Peter Zijlstra d139bca4b8 objtool: Fix IBT tail-call detection ... Objtool reports: arch/x86/crypto/poly1305-x86_64.o: warning: objtool: poly1305_blocks_avx() falls through to next function poly1305_blocks_x86_64() arch/x86/crypto/poly1305-x86_64.o: warning: objtool: poly1305_emit_avx() falls through to next function poly1305_emit_x86_64() arch/x86/crypto/poly1305-x86_64.o: warning: objtool: poly1305_blocks_avx2() falls through to next function poly1305_blocks_x86_64() Which reads like: 0000000000000040 <poly1305_blocks_x86_64>: 40: f3 0f 1e fa endbr64 ... 0000000000000400 <poly1305_blocks_avx>: 400: f3 0f 1e fa endbr64 404: 44 8b 47 14 mov 0x14(%rdi),%r8d 408: 48 81 fa 80 00 00 00 cmp $0x80,%rdx 40f: 73 09 jae 41a <poly1305_blocks_avx+0x1a> 411: 45 85 c0 test %r8d,%r8d 414: 0f 84 2a fc ff ff je 44 <poly1305_blocks_x86_64+0x4> ... These are simple conditional tail-calls and *should* be recognised as such by objtool, however due to a mistake in commit 08f87a93c8 ("objtool: Validate IBT assumptions") this is failing. Specifically, the jump_dest is +4, this means the instruction pointed at will not be ENDBR and as such it will fail the second clause of is_first_func_insn() that was supposed to capture this exact case. Instead, have is_first_func_insn() look at the previous instruction. Fixes: 08f87a93c8 ("objtool: Validate IBT assumptions") Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20220322115125.811582125@infradead.org		2022-04-05 10:24:40 +02:00
..
accounting	delayacct: track delays from memory compact	2022-01-20 08:52:55 +02:00
arch	tools headers cpufeatures: Sync with the kernel sources	2022-04-01 16:19:35 -03:00
bootconfig
bpf	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
build	kbuild: replace $(if A,A,B) with $(or A,B)	2022-02-15 12:25:56 +09:00
cgroup	tools/cgroup/slabinfo: update to work with struct slab	2022-02-21 11:34:49 +01:00
counter	kbuild: replace $(if A,A,B) with $(or A,B)	2022-02-15 12:25:56 +09:00
debugging
edid
firewire
firmware
gpio	kbuild: replace $(if A,A,B) with $(or A,B)	2022-02-15 12:25:56 +09:00
hv	kbuild: replace $(if A,A,B) with $(or A,B)	2022-02-15 12:25:56 +09:00
iio	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
include	tools headers UAPI: Sync drm/i915_drm.h with the kernel sources	2022-04-01 16:19:35 -03:00
io_uring
kvm/kvm_stat
laptop
leds
lib	perf cpumap: More cpu map reuse by merge.	2022-04-01 16:19:35 -03:00
memory-model	tools/memory-model: Explain syntactic and semantic dependencies	2022-02-01 17:32:30 -08:00
objtool	objtool: Fix IBT tail-call detection	2022-04-05 10:24:40 +02:00
pci	kbuild: replace $(if A,A,B) with $(or A,B)	2022-02-15 12:25:56 +09:00
pcmcia
perf	perf python: Convert tracepoint.py example to python3	2022-04-01 16:19:35 -03:00
power	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
rcu
scripts	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
spi	kbuild: replace $(if A,A,B) with $(or A,B)	2022-02-15 12:25:56 +09:00
testing	A set of x86 fixes and updates:	2022-04-03 12:15:47 -07:00
thermal/tmon	thermal: tools: tmon: remove unneeded local variable	2021-11-24 17:26:13 +01:00
time
tracing	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
usb	kbuild: replace $(if A,A,B) with $(or A,B)	2022-02-15 12:25:56 +09:00
virtio	tools/virtio: compile with -pthread	2022-03-28 16:52:59 -04:00
vm	tools/vm/page_owner_sort.c: remove -c option	2022-04-01 11:46:09 -07:00
wmi
Makefile