On Mon, 6 Jan 2020, Martin Liška wrote:
> You are right, we do not leverage multi-byte NOPs. Note that the support
> depends
> on a CPU model (-march) and the similar code is quite complex in binutils:
> https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob;f=gas/config/tc-i386.c;h=d0b8f
On 1/4/20 9:48 PM, Fangrui Song wrote:
-fpatchable-function-entry is used by Linux kernel arm64/parisc. The
feature works for x86, but does not leverage multi-byte NOP.
% cat a.c
int foo() { return 0; }
% gcc -fpatchable-function-entry=5,0 -c a.c
% objdump -d a.o
...
:
0:
On 2020-01-04, Fangrui Song wrote:
-fpatchable-function-entry is used by Linux kernel arm64/parisc. The
feature works for x86, but does not leverage multi-byte NOP.
% cat a.c
int foo() { return 0; }
% gcc -fpatchable-function-entry=5,0 -c a.c
% objdump -d a.o
...
:
0: 90
-fpatchable-function-entry is used by Linux kernel arm64/parisc. The
feature works for x86, but does not leverage multi-byte NOP.
% cat a.c
int foo() { return 0; }
% gcc -fpatchable-function-entry=5,0 -c a.c
% objdump -d a.o
...
:
0: 90 nop
1: 90
