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303 lines
9.3 KiB
303 lines
9.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* include/asm-parisc/processor.h |
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* |
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* Copyright (C) 1994 Linus Torvalds |
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* Copyright (C) 2001 Grant Grundler |
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*/ |
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#ifndef __ASM_PARISC_PROCESSOR_H |
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#define __ASM_PARISC_PROCESSOR_H |
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#ifndef __ASSEMBLY__ |
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#include <linux/threads.h> |
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#include <asm/prefetch.h> |
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#include <asm/hardware.h> |
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#include <asm/pdc.h> |
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#include <asm/ptrace.h> |
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#include <asm/types.h> |
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#include <asm/percpu.h> |
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#endif /* __ASSEMBLY__ */ |
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#define HAVE_ARCH_PICK_MMAP_LAYOUT |
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#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) |
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#define TASK_SIZE TASK_SIZE_OF(current) |
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#define TASK_UNMAPPED_BASE (current->thread.map_base) |
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#define DEFAULT_TASK_SIZE32 (0xFFF00000UL) |
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#define DEFAULT_MAP_BASE32 (0x40000000UL) |
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#ifdef CONFIG_64BIT |
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#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000) |
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#define DEFAULT_MAP_BASE (0x200000000UL) |
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#else |
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#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32 |
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#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32 |
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#endif |
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#ifdef __KERNEL__ |
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/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc. |
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* prumpf */ |
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#define STACK_TOP TASK_SIZE |
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#define STACK_TOP_MAX DEFAULT_TASK_SIZE |
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#endif |
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#ifndef __ASSEMBLY__ |
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unsigned long calc_max_stack_size(unsigned long stack_max); |
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/* |
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* Data detected about CPUs at boot time which is the same for all CPU's. |
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* HP boxes are SMP - ie identical processors. |
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* |
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* FIXME: some CPU rev info may be processor specific... |
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*/ |
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struct system_cpuinfo_parisc { |
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unsigned int cpu_count; |
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unsigned int cpu_hz; |
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unsigned int hversion; |
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unsigned int sversion; |
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enum cpu_type cpu_type; |
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struct { |
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struct pdc_model model; |
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unsigned long versions; |
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unsigned long cpuid; |
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unsigned long capabilities; |
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char sys_model_name[81]; /* PDC-ROM returnes this model name */ |
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} pdc; |
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const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ |
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const char *family_name; /* e.g. "1.1e" */ |
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}; |
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/* Per CPU data structure - ie varies per CPU. */ |
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struct cpuinfo_parisc { |
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unsigned long it_value; /* Interval Timer at last timer Intr */ |
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unsigned long irq_count; /* number of IRQ's since boot */ |
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unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */ |
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unsigned long hpa; /* Host Physical address */ |
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unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ |
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#ifdef CONFIG_SMP |
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unsigned long pending_ipi; /* bitmap of type ipi_message_type */ |
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#endif |
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unsigned long bh_count; /* number of times bh was invoked */ |
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unsigned long fp_rev; |
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unsigned long fp_model; |
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unsigned long cpu_num; /* CPU number from PAT firmware */ |
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unsigned long cpu_loc; /* CPU location from PAT firmware */ |
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unsigned int state; |
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struct parisc_device *dev; |
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}; |
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extern struct system_cpuinfo_parisc boot_cpu_data; |
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DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); |
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#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) |
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typedef struct { |
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int seg; |
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} mm_segment_t; |
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#define ARCH_MIN_TASKALIGN 8 |
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struct thread_struct { |
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struct pt_regs regs; |
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unsigned long task_size; |
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unsigned long map_base; |
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unsigned long flags; |
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}; |
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#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) |
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/* Thread struct flags. */ |
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#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */ |
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#define PARISC_UAC_SIGBUS (1UL << 1) |
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#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ |
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#define PARISC_UAC_SHIFT 0 |
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#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS) |
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#define SET_UNALIGN_CTL(task,value) \ |
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({ \ |
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(task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \ |
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| (((value) << PARISC_UAC_SHIFT) & \ |
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PARISC_UAC_MASK)); \ |
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0; \ |
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}) |
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#define GET_UNALIGN_CTL(task,addr) \ |
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({ \ |
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put_user(((task)->thread.flags & PARISC_UAC_MASK) \ |
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>> PARISC_UAC_SHIFT, (int __user *) (addr)); \ |
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}) |
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#define INIT_THREAD { \ |
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.regs = { .gr = { 0, }, \ |
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.fr = { 0, }, \ |
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.sr = { 0, }, \ |
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.iasq = { 0, }, \ |
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.iaoq = { 0, }, \ |
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.cr27 = 0, \ |
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}, \ |
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.task_size = DEFAULT_TASK_SIZE, \ |
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.map_base = DEFAULT_MAP_BASE, \ |
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.flags = 0 \ |
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} |
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struct task_struct; |
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void show_trace(struct task_struct *task, unsigned long *stack); |
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/* |
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* Start user thread in another space. |
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* |
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* Note that we set both the iaoq and r31 to the new pc. When |
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* the kernel initially calls execve it will return through an |
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* rfi path that will use the values in the iaoq. The execve |
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* syscall path will return through the gateway page, and |
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* that uses r31 to branch to. |
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* |
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* For ELF we clear r23, because the dynamic linker uses it to pass |
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* the address of the finalizer function. |
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* |
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* We also initialize sr3 to an illegal value (illegal for our |
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* implementation, not for the architecture). |
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*/ |
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typedef unsigned int elf_caddr_t; |
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/* The ELF abi wants things done a "wee bit" differently than |
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* som does. Supporting this behavior here avoids |
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* having our own version of create_elf_tables. |
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* |
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* Oh, and yes, that is not a typo, we are really passing argc in r25 |
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* and argv in r24 (rather than r26 and r25). This is because that's |
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* where __libc_start_main wants them. |
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* |
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* Duplicated from dl-machine.h for the benefit of readers: |
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* |
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* Our initial stack layout is rather different from everyone else's |
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* due to the unique PA-RISC ABI. As far as I know it looks like |
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* this: |
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----------------------------------- (user startup code creates this frame) |
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| 32 bytes of magic | |
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|---------------------------------| |
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| 32 bytes argument/sp save area | |
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|---------------------------------| (bprm->p) |
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| ELF auxiliary info | |
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| (up to 28 words) | |
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|---------------------------------| |
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| NULL | |
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|---------------------------------| |
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| Environment pointers | |
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|---------------------------------| |
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| NULL | |
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|---------------------------------| |
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| Argument pointers | |
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|---------------------------------| <- argv |
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| argc (1 word) | |
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|---------------------------------| <- bprm->exec (HACK!) |
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| N bytes of slack | |
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|---------------------------------| |
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| filename passed to execve | |
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|---------------------------------| (mm->env_end) |
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| env strings | |
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|---------------------------------| (mm->env_start, mm->arg_end) |
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| arg strings | |
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|---------------------------------| |
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| additional faked arg strings if | |
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| we're invoked via binfmt_script | |
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|---------------------------------| (mm->arg_start) |
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stack base is at TASK_SIZE - rlim_max. |
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on downward growing arches, it looks like this: |
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stack base at TASK_SIZE |
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| filename passed to execve |
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| env strings |
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| arg strings |
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| faked arg strings |
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| slack |
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| ELF |
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| envps |
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| argvs |
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| argc |
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* The pleasant part of this is that if we need to skip arguments we |
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* can just decrement argc and move argv, because the stack pointer |
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* is utterly unrelated to the location of the environment and |
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* argument vectors. |
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* |
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* Note that the S/390 people took the easy way out and hacked their |
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* GCC to make the stack grow downwards. |
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* |
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* Final Note: For entry from syscall, the W (wide) bit of the PSW |
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* is stuffed into the lowest bit of the user sp (%r30), so we fill |
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* it in here from the current->personality |
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*/ |
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#define USER_WIDE_MODE (!is_32bit_task()) |
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#define start_thread(regs, new_pc, new_sp) do { \ |
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elf_addr_t *sp = (elf_addr_t *)new_sp; \ |
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__u32 spaceid = (__u32)current->mm->context; \ |
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elf_addr_t pc = (elf_addr_t)new_pc | 3; \ |
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elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ |
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\ |
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regs->iasq[0] = spaceid; \ |
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regs->iasq[1] = spaceid; \ |
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regs->iaoq[0] = pc; \ |
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regs->iaoq[1] = pc + 4; \ |
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regs->sr[2] = LINUX_GATEWAY_SPACE; \ |
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regs->sr[3] = 0xffff; \ |
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regs->sr[4] = spaceid; \ |
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regs->sr[5] = spaceid; \ |
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regs->sr[6] = spaceid; \ |
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regs->sr[7] = spaceid; \ |
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regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ |
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regs->fr[ 0] = 0LL; \ |
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regs->fr[ 1] = 0LL; \ |
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regs->fr[ 2] = 0LL; \ |
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regs->fr[ 3] = 0LL; \ |
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regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ |
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regs->gr[31] = pc; \ |
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\ |
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get_user(regs->gr[25], (argv - 1)); \ |
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regs->gr[24] = (long) argv; \ |
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regs->gr[23] = 0; \ |
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} while(0) |
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struct mm_struct; |
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/* Free all resources held by a thread. */ |
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extern void release_thread(struct task_struct *); |
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extern unsigned long get_wchan(struct task_struct *p); |
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#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) |
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#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) |
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#define cpu_relax() barrier() |
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/* |
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* parisc_requires_coherency() is used to identify the combined VIPT/PIPT |
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* cached CPUs which require a guarantee of coherency (no inequivalent aliases |
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* with different data, whether clean or not) to operate |
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*/ |
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#ifdef CONFIG_PA8X00 |
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extern int _parisc_requires_coherency; |
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#define parisc_requires_coherency() _parisc_requires_coherency |
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#else |
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#define parisc_requires_coherency() (0) |
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#endif |
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extern int running_on_qemu; |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __ASM_PARISC_PROCESSOR_H */
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