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02217ad447
Add support for SuperH/"sh" to nolibc. Only sh4 is tested for now. The startup code is special: __nolibc_entrypoint_epilogue() calls __builtin_unreachable() which emits a call to abort(). To make this work a function prologue is generated to set up a GOT pointer which corrupts "sp". __builtin_unreachable() is necessary for __attribute__((noreturn)). Also depending on compiler flags (for example -fPIC) even more prologue is generated. Work around this by defining a nested function in asm. Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70216 Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Acked-by: Rob Landley <rob@landley.net> Acked-by: D. Jeff Dionne <jeff@coresemi.io> Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Link: https://lore.kernel.org/r/20250623-nolibc-sh-v2-3-0f5b4b303025@weissschuh.net
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* Copyright (C) 2017-2022 Willy Tarreau <w@1wt.eu>
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*/
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/* Below comes the architecture-specific code. For each architecture, we have
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* the syscall declarations and the _start code definition. This is the only
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* global part. On all architectures the kernel puts everything in the stack
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* before jumping to _start just above us, without any return address (_start
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* is not a function but an entry point). So at the stack pointer we find argc.
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* Then argv[] begins, and ends at the first NULL. Then we have envp which
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* starts and ends with a NULL as well. So envp=argv+argc+1.
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*/
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#ifndef _NOLIBC_ARCH_H
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#define _NOLIBC_ARCH_H
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#if defined(__x86_64__) || defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__)
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#include "arch-x86.h"
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#elif defined(__ARM_EABI__)
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#include "arch-arm.h"
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#elif defined(__aarch64__)
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#include "arch-arm64.h"
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#elif defined(__mips__)
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#include "arch-mips.h"
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#elif defined(__powerpc__)
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#include "arch-powerpc.h"
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#elif defined(__riscv)
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#include "arch-riscv.h"
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#elif defined(__s390x__) || defined(__s390__)
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#include "arch-s390.h"
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#elif defined(__loongarch__)
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#include "arch-loongarch.h"
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#elif defined(__sparc__)
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#include "arch-sparc.h"
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#elif defined(__m68k__)
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#include "arch-m68k.h"
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#elif defined(__sh__)
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#include "arch-sh.h"
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#else
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#error Unsupported Architecture
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#endif
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#endif /* _NOLIBC_ARCH_H */
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