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selftests/powerpc: Allow building without static libc

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Currently exec-target.c is linked statically with libc, which on Fedora
at least requires installing an additional package (glibc-static).

If that package is not installed the build fails with:

    CC       exec_target
  /usr/bin/ld: cannot find -lc: No such file or directory
  collect2: error: ld returned 1 exit status

All exec_target.c does is call sys_exit, which can be done easily enough
using inline assembly, and removes the requirement for a static libc to
be installed.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240812094152.418586-1-maddy@linux.ibm.com
This commit is contained in:
Madhavan Srinivasan 2024-08-12 15:11:52 +05:30 • committed by Michael Ellerman
parent a5a670df1d
commit 8c9c01ce69
2 changed files with 15 additions and 3 deletions
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2
tools/testing/selftests/powerpc/benchmarks/Makefile
View file

@ -18,4 +18,4 @@ $(OUTPUT)/context_switch: LDLIBS += -lpthread
$(OUTPUT)/fork: LDLIBS += -lpthread
$(OUTPUT)/exec_target: CFLAGS += -static -nostartfiles
$(OUTPUT)/exec_target: CFLAGS += -nostartfiles

16
tools/testing/selftests/powerpc/benchmarks/exec_target.c
View file

@ -7,10 +7,22 @@
*/
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
void _start(void)
{
syscall(SYS_exit, 0);
asm volatile (
"li %%r0, %[sys_exit];"
"li %%r3, 0;"
"sc;"
:
: [sys_exit] "i" (SYS_exit)
/*
* "sc" will clobber r0, r3-r13, cr0, ctr, xer and memory.
* Even though sys_exit never returns, handle clobber
* registers.
*/
: "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
"r11", "r12", "r13", "cr0", "ctr", "xer", "memory"
);
}