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loongarch: add glibc start.S to make zig-bootstrap work for loongarch64-linux-gnu (#21015)
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‎lib/libc/glibc/sysdeps/loongarch/bits/endianness.h

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#ifndef _BITS_ENDIANNESS_H
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#define _BITS_ENDIANNESS_H 1
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#ifndef _BITS_ENDIAN_H
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#error "Never use <bits/endianness.h> directly; include <endian.h> instead."
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#endif
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/* LoongArch is little-endian. */
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#define __BYTE_ORDER __LITTLE_ENDIAN
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#endif /* bits/endianness.h */

‎lib/libc/glibc/sysdeps/loongarch/start.S

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/* Startup code compliant to the ELF LoongArch ABI.
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Copyright (C) 2022-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define __ASSEMBLY__ 1
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#include <entry.h>
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#include <sys/asm.h>
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/* The entry point's job is to call __libc_start_main. Per the ABI,
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a0 contains the address of a function to be passed to atexit.
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__libc_start_main wants this in a5. */
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/*
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int
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__libc_start_main (int (*main) (int, char **, char **),
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int argc,
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char **argv,
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__typeof (main) init,
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void (*fini) (void),
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void (*rtld_fini) (void),
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void *stack_end);
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*/
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ENTRY (ENTRY_POINT)
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/* Terminate call stack by noting ra is undefined. Use a dummy
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.cfi_label to force starting the FDE. */
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.cfi_label .Ldummy
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cfi_undefined (1)
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or a5, a0, zero /* rtld_fini */
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la.pcrel a0, t0, main
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REG_L a1, sp, 0
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ADDI a2, sp, SZREG
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/* Adjust $sp for 16-aligned */
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BSTRINS sp, zero, 3, 0
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move a3, zero /* used to be init */
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move a4, zero /* used to be fini */
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or a6, sp, zero /* stack_end */
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la.pcrel ra, t0, __libc_start_main
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jirl ra, ra, 0
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la.pcrel ra, t0, abort
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jirl ra, ra, 0
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END (ENTRY_POINT)

‎lib/libc/glibc/sysdeps/loongarch/sys/regdef.h

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/* Register Macro definitions
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Copyright (C) 2022-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _SYS_REGDEF_H
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#define _SYS_REGDEF_H
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#define zero $r0
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#define ra $r1
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#define tp $r2
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#define sp $r3
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#define a0 $r4
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#define a1 $r5
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#define a2 $r6
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#define a3 $r7
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#define a4 $r8
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#define a5 $r9
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#define a6 $r10
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#define a7 $r11
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#define v0 $r4
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#define v1 $r5
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#define t0 $r12
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#define t1 $r13
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#define t2 $r14
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#define t3 $r15
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#define t4 $r16
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#define t5 $r17
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#define t6 $r18
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#define t7 $r19
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#define t8 $r20
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#define x $r21
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#define fp $r22
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#define s0 $r23
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#define s1 $r24
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#define s2 $r25
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#define s3 $r26
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#define s4 $r27
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#define s5 $r28
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#define s6 $r29
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#define s7 $r30
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#define s8 $r31
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#define fa0 $f0
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#define fa1 $f1
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#define fa2 $f2
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#define fa3 $f3
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#define fa4 $f4
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#define fa5 $f5
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#define fa6 $f6
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#define fa7 $f7
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#define fv0 $f0
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#define fv1 $f1
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#define ft0 $f8
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#define ft1 $f9
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#define ft2 $f10
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#define ft3 $f11
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#define ft4 $f12
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#define ft5 $f13
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#define ft6 $f14
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#define ft7 $f15
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#define ft8 $f16
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#define ft9 $f17
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#define ft10 $f18
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#define ft11 $f19
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#define ft12 $f20
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#define ft13 $f21
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#define ft14 $f22
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#define ft15 $f23
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#define fs0 $f24
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#define fs1 $f25
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#define fs2 $f26
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#define fs3 $f27
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#define fs4 $f28
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#define fs5 $f29
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#define fs6 $f30
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#define fs7 $f31
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#define fcc0 $fcc0
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#define fcc1 $fcc1
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#define fcc2 $fcc2
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#define fcc3 $fcc3
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#define fcc4 $fcc4
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#define fcc5 $fcc5
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#define fcc6 $fcc6
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#define fcc7 $fcc7
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#define fcsr0 $fcsr0
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#define vr0 $vr0
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#define vr1 $vr1
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#define vr2 $vr2
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#define vr3 $vr3
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#define vr4 $vr4
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#define vr5 $vr5
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#define vr6 $vr6
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#define vr7 $vr7
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#define vr8 $vr8
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#define vr9 $vr9
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#define vr10 $vr10
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#define vr11 $vr11
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#define vr12 $vr12
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#define vr13 $vr13
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#define vr14 $vr14
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#define vr15 $vr15
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#define vr16 $vr16
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#define vr17 $vr17
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#define vr18 $vr18
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#define vr19 $vr19
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#define vr20 $vr20
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#define vr21 $vr21
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#define vr22 $vr22
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#define vr23 $vr23
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#define vr24 $vr24
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#define vr25 $vr25
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#define vr26 $vr26
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#define vr27 $vr27
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#define vr28 $vr28
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#define vr29 $vr29
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#define vr30 $vr30
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#define vr31 $vr31
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#define xr0 $xr0
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#define xr1 $xr1
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#define xr2 $xr2
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#define xr3 $xr3
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#define xr4 $xr4
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#define xr5 $xr5
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#define xr6 $xr6
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#define xr7 $xr7
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#define xr7 $xr7
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#define xr8 $xr8
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#define xr9 $xr9
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#define xr10 $xr10
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#define xr11 $xr11
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#define xr12 $xr12
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#define xr13 $xr13
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#define xr14 $xr14
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#define xr15 $xr15
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#define xr16 $xr16
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#define xr17 $xr17
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#define xr18 $xr18
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#define xr19 $xr19
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#define xr20 $xr20
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#define xr21 $xr21
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#define xr22 $xr22
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#define xr23 $xr23
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#define xr24 $xr24
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#define xr25 $xr25
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#define xr26 $xr26
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#define xr27 $xr27
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#define xr28 $xr28
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#define xr29 $xr29
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#define xr30 $xr30
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#define xr31 $xr31
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#endif /* _SYS_REGDEF_H */

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