acef2e55d2
Add some commentary about UML internals, for a strange trick. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
158 lines
3.3 KiB
C
158 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#ifndef __UM_PROCESSOR_GENERIC_H
|
|
#define __UM_PROCESSOR_GENERIC_H
|
|
|
|
struct pt_regs;
|
|
|
|
struct task_struct;
|
|
|
|
#include "linux/config.h"
|
|
#include "asm/ptrace.h"
|
|
#include "choose-mode.h"
|
|
|
|
struct mm_struct;
|
|
|
|
struct thread_struct {
|
|
/* This flag is set to 1 before calling do_fork (and analyzed in
|
|
* copy_thread) to mark that we are begin called from userspace (fork /
|
|
* vfork / clone), and reset to 0 after. It is left to 0 when called
|
|
* from kernelspace (i.e. kernel_thread() or fork_idle(), as of 2.6.11). */
|
|
int forking;
|
|
int nsyscalls;
|
|
struct pt_regs regs;
|
|
unsigned long cr2;
|
|
int err;
|
|
unsigned long trap_no;
|
|
int singlestep_syscall;
|
|
void *fault_addr;
|
|
void *fault_catcher;
|
|
struct task_struct *prev_sched;
|
|
unsigned long temp_stack;
|
|
void *exec_buf;
|
|
struct arch_thread arch;
|
|
union {
|
|
#ifdef CONFIG_MODE_TT
|
|
struct {
|
|
int extern_pid;
|
|
int tracing;
|
|
int switch_pipe[2];
|
|
int vm_seq;
|
|
} tt;
|
|
#endif
|
|
#ifdef CONFIG_MODE_SKAS
|
|
struct {
|
|
void *switch_buf;
|
|
void *fork_buf;
|
|
int mm_count;
|
|
} skas;
|
|
#endif
|
|
} mode;
|
|
struct {
|
|
int op;
|
|
union {
|
|
struct {
|
|
int pid;
|
|
} fork, exec;
|
|
struct {
|
|
int (*proc)(void *);
|
|
void *arg;
|
|
} thread;
|
|
struct {
|
|
void (*proc)(void *);
|
|
void *arg;
|
|
} cb;
|
|
} u;
|
|
} request;
|
|
};
|
|
|
|
#define INIT_THREAD \
|
|
{ \
|
|
.forking = 0, \
|
|
.nsyscalls = 0, \
|
|
.regs = EMPTY_REGS, \
|
|
.cr2 = 0, \
|
|
.err = 0, \
|
|
.fault_addr = NULL, \
|
|
.prev_sched = NULL, \
|
|
.temp_stack = 0, \
|
|
.exec_buf = NULL, \
|
|
.arch = INIT_ARCH_THREAD, \
|
|
.request = { 0 } \
|
|
}
|
|
|
|
typedef struct {
|
|
unsigned long seg;
|
|
} mm_segment_t;
|
|
|
|
extern struct task_struct *alloc_task_struct(void);
|
|
|
|
extern void release_thread(struct task_struct *);
|
|
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
|
|
extern void dump_thread(struct pt_regs *regs, struct user *u);
|
|
|
|
static inline void prepare_to_copy(struct task_struct *tsk)
|
|
{
|
|
}
|
|
|
|
|
|
extern unsigned long thread_saved_pc(struct task_struct *t);
|
|
|
|
static inline void mm_copy_segments(struct mm_struct *from_mm,
|
|
struct mm_struct *new_mm)
|
|
{
|
|
}
|
|
|
|
#define init_stack (init_thread_union.stack)
|
|
|
|
/*
|
|
* User space process size: 3GB (default).
|
|
*/
|
|
extern unsigned long task_size;
|
|
|
|
#define TASK_SIZE (task_size)
|
|
|
|
/* This decides where the kernel will search for a free chunk of vm
|
|
* space during mmap's.
|
|
*/
|
|
#define TASK_UNMAPPED_BASE (0x40000000)
|
|
|
|
extern void start_thread(struct pt_regs *regs, unsigned long entry,
|
|
unsigned long stack);
|
|
|
|
struct cpuinfo_um {
|
|
unsigned long loops_per_jiffy;
|
|
int ipi_pipe[2];
|
|
};
|
|
|
|
extern struct cpuinfo_um boot_cpu_data;
|
|
|
|
#define my_cpu_data cpu_data[smp_processor_id()]
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern struct cpuinfo_um cpu_data[];
|
|
#define current_cpu_data cpu_data[smp_processor_id()]
|
|
#else
|
|
#define cpu_data (&boot_cpu_data)
|
|
#define current_cpu_data boot_cpu_data
|
|
#endif
|
|
|
|
#define KSTK_EIP(tsk) (PT_REGS_IP(&tsk->thread.regs))
|
|
#define KSTK_ESP(tsk) (PT_REGS_SP(&tsk->thread.regs))
|
|
#define get_wchan(p) (0)
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
|
* adjust the settings for this buffer only. This must remain at the end
|
|
* of the file.
|
|
* ---------------------------------------------------------------------------
|
|
* Local variables:
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|