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225 lines
5.7 KiB
225 lines
5.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* This file handles the architecture dependent parts of process handling. |
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* |
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* Copyright IBM Corp. 1999, 2009 |
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* Author(s): Martin Schwidefsky <[email protected]>, |
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* Hartmut Penner <[email protected]>, |
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* Denis Joseph Barrow, |
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*/ |
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#include <linux/elf-randomize.h> |
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#include <linux/compiler.h> |
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#include <linux/cpu.h> |
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#include <linux/sched.h> |
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#include <linux/sched/debug.h> |
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#include <linux/sched/task.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/elfcore.h> |
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#include <linux/smp.h> |
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#include <linux/slab.h> |
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#include <linux/interrupt.h> |
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#include <linux/tick.h> |
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#include <linux/personality.h> |
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#include <linux/syscalls.h> |
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#include <linux/compat.h> |
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#include <linux/kprobes.h> |
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#include <linux/random.h> |
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#include <linux/export.h> |
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#include <linux/init_task.h> |
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#include <linux/entry-common.h> |
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#include <asm/cpu_mf.h> |
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#include <asm/io.h> |
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#include <asm/processor.h> |
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#include <asm/vtimer.h> |
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#include <asm/exec.h> |
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#include <asm/irq.h> |
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#include <asm/nmi.h> |
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#include <asm/smp.h> |
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#include <asm/stacktrace.h> |
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#include <asm/switch_to.h> |
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#include <asm/runtime_instr.h> |
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#include <asm/unwind.h> |
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#include "entry.h" |
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void ret_from_fork(void) asm("ret_from_fork"); |
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void __ret_from_fork(struct task_struct *prev, struct pt_regs *regs) |
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{ |
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void (*func)(void *arg); |
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schedule_tail(prev); |
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if (!user_mode(regs)) { |
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/* Kernel thread */ |
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func = (void *)regs->gprs[9]; |
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func((void *)regs->gprs[10]); |
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} |
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clear_pt_regs_flag(regs, PIF_SYSCALL); |
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syscall_exit_to_user_mode(regs); |
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} |
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void flush_thread(void) |
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{ |
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} |
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void arch_setup_new_exec(void) |
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{ |
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if (S390_lowcore.current_pid != current->pid) { |
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S390_lowcore.current_pid = current->pid; |
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if (test_facility(40)) |
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lpp(&S390_lowcore.lpp); |
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} |
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} |
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void arch_release_task_struct(struct task_struct *tsk) |
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{ |
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runtime_instr_release(tsk); |
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guarded_storage_release(tsk); |
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} |
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int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) |
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{ |
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/* |
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* Save the floating-point or vector register state of the current |
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* task and set the CIF_FPU flag to lazy restore the FPU register |
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* state when returning to user space. |
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*/ |
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save_fpu_regs(); |
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memcpy(dst, src, arch_task_struct_size); |
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dst->thread.fpu.regs = dst->thread.fpu.fprs; |
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return 0; |
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} |
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int copy_thread(unsigned long clone_flags, unsigned long new_stackp, |
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unsigned long arg, struct task_struct *p, unsigned long tls) |
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{ |
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struct fake_frame |
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{ |
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struct stack_frame sf; |
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struct pt_regs childregs; |
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} *frame; |
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frame = container_of(task_pt_regs(p), struct fake_frame, childregs); |
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p->thread.ksp = (unsigned long) frame; |
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/* Save access registers to new thread structure. */ |
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save_access_regs(&p->thread.acrs[0]); |
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/* start new process with ar4 pointing to the correct address space */ |
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/* Don't copy debug registers */ |
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memset(&p->thread.per_user, 0, sizeof(p->thread.per_user)); |
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memset(&p->thread.per_event, 0, sizeof(p->thread.per_event)); |
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clear_tsk_thread_flag(p, TIF_SINGLE_STEP); |
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p->thread.per_flags = 0; |
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/* Initialize per thread user and system timer values */ |
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p->thread.user_timer = 0; |
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p->thread.guest_timer = 0; |
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p->thread.system_timer = 0; |
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p->thread.hardirq_timer = 0; |
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p->thread.softirq_timer = 0; |
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p->thread.last_break = 1; |
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frame->sf.back_chain = 0; |
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frame->sf.gprs[5] = (unsigned long)frame + sizeof(struct stack_frame); |
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frame->sf.gprs[6] = (unsigned long)p; |
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/* new return point is ret_from_fork */ |
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frame->sf.gprs[8] = (unsigned long)ret_from_fork; |
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/* fake return stack for resume(), don't go back to schedule */ |
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frame->sf.gprs[9] = (unsigned long)frame; |
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/* Store access registers to kernel stack of new process. */ |
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if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { |
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/* kernel thread */ |
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memset(&frame->childregs, 0, sizeof(struct pt_regs)); |
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frame->childregs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | |
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PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; |
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frame->childregs.psw.addr = |
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(unsigned long)__ret_from_fork; |
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frame->childregs.gprs[9] = new_stackp; /* function */ |
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frame->childregs.gprs[10] = arg; |
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frame->childregs.gprs[11] = (unsigned long)do_exit; |
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frame->childregs.orig_gpr2 = -1; |
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return 0; |
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} |
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frame->childregs = *current_pt_regs(); |
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frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */ |
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frame->childregs.flags = 0; |
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if (new_stackp) |
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frame->childregs.gprs[15] = new_stackp; |
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/* Don't copy runtime instrumentation info */ |
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p->thread.ri_cb = NULL; |
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frame->childregs.psw.mask &= ~PSW_MASK_RI; |
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/* Don't copy guarded storage control block */ |
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p->thread.gs_cb = NULL; |
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p->thread.gs_bc_cb = NULL; |
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/* Set a new TLS ? */ |
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if (clone_flags & CLONE_SETTLS) { |
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if (is_compat_task()) { |
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p->thread.acrs[0] = (unsigned int)tls; |
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} else { |
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p->thread.acrs[0] = (unsigned int)(tls >> 32); |
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p->thread.acrs[1] = (unsigned int)tls; |
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} |
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} |
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return 0; |
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} |
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void execve_tail(void) |
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{ |
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current->thread.fpu.fpc = 0; |
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asm volatile("sfpc %0" : : "d" (0)); |
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} |
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unsigned long get_wchan(struct task_struct *p) |
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{ |
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struct unwind_state state; |
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unsigned long ip = 0; |
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if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p)) |
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return 0; |
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if (!try_get_task_stack(p)) |
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return 0; |
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unwind_for_each_frame(&state, p, NULL, 0) { |
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if (state.stack_info.type != STACK_TYPE_TASK) { |
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ip = 0; |
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break; |
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} |
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ip = unwind_get_return_address(&state); |
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if (!ip) |
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break; |
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if (!in_sched_functions(ip)) |
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break; |
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} |
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put_task_stack(p); |
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return ip; |
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} |
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unsigned long arch_align_stack(unsigned long sp) |
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{ |
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if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
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sp -= get_random_int() & ~PAGE_MASK; |
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return sp & ~0xf; |
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} |
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static inline unsigned long brk_rnd(void) |
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{ |
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return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT; |
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} |
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unsigned long arch_randomize_brk(struct mm_struct *mm) |
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{ |
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unsigned long ret; |
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ret = PAGE_ALIGN(mm->brk + brk_rnd()); |
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return (ret > mm->brk) ? ret : mm->brk; |
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}
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