diff options
Diffstat (limited to 'arch/s390/kernel/process.c')
| -rw-r--r-- | arch/s390/kernel/process.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c new file mode 100644 index 000000000..99ef537e5 --- /dev/null +++ b/arch/s390/kernel/process.c @@ -0,0 +1,243 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * This file handles the architecture dependent parts of process handling. + * + * Copyright IBM Corp. 1999, 2009 + * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, + * Hartmut Penner <hp@de.ibm.com>, + * Denis Joseph Barrow, + */ + +#include <linux/elf-randomize.h> +#include <linux/compiler.h> +#include <linux/cpu.h> +#include <linux/sched.h> +#include <linux/sched/debug.h> +#include <linux/sched/task.h> +#include <linux/sched/task_stack.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/elfcore.h> +#include <linux/smp.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/tick.h> +#include <linux/personality.h> +#include <linux/syscalls.h> +#include <linux/compat.h> +#include <linux/kprobes.h> +#include <linux/random.h> +#include <linux/export.h> +#include <linux/init_task.h> +#include <asm/cpu_mf.h> +#include <asm/io.h> +#include <asm/processor.h> +#include <asm/vtimer.h> +#include <asm/exec.h> +#include <asm/irq.h> +#include <asm/nmi.h> +#include <asm/smp.h> +#include <asm/switch_to.h> +#include <asm/runtime_instr.h> +#include "entry.h" + +asmlinkage void ret_from_fork(void) asm ("ret_from_fork"); + +extern void kernel_thread_starter(void); + +void flush_thread(void) +{ +} + +void arch_setup_new_exec(void) +{ + if (S390_lowcore.current_pid != current->pid) { + S390_lowcore.current_pid = current->pid; + if (test_facility(40)) + lpp(&S390_lowcore.lpp); + } +} + +void arch_release_task_struct(struct task_struct *tsk) +{ + runtime_instr_release(tsk); + guarded_storage_release(tsk); +} + +int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) +{ + /* + * Save the floating-point or vector register state of the current + * task and set the CIF_FPU flag to lazy restore the FPU register + * state when returning to user space. + */ + save_fpu_regs(); + + memcpy(dst, src, arch_task_struct_size); + dst->thread.fpu.regs = dst->thread.fpu.fprs; + return 0; +} + +int copy_thread_tls(unsigned long clone_flags, unsigned long new_stackp, + unsigned long arg, struct task_struct *p, unsigned long tls) +{ + struct fake_frame + { + struct stack_frame sf; + struct pt_regs childregs; + } *frame; + + frame = container_of(task_pt_regs(p), struct fake_frame, childregs); + p->thread.ksp = (unsigned long) frame; + /* Save access registers to new thread structure. */ + save_access_regs(&p->thread.acrs[0]); + /* start new process with ar4 pointing to the correct address space */ + p->thread.mm_segment = get_fs(); + /* Don't copy debug registers */ + memset(&p->thread.per_user, 0, sizeof(p->thread.per_user)); + memset(&p->thread.per_event, 0, sizeof(p->thread.per_event)); + clear_tsk_thread_flag(p, TIF_SINGLE_STEP); + p->thread.per_flags = 0; + /* Initialize per thread user and system timer values */ + p->thread.user_timer = 0; + p->thread.guest_timer = 0; + p->thread.system_timer = 0; + p->thread.hardirq_timer = 0; + p->thread.softirq_timer = 0; + + frame->sf.back_chain = 0; + /* new return point is ret_from_fork */ + frame->sf.gprs[8] = (unsigned long) ret_from_fork; + /* fake return stack for resume(), don't go back to schedule */ + frame->sf.gprs[9] = (unsigned long) frame; + + /* Store access registers to kernel stack of new process. */ + if (unlikely(p->flags & PF_KTHREAD)) { + /* kernel thread */ + memset(&frame->childregs, 0, sizeof(struct pt_regs)); + frame->childregs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | + PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; + frame->childregs.psw.addr = + (unsigned long) kernel_thread_starter; + frame->childregs.gprs[9] = new_stackp; /* function */ + frame->childregs.gprs[10] = arg; + frame->childregs.gprs[11] = (unsigned long) do_exit; + frame->childregs.orig_gpr2 = -1; + + return 0; + } + frame->childregs = *current_pt_regs(); + frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */ + frame->childregs.flags = 0; + if (new_stackp) + frame->childregs.gprs[15] = new_stackp; + + /* Don't copy runtime instrumentation info */ + p->thread.ri_cb = NULL; + frame->childregs.psw.mask &= ~PSW_MASK_RI; + /* Don't copy guarded storage control block */ + p->thread.gs_cb = NULL; + p->thread.gs_bc_cb = NULL; + + /* Set a new TLS ? */ + if (clone_flags & CLONE_SETTLS) { + if (is_compat_task()) { + p->thread.acrs[0] = (unsigned int)tls; + } else { + p->thread.acrs[0] = (unsigned int)(tls >> 32); + p->thread.acrs[1] = (unsigned int)tls; + } + } + return 0; +} + +asmlinkage void execve_tail(void) +{ + current->thread.fpu.fpc = 0; + asm volatile("sfpc %0" : : "d" (0)); +} + +/* + * fill in the FPU structure for a core dump. + */ +int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs) +{ + save_fpu_regs(); + fpregs->fpc = current->thread.fpu.fpc; + fpregs->pad = 0; + if (MACHINE_HAS_VX) + convert_vx_to_fp((freg_t *)&fpregs->fprs, + current->thread.fpu.vxrs); + else + memcpy(&fpregs->fprs, current->thread.fpu.fprs, + sizeof(fpregs->fprs)); + return 1; +} +EXPORT_SYMBOL(dump_fpu); + +unsigned long get_wchan(struct task_struct *p) +{ + struct stack_frame *sf, *low, *high; + unsigned long return_address; + int count; + + if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p)) + return 0; + + if (!try_get_task_stack(p)) + return 0; + + low = task_stack_page(p); + high = (struct stack_frame *) task_pt_regs(p); + sf = (struct stack_frame *) p->thread.ksp; + if (sf <= low || sf > high) { + return_address = 0; + goto out; + } + for (count = 0; count < 16; count++) { + sf = (struct stack_frame *) sf->back_chain; + if (sf <= low || sf > high) { + return_address = 0; + goto out; + } + return_address = sf->gprs[8]; + if (!in_sched_functions(return_address)) + goto out; + } +out: + put_task_stack(p); + return return_address; +} + +unsigned long arch_align_stack(unsigned long sp) +{ + if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) + sp -= get_random_int() & ~PAGE_MASK; + return sp & ~0xf; +} + +static inline unsigned long brk_rnd(void) +{ + return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT; +} + +unsigned long arch_randomize_brk(struct mm_struct *mm) +{ + unsigned long ret; + + ret = PAGE_ALIGN(mm->brk + brk_rnd()); + return (ret > mm->brk) ? ret : mm->brk; +} + +void set_fs_fixup(void) +{ + struct pt_regs *regs = current_pt_regs(); + static bool warned; + + set_fs(USER_DS); + if (warned) + return; + WARN(1, "Unbalanced set_fs - int code: 0x%x\n", regs->int_code); + show_registers(regs); + warned = true; +} |