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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [alpha/] [kernel/] [process.c] - Rev 1765
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/* * linux/arch/alpha/kernel/process.c * * Copyright (C) 1995 Linus Torvalds */ /* * This file handles the architecture-dependent parts of process handling.. */ #include <linux/config.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/stddef.h> #include <linux/unistd.h> #include <linux/ptrace.h> #include <linux/malloc.h> #include <linux/ldt.h> #include <linux/user.h> #include <linux/a.out.h> #include <linux/utsname.h> #include <linux/time.h> #include <linux/major.h> #include <linux/stat.h> #include <linux/mman.h> #include <linux/elfcore.h> #include <asm/reg.h> #include <asm/segment.h> #include <asm/system.h> #include <asm/io.h> asmlinkage int sys_sethae(unsigned long hae, unsigned long a1, unsigned long a2, unsigned long a3, unsigned long a4, unsigned long a5, struct pt_regs regs) { (®s)->hae = hae; return 0; } asmlinkage int sys_idle(void) { if (current->pid != 0) return -EPERM; /* endless idle loop with no priority at all */ current->counter = -100; for (;;) { schedule(); } } #include <asm/hwrpb.h> static void swap_context(struct thread_struct * pcb) { __asm__ __volatile__( "bis %0,%0,$16\n\t" "call_pal %1\n\t" : /* no outputs */ : "r" (pcb), "i" (PAL_swpctx) : "$0", "$1", "$16", "$22", "$23", "$24", "$25"); } void hard_reset_now(void) { #if defined(CONFIG_ALPHA_SRM_SETUP) extern void reset_for_srm(void); extern struct hwrpb_struct *hwrpb; extern struct thread_struct *original_pcb_ptr; struct percpu_struct *cpup; unsigned long flags; cpup = (struct percpu_struct *) ((unsigned long)hwrpb + hwrpb->processor_offset); flags = cpup->flags; #if 1 printk("hard_reset_now: flags 0x%lx\n", flags); #endif flags &= ~0x0000000000ff0001UL; /* clear reason to "default" */ flags |= 0x0000000000020000UL; /* this is "cold bootstrap" */ /* flags |= 0x0000000000030000UL; *//* this is "warm bootstrap" */ /* flags |= 0x0000000000040000UL; *//* this is "remain halted" */ cpup->flags = flags; mb(); reset_for_srm(); swap_context(original_pcb_ptr); #endif #if defined(CONFIG_ALPHA_SRM) && defined(CONFIG_ALPHA_ALCOR) /* who said DEC engineer's have no sense of humor? ;-)) */ *(int *) GRU_RESET = 0x0000dead; mb(); #endif halt(); } void show_regs(struct pt_regs * regs) { printk("\nps: %04lx pc: [<%016lx>]\n", regs->ps, regs->pc); printk("rp: [<%016lx>] sp: %p\n", regs->r26, regs+1); printk(" r0: %016lx r1: %016lx r2: %016lx r3: %016lx\n", regs->r0, regs->r1, regs->r2, regs->r3); printk(" r4: %016lx r5: %016lx r6: %016lx r7: %016lx\n", regs->r4, regs->r5, regs->r6, regs->r7); printk(" r8: %016lx r16: %016lx r17: %016lx r18: %016lx\n", regs->r8, regs->r16, regs->r17, regs->r18); printk("r19: %016lx r20: %016lx r21: %016lx r22: %016lx\n", regs->r19, regs->r20, regs->r21, regs->r22); printk("r23: %016lx r24: %016lx r25: %016lx r26: %016lx\n", regs->r23, regs->r24, regs->r25, regs->r26); printk("r27: %016lx r28: %016lx r29: %016lx hae: %016lx\n", regs->r27, regs->r28, regs->gp, regs->hae); } /* * Re-start a thread when doing execve() */ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp) { set_fs(USER_DS); regs->pc = pc; regs->ps = 8; wrusp(sp); } /* * Free current thread data structures etc.. */ void exit_thread(void) { } void flush_thread(void) { } void release_thread(struct task_struct *dead_task) { } /* * "alpha_clone()".. By the time we get here, the * non-volatile registers have also been saved on the * stack. We do some ugly pointer stuff here.. (see * also copy_thread) * * Notice that "fork()" is implemented in terms of clone, * with parameters (SIGCHLD, 0). */ int alpha_clone(unsigned long clone_flags, unsigned long usp, struct switch_stack * swstack) { if (!usp) usp = rdusp(); return do_fork(clone_flags, usp, (struct pt_regs *) (swstack+1)); } extern void ret_from_sys_call(void); /* * Copy an alpha thread.. * * Note the "stack_offset" stuff: when returning to kernel mode, we need * to have some extra stack-space for the kernel stack that still exists * after the "ret_from_sys_call". When returning to user mode, we only * want the space needed by the syscall stack frame (ie "struct pt_regs"). * Use the passed "regs" pointer to determine how much space we need * for a kernel fork(). */ void copy_thread(int nr, unsigned long clone_flags, unsigned long usp, struct task_struct * p, struct pt_regs * regs) { struct pt_regs * childregs; struct switch_stack * childstack, *stack; unsigned long stack_offset; stack_offset = PAGE_SIZE - sizeof(struct pt_regs); if (!(regs->ps & 8)) stack_offset = (PAGE_SIZE-1) & (unsigned long) regs; childregs = (struct pt_regs *) (p->kernel_stack_page + stack_offset); *childregs = *regs; childregs->r0 = 0; childregs->r19 = 0; childregs->r20 = 1; /* OSF/1 has some strange fork() semantics.. */ regs->r20 = 0; stack = ((struct switch_stack *) regs) - 1; childstack = ((struct switch_stack *) childregs) - 1; *childstack = *stack; childstack->r26 = (unsigned long) ret_from_sys_call; p->tss.usp = usp; p->tss.ksp = (unsigned long) childstack; p->tss.pal_flags = 1; /* set FEN, clear everything else */ p->tss.flags = current->tss.flags; p->mm->context = 0; } /* * fill in the user structure for a core dump.. */ void dump_thread(struct pt_regs * pt, struct user * dump) { /* switch stack follows right below pt_regs: */ struct switch_stack * sw = ((struct switch_stack *) pt) - 1; dump->magic = CMAGIC; dump->start_code = current->mm->start_code; dump->start_data = current->mm->start_data; dump->start_stack = rdusp() & ~(PAGE_SIZE - 1); dump->u_tsize = (current->mm->end_code - dump->start_code) >> PAGE_SHIFT; dump->u_dsize = (current->mm->brk + (PAGE_SIZE - 1) - dump->start_data) >> PAGE_SHIFT; dump->u_ssize = (current->mm->start_stack - dump->start_stack + PAGE_SIZE - 1) >> PAGE_SHIFT; /* * We store the registers in an order/format that is * compatible with DEC Unix/OSF/1 as this makes life easier * for gdb. */ dump->regs[EF_V0] = pt->r0; dump->regs[EF_T0] = pt->r1; dump->regs[EF_T1] = pt->r2; dump->regs[EF_T2] = pt->r3; dump->regs[EF_T3] = pt->r4; dump->regs[EF_T4] = pt->r5; dump->regs[EF_T5] = pt->r6; dump->regs[EF_T6] = pt->r7; dump->regs[EF_T7] = pt->r8; dump->regs[EF_S0] = sw->r9; dump->regs[EF_S1] = sw->r10; dump->regs[EF_S2] = sw->r11; dump->regs[EF_S3] = sw->r12; dump->regs[EF_S4] = sw->r13; dump->regs[EF_S5] = sw->r14; dump->regs[EF_S6] = sw->r15; dump->regs[EF_A3] = pt->r19; dump->regs[EF_A4] = pt->r20; dump->regs[EF_A5] = pt->r21; dump->regs[EF_T8] = pt->r22; dump->regs[EF_T9] = pt->r23; dump->regs[EF_T10] = pt->r24; dump->regs[EF_T11] = pt->r25; dump->regs[EF_RA] = pt->r26; dump->regs[EF_T12] = pt->r27; dump->regs[EF_AT] = pt->r28; dump->regs[EF_SP] = rdusp(); dump->regs[EF_PS] = pt->ps; dump->regs[EF_PC] = pt->pc; dump->regs[EF_GP] = pt->gp; dump->regs[EF_A0] = pt->r16; dump->regs[EF_A1] = pt->r17; dump->regs[EF_A2] = pt->r18; memcpy((char *)dump->regs + EF_SIZE, sw->fp, 32 * 8); } int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r) { /* switch stack follows right below pt_regs: */ struct switch_stack * sw = ((struct switch_stack *) regs) - 1; memcpy(r, sw->fp, 32 * 8); return 1; } /* * sys_execve() executes a new program. * * This works due to the alpha calling sequence: the first 6 args * are gotten from registers, while the rest is on the stack, so * we get a0-a5 for free, and then magically find "struct pt_regs" * on the stack for us.. * * Don't do this at home. */ asmlinkage int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3, unsigned long a4, unsigned long a5, struct pt_regs regs) { int error; char * filename; error = getname((char *) a0, &filename); if (error) return error; error = do_execve(filename, (char **) a1, (char **) a2, ®s); putname(filename); return error; }