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724c8a23d5
When objtool encounters the stack-swizzle:
mov %rsp, (%[tos])
mov %[tos], %rsp
...
pop %rsp
Inside a FRAME_POINTER=y build, things go a little screwy because
clearly we're not adjusting the cfa->base. This then results in the
pop %rsp not being detected as a restore of cfa->base so it will turn
into a regular POP and offset the stack, resulting in:
kernel/softirq.o: warning: objtool: do_softirq()+0xdb: return with modified stack frame
Therefore, have "mov %[tos], %rsp" act like a PUSH (it sorta is
anyway) to balance the things out. We're not too concerned with the
actual stack_size for frame-pointer builds, since we don't generate
ORC data for them anyway.
Fixes:
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.. | ||
arch/x86 | ||
Documentation | ||
include/objtool | ||
.gitignore | ||
Build | ||
builtin-check.c | ||
builtin-orc.c | ||
check.c | ||
elf.c | ||
Makefile | ||
objtool.c | ||
orc_dump.c | ||
orc_gen.c | ||
special.c | ||
sync-check.sh | ||
weak.c |