Revision 7ab02af428c2d312c0cf8fb0b01cc1eb21131a3d authored by Linus Torvalds on 02 February 2010, 20:37:44 UTC, committed by Linus Torvalds on 02 February 2010, 20:37:44 UTC
Commit 221af7f87b9 ("Split 'flush_old_exec' into two functions") split the function at the point of no return - ie right where there were no more error cases to check. That made sense from a technical standpoint, but when we then also combined it with the actual personality setting going in between flush_old_exec() and setup_new_exec(), it needs to be a bit more careful. In particular, we need to make sure that we really flush the old personality bits in the 'flush' stage, rather than later in the 'setup' stage, since otherwise we might be flushing the _new_ personality state that we're just setting up. So this moves the flags and personality flushing (and 'flush_thread()', which is the arch-specific function that generally resets lazy FP state etc) of the old process into flush_old_exec(), so that it doesn't affect any state that execve() is setting up for the new process environment. This was reported by Michal Simek as breaking his Microblaze qemu environment. Reported-and-tested-by: Michal Simek <michal.simek@petalogix.com> Cc: Peter Anvin <hpa@zytor.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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boot.h
/* -*- linux-c -*- ------------------------------------------------------- *
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright 2007 rPath, Inc. - All Rights Reserved
* Copyright 2009 Intel Corporation; author H. Peter Anvin
*
* This file is part of the Linux kernel, and is made available under
* the terms of the GNU General Public License version 2.
*
* ----------------------------------------------------------------------- */
/*
* Header file for the real-mode kernel code
*/
#ifndef BOOT_BOOT_H
#define BOOT_BOOT_H
#define STACK_SIZE 512 /* Minimum number of bytes for stack */
#ifndef __ASSEMBLY__
#include <stdarg.h>
#include <linux/types.h>
#include <linux/edd.h>
#include <asm/boot.h>
#include <asm/setup.h>
#include "bitops.h"
#include <asm/cpufeature.h>
#include <asm/processor-flags.h>
/* Useful macros */
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
extern struct setup_header hdr;
extern struct boot_params boot_params;
/* Basic port I/O */
static inline void outb(u8 v, u16 port)
{
asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
}
static inline u8 inb(u16 port)
{
u8 v;
asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
return v;
}
static inline void outw(u16 v, u16 port)
{
asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
}
static inline u16 inw(u16 port)
{
u16 v;
asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
return v;
}
static inline void outl(u32 v, u16 port)
{
asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
}
static inline u32 inl(u32 port)
{
u32 v;
asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
return v;
}
static inline void io_delay(void)
{
const u16 DELAY_PORT = 0x80;
asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
}
/* These functions are used to reference data in other segments. */
static inline u16 ds(void)
{
u16 seg;
asm("movw %%ds,%0" : "=rm" (seg));
return seg;
}
static inline void set_fs(u16 seg)
{
asm volatile("movw %0,%%fs" : : "rm" (seg));
}
static inline u16 fs(void)
{
u16 seg;
asm volatile("movw %%fs,%0" : "=rm" (seg));
return seg;
}
static inline void set_gs(u16 seg)
{
asm volatile("movw %0,%%gs" : : "rm" (seg));
}
static inline u16 gs(void)
{
u16 seg;
asm volatile("movw %%gs,%0" : "=rm" (seg));
return seg;
}
typedef unsigned int addr_t;
static inline u8 rdfs8(addr_t addr)
{
u8 v;
asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
return v;
}
static inline u16 rdfs16(addr_t addr)
{
u16 v;
asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
return v;
}
static inline u32 rdfs32(addr_t addr)
{
u32 v;
asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
return v;
}
static inline void wrfs8(u8 v, addr_t addr)
{
asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
}
static inline void wrfs16(u16 v, addr_t addr)
{
asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
}
static inline void wrfs32(u32 v, addr_t addr)
{
asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
}
static inline u8 rdgs8(addr_t addr)
{
u8 v;
asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
return v;
}
static inline u16 rdgs16(addr_t addr)
{
u16 v;
asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
return v;
}
static inline u32 rdgs32(addr_t addr)
{
u32 v;
asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
return v;
}
static inline void wrgs8(u8 v, addr_t addr)
{
asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
}
static inline void wrgs16(u16 v, addr_t addr)
{
asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
}
static inline void wrgs32(u32 v, addr_t addr)
{
asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
}
/* Note: these only return true/false, not a signed return value! */
static inline int memcmp(const void *s1, const void *s2, size_t len)
{
u8 diff;
asm("repe; cmpsb; setnz %0"
: "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
return diff;
}
static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
{
u8 diff;
asm volatile("fs; repe; cmpsb; setnz %0"
: "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
return diff;
}
static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
{
u8 diff;
asm volatile("gs; repe; cmpsb; setnz %0"
: "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
return diff;
}
static inline int isdigit(int ch)
{
return (ch >= '0') && (ch <= '9');
}
/* Heap -- available for dynamic lists. */
extern char _end[];
extern char *HEAP;
extern char *heap_end;
#define RESET_HEAP() ((void *)( HEAP = _end ))
static inline char *__get_heap(size_t s, size_t a, size_t n)
{
char *tmp;
HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
tmp = HEAP;
HEAP += s*n;
return tmp;
}
#define GET_HEAP(type, n) \
((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
static inline bool heap_free(size_t n)
{
return (int)(heap_end-HEAP) >= (int)n;
}
/* copy.S */
void copy_to_fs(addr_t dst, void *src, size_t len);
void *copy_from_fs(void *dst, addr_t src, size_t len);
void copy_to_gs(addr_t dst, void *src, size_t len);
void *copy_from_gs(void *dst, addr_t src, size_t len);
void *memcpy(void *dst, void *src, size_t len);
void *memset(void *dst, int c, size_t len);
#define memcpy(d,s,l) __builtin_memcpy(d,s,l)
#define memset(d,c,l) __builtin_memset(d,c,l)
/* a20.c */
int enable_a20(void);
/* apm.c */
int query_apm_bios(void);
/* bioscall.c */
struct biosregs {
union {
struct {
u32 edi;
u32 esi;
u32 ebp;
u32 _esp;
u32 ebx;
u32 edx;
u32 ecx;
u32 eax;
u32 _fsgs;
u32 _dses;
u32 eflags;
};
struct {
u16 di, hdi;
u16 si, hsi;
u16 bp, hbp;
u16 _sp, _hsp;
u16 bx, hbx;
u16 dx, hdx;
u16 cx, hcx;
u16 ax, hax;
u16 gs, fs;
u16 es, ds;
u16 flags, hflags;
};
struct {
u8 dil, dih, edi2, edi3;
u8 sil, sih, esi2, esi3;
u8 bpl, bph, ebp2, ebp3;
u8 _spl, _sph, _esp2, _esp3;
u8 bl, bh, ebx2, ebx3;
u8 dl, dh, edx2, edx3;
u8 cl, ch, ecx2, ecx3;
u8 al, ah, eax2, eax3;
};
};
};
void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
/* cmdline.c */
int cmdline_find_option(const char *option, char *buffer, int bufsize);
int cmdline_find_option_bool(const char *option);
/* cpu.c, cpucheck.c */
struct cpu_features {
int level; /* Family, or 64 for x86-64 */
int model;
u32 flags[NCAPINTS];
};
extern struct cpu_features cpu;
int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
int validate_cpu(void);
/* edd.c */
void query_edd(void);
/* header.S */
void __attribute__((noreturn)) die(void);
/* mca.c */
int query_mca(void);
/* memory.c */
int detect_memory(void);
/* pm.c */
void __attribute__((noreturn)) go_to_protected_mode(void);
/* pmjump.S */
void __attribute__((noreturn))
protected_mode_jump(u32 entrypoint, u32 bootparams);
/* printf.c */
int sprintf(char *buf, const char *fmt, ...);
int vsprintf(char *buf, const char *fmt, va_list args);
int printf(const char *fmt, ...);
/* regs.c */
void initregs(struct biosregs *regs);
/* string.c */
int strcmp(const char *str1, const char *str2);
size_t strnlen(const char *s, size_t maxlen);
unsigned int atou(const char *s);
/* tty.c */
void puts(const char *);
void putchar(int);
int getchar(void);
void kbd_flush(void);
int getchar_timeout(void);
/* video.c */
void set_video(void);
/* video-mode.c */
int set_mode(u16 mode);
int mode_defined(u16 mode);
void probe_cards(int unsafe);
/* video-vesa.c */
void vesa_store_edid(void);
#endif /* __ASSEMBLY__ */
#endif /* BOOT_BOOT_H */
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