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8c9c01ce69
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
29 lines
572 B
C
29 lines
572 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Part of fork context switch microbenchmark.
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*
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* Copyright 2018, Anton Blanchard, IBM Corp.
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*/
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#define _GNU_SOURCE
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#include <sys/syscall.h>
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void _start(void)
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{
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asm volatile (
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"li %%r0, %[sys_exit];"
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"li %%r3, 0;"
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"sc;"
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:
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: [sys_exit] "i" (SYS_exit)
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/*
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* "sc" will clobber r0, r3-r13, cr0, ctr, xer and memory.
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* Even though sys_exit never returns, handle clobber
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* registers.
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*/
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: "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
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"r11", "r12", "r13", "cr0", "ctr", "xer", "memory"
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);
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}
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