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2be9880dc8
Only x86 has own release_thread(), introduce a new weak release_thread() function to clean empty definitions in other ARCHs. Link: https://lkml.kernel.org/r/20220819014406.32266-1-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Acked-by: Guo Ren <guoren@kernel.org> [csky] Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Brian Cain <bcain@quicinc.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc] Acked-by: Stafford Horne <shorne@gmail.com> [openrisc] Acked-by: Catalin Marinas <catalin.marinas@arm.com> [arm64] Acked-by: Huacai Chen <chenhuacai@kernel.org> [LoongArch] Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Chris Zankel <chris@zankel.net> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Guo Ren <guoren@kernel.org> [csky] Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Jonas Bonn <jonas@southpole.se> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Henderson <richard.henderson@linaro.org> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: Will Deacon <will@kernel.org> Cc: Xuerui Wang <kernel@xen0n.name> Cc: Yoshinori Sato <ysato@users.osdn.me> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
135 lines
3.0 KiB
C
135 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* arch/arm/include/asm/processor.h
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*
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* Copyright (C) 1995-1999 Russell King
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*/
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#ifndef __ASM_ARM_PROCESSOR_H
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#define __ASM_ARM_PROCESSOR_H
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#ifdef __KERNEL__
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#include <asm/hw_breakpoint.h>
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#include <asm/ptrace.h>
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#include <asm/types.h>
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#include <asm/unified.h>
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#include <asm/vdso/processor.h>
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#ifdef __KERNEL__
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#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
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TASK_SIZE : TASK_SIZE_26)
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#define STACK_TOP_MAX TASK_SIZE
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#endif
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struct debug_info {
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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struct perf_event *hbp[ARM_MAX_HBP_SLOTS];
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#endif
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};
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struct thread_struct {
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/* fault info */
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unsigned long address;
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unsigned long trap_no;
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unsigned long error_code;
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/* debugging */
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struct debug_info debug;
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};
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/*
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* Everything usercopied to/from thread_struct is statically-sized, so
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* no hardened usercopy whitelist is needed.
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*/
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static inline void arch_thread_struct_whitelist(unsigned long *offset,
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unsigned long *size)
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{
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*offset = *size = 0;
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}
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#define INIT_THREAD { }
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#define start_thread(regs,pc,sp) \
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({ \
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unsigned long r7, r8, r9; \
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\
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if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \
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r7 = regs->ARM_r7; \
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r8 = regs->ARM_r8; \
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r9 = regs->ARM_r9; \
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} \
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memset(regs->uregs, 0, sizeof(regs->uregs)); \
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if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \
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current->personality & FDPIC_FUNCPTRS) { \
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regs->ARM_r7 = r7; \
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regs->ARM_r8 = r8; \
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regs->ARM_r9 = r9; \
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regs->ARM_r10 = current->mm->start_data; \
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} else if (!IS_ENABLED(CONFIG_MMU)) \
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regs->ARM_r10 = current->mm->start_data; \
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if (current->personality & ADDR_LIMIT_32BIT) \
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regs->ARM_cpsr = USR_MODE; \
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else \
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regs->ARM_cpsr = USR26_MODE; \
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if (elf_hwcap & HWCAP_THUMB && pc & 1) \
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regs->ARM_cpsr |= PSR_T_BIT; \
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regs->ARM_cpsr |= PSR_ENDSTATE; \
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regs->ARM_pc = pc & ~1; /* pc */ \
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regs->ARM_sp = sp; /* sp */ \
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})
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/* Forward declaration, a strange C thing */
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struct task_struct;
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unsigned long __get_wchan(struct task_struct *p);
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#define task_pt_regs(p) \
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((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
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#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
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#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
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#ifdef CONFIG_SMP
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#define __ALT_SMP_ASM(smp, up) \
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"9998: " smp "\n" \
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" .pushsection \".alt.smp.init\", \"a\"\n" \
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" .align 2\n" \
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" .long 9998b - .\n" \
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" " up "\n" \
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" .popsection\n"
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#else
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#define __ALT_SMP_ASM(smp, up) up
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#endif
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/*
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* Prefetching support - only ARMv5.
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*/
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#if __LINUX_ARM_ARCH__ >= 5
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#define ARCH_HAS_PREFETCH
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static inline void prefetch(const void *ptr)
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{
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__asm__ __volatile__(
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"pld\t%a0"
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:: "p" (ptr));
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}
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#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
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#define ARCH_HAS_PREFETCHW
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static inline void prefetchw(const void *ptr)
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{
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__asm__ __volatile__(
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".arch_extension mp\n"
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__ALT_SMP_ASM(
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"pldw\t%a0",
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"pld\t%a0"
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)
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:: "p" (ptr));
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}
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#endif
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#endif
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#endif
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#endif /* __ASM_ARM_PROCESSOR_H */
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