| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Vineet Gupta | 653 | 82.97% | 14 | 51.85% |
| Peter Zijlstra | 109 | 13.85% | 1 | 3.70% |
| Ingo Molnar | 6 | 0.76% | 2 | 7.41% |
| Jens Axboe | 4 | 0.51% | 1 | 3.70% |
| Bhaskar Chowdhury | 4 | 0.51% | 1 | 3.70% |
| Thomas Gleixner | 3 | 0.38% | 2 | 7.41% |
| Michel Lespinasse | 2 | 0.25% | 1 | 3.70% |
| Alex Dowad | 2 | 0.25% | 1 | 3.70% |
| Noam Camus | 1 | 0.13% | 1 | 3.70% |
| Arnd Bergmann | 1 | 0.13% | 1 | 3.70% |
| Eric W. Biedermann | 1 | 0.13% | 1 | 3.70% |
| Christian Brauner | 1 | 0.13% | 1 | 3.70% |
| Total | 787 | 27 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * Amit Bhor, Kanika Nema: Codito Technologies 2004 */ #include <linux/errno.h> #include <linux/module.h> #include <linux/sched.h> #include <linux/sched/task.h> #include <linux/sched/task_stack.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/unistd.h> #include <linux/ptrace.h> #include <linux/slab.h> #include <linux/syscalls.h> #include <linux/elf.h> #include <linux/tick.h> #include <asm/fpu.h> SYSCALL_DEFINE1(arc_settls, void *, user_tls_data_ptr) { task_thread_info(current)->thr_ptr = (unsigned int)user_tls_data_ptr; return 0; } /* * We return the user space TLS data ptr as sys-call return code * Ideally it should be copy to user. * However we can cheat by the fact that some sys-calls do return * absurdly high values * Since the tls dat aptr is not going to be in range of 0xFFFF_xxxx * it won't be considered a sys-call error * and it will be loads better than copy-to-user, which is a definite * D-TLB Miss */ SYSCALL_DEFINE0(arc_gettls) { return task_thread_info(current)->thr_ptr; } SYSCALL_DEFINE3(arc_usr_cmpxchg, int __user *, uaddr, int, expected, int, new) { struct pt_regs *regs = current_pt_regs(); u32 uval; int ret; /* * This is only for old cores lacking LLOCK/SCOND, which by definition * can't possibly be SMP. Thus doesn't need to be SMP safe. * And this also helps reduce the overhead for serializing in * the UP case */ WARN_ON_ONCE(IS_ENABLED(CONFIG_SMP)); /* Z indicates to userspace if operation succeeded */ regs->status32 &= ~STATUS_Z_MASK; ret = access_ok(uaddr, sizeof(*uaddr)); if (!ret) goto fail; again: preempt_disable(); ret = __get_user(uval, uaddr); if (ret) goto fault; if (uval != expected) goto out; ret = __put_user(new, uaddr); if (ret) goto fault; regs->status32 |= STATUS_Z_MASK; out: preempt_enable(); return uval; fault: preempt_enable(); if (unlikely(ret != -EFAULT)) goto fail; mmap_read_lock(current->mm); ret = fixup_user_fault(current->mm, (unsigned long) uaddr, FAULT_FLAG_WRITE, NULL); mmap_read_unlock(current->mm); if (likely(!ret)) goto again; fail: force_sig(SIGSEGV); return ret; } #ifdef CONFIG_ISA_ARCV2 void arch_cpu_idle(void) { /* Re-enable interrupts <= default irq priority before committing SLEEP */ const unsigned int arg = 0x10 | ARCV2_IRQ_DEF_PRIO; __asm__ __volatile__( "sleep %0 \n" : :"I"(arg)); /* can't be "r" has to be embedded const */ } #else /* ARC700 */ void arch_cpu_idle(void) { /* sleep, but enable both set E1/E2 (levels of interrupts) before committing */ __asm__ __volatile__("sleep 0x3 \n"); } #endif asmlinkage void ret_from_fork(void); /* * Copy architecture-specific thread state * * Layout of Child kernel mode stack as setup at the end of this function is * * | ... | * | ... | * | unused | * | | * ------------------ * | r25 | <==== top of Stack (thread.ksp) * ~ ~ * | --to-- | (CALLEE Regs of kernel mode) * | r13 | * ------------------ * | fp | * | blink | @ret_from_fork * ------------------ * | | * ~ ~ * ~ ~ * | | * ------------------ * | r12 | * ~ ~ * | --to-- | (scratch Regs of user mode) * | r0 | * ------------------ * | SP | * | orig_r0 | * | event/ECR | * | user_r25 | * ------------------ <===== END of PAGE */ int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long kthread_arg, struct task_struct *p, unsigned long tls) { struct pt_regs *c_regs; /* child's pt_regs */ unsigned long *childksp; /* to unwind out of __switch_to() */ struct callee_regs *c_callee; /* child's callee regs */ struct callee_regs *parent_callee; /* paren't callee */ struct pt_regs *regs = current_pt_regs(); /* Mark the specific anchors to begin with (see pic above) */ c_regs = task_pt_regs(p); childksp = (unsigned long *)c_regs - 2; /* 2 words for FP/BLINK */ c_callee = ((struct callee_regs *)childksp) - 1; /* * __switch_to() uses thread.ksp to start unwinding stack * For kernel threads we don't need to create callee regs, the * stack layout nevertheless needs to remain the same. * Also, since __switch_to anyways unwinds callee regs, we use * this to populate kernel thread entry-pt/args into callee regs, * so that ret_from_kernel_thread() becomes simpler. */ p->thread.ksp = (unsigned long)c_callee; /* THREAD_KSP */ /* __switch_to expects FP(0), BLINK(return addr) at top */ childksp[0] = 0; /* fp */ childksp[1] = (unsigned long)ret_from_fork; /* blink */ if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { memset(c_regs, 0, sizeof(struct pt_regs)); c_callee->r13 = kthread_arg; c_callee->r14 = usp; /* function */ return 0; } /*--------- User Task Only --------------*/ /* __switch_to expects FP(0), BLINK(return addr) at top of stack */ childksp[0] = 0; /* for POP fp */ childksp[1] = (unsigned long)ret_from_fork; /* for POP blink */ /* Copy parents pt regs on child's kernel mode stack */ *c_regs = *regs; if (usp) c_regs->sp = usp; c_regs->r0 = 0; /* fork returns 0 in child */ parent_callee = ((struct callee_regs *)regs) - 1; *c_callee = *parent_callee; if (unlikely(clone_flags & CLONE_SETTLS)) { /* * set task's userland tls data ptr from 4th arg * clone C-lib call is difft from clone sys-call */ task_thread_info(p)->thr_ptr = tls; } else { /* Normal fork case: set parent's TLS ptr in child */ task_thread_info(p)->thr_ptr = task_thread_info(current)->thr_ptr; } /* * setup usermode thread pointer #1: * when child is picked by scheduler, __switch_to() uses @c_callee to * populate usermode callee regs: this works (despite being in a kernel * function) since special return path for child @ret_from_fork() * ensures those regs are not clobbered all the way to RTIE to usermode */ c_callee->r25 = task_thread_info(p)->thr_ptr; #ifdef CONFIG_ARC_CURR_IN_REG /* * setup usermode thread pointer #2: * however for this special use of r25 in kernel, __switch_to() sets * r25 for kernel needs and only in the final return path is usermode * r25 setup, from pt_regs->user_r25. So set that up as well */ c_regs->user_r25 = c_callee->r25; #endif return 0; } /* * Do necessary setup to start up a new user task */ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) { regs->sp = usp; regs->ret = pc; /* * [U]ser Mode bit set * [L] ZOL loop inhibited to begin with - cleared by a LP insn * Interrupts enabled */ regs->status32 = STATUS_U_MASK | STATUS_L_MASK | ISA_INIT_STATUS_BITS; fpu_init_task(regs); /* bogus seed values for debugging */ regs->lp_start = 0x10; regs->lp_end = 0x80; } /* * Some archs flush debug and FPU info here */ void flush_thread(void) { } int elf_check_arch(const struct elf32_hdr *x) { unsigned int eflags; if (x->e_machine != EM_ARC_INUSE) { pr_err("ELF not built for %s ISA\n", is_isa_arcompact() ? "ARCompact":"ARCv2"); return 0; } eflags = x->e_flags; if ((eflags & EF_ARC_OSABI_MSK) != EF_ARC_OSABI_CURRENT) { pr_err("ABI mismatch - you need newer toolchain\n"); force_fatal_sig(SIGSEGV); return 0; } return 1; } EXPORT_SYMBOL(elf_check_arch);