 00 .long 0x40000
...
40: R_PPC64_REL64 .text.napi_busy_loop+0x3c0
48: R_PPC64_REL64 .text.napi_busy_loop+0x3d0
50: R_PPC64_REL64 __ftr_alt_97+0x24
58: R_PPC64_REL64 __ftr_alt_97+0x30
64: 00 00 04 00 .long 0x40000
...
70: R_PPC64_REL64 .text.napi_threaded_poll+0x170
78: R_PPC64_REL64 .text.napi_threaded_poll+0x180
80: R_PPC64_REL64 __ftr_alt_97+0x28
88: R_PPC64_REL64 __ftr_alt_97+0x34
94: 00 00 04 00 .long 0x40000
...
a0: R_PPC64_REL64 .text.net_rx_action+0x1a0
a8: R_PPC64_REL64 .text.net_rx_action+0x1b0
b0: R_PPC64_REL64 __ftr_alt_97+0x2c
b8: R_PPC64_REL64 __ftr_alt_97+0x38
Like .altinstr_{aux,replacement}, __ftr_alt sections don't have symbols
associated with them and may skip kpatch_replace_sections_syms()'s rela
mangling. As __ftr_fixup references __ftr_alt_* directly,
kpatch_process_special_sections() will already include __ftr_alt_* as
part of the "group" handling in kpatch_regenerate_special_section().
Reported-by: Zhijun Wang <zhijwang@redhat.com>
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
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|---|---|---|
| .. | ||
| gcc-plugins | ||
| insn | ||
| create-diff-object.c | ||
| create-klp-module.c | ||
| create-kpatch-module.c | ||
| kpatch-build | ||
| kpatch-cc | ||
| kpatch-elf.c | ||
| kpatch-elf.h | ||
| kpatch-intermediate.h | ||
| kpatch.h | ||
| list.h | ||
| log.h | ||
| lookup.c | ||
| lookup.h | ||
| Makefile | ||