7bf9a37d8d
This patch solve a bug triggered by execvp (this function use calloc to store the argument list and gcc 3.4.x align the stack to word, not to dword). This situation aren't related to signal handling and all 2.6.x have the bug. On ColdFire targets we must force the stack to be aligned. Original patch from Andrea Tarani <andrea.tarani@gilbarco.com>, Signed-off-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/*
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* include/asm-m68k/processor.h
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*
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* Copyright (C) 1995 Hamish Macdonald
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*/
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#ifndef __ASM_M68K_PROCESSOR_H
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#define __ASM_M68K_PROCESSOR_H
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ __label__ _l; _l: &&_l;})
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#include <linux/threads.h>
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#include <asm/types.h>
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#include <asm/segment.h>
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#include <asm/fpu.h>
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#include <asm/ptrace.h>
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#include <asm/current.h>
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static inline unsigned long rdusp(void)
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{
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#ifdef CONFIG_COLDFIRE
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extern unsigned int sw_usp;
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return(sw_usp);
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#else
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unsigned long usp;
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__asm__ __volatile__("move %/usp,%0" : "=a" (usp));
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return usp;
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#endif
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}
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static inline void wrusp(unsigned long usp)
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{
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#ifdef CONFIG_COLDFIRE
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extern unsigned int sw_usp;
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sw_usp = usp;
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#else
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__asm__ __volatile__("move %0,%/usp" : : "a" (usp));
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#endif
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}
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/*
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* User space process size: 3.75GB. This is hardcoded into a few places,
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* so don't change it unless you know what you are doing.
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*/
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#define TASK_SIZE (0xF0000000UL)
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/*
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* This decides where the kernel will search for a free chunk of vm
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* space during mmap's. We won't be using it
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*/
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#define TASK_UNMAPPED_BASE 0
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/*
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* if you change this structure, you must change the code and offsets
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* in m68k/machasm.S
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*/
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struct thread_struct {
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unsigned long ksp; /* kernel stack pointer */
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unsigned long usp; /* user stack pointer */
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unsigned short sr; /* saved status register */
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unsigned short fs; /* saved fs (sfc, dfc) */
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unsigned long crp[2]; /* cpu root pointer */
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unsigned long esp0; /* points to SR of stack frame */
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unsigned long fp[8*3];
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unsigned long fpcntl[3]; /* fp control regs */
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unsigned char fpstate[FPSTATESIZE]; /* floating point state */
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};
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#define INIT_THREAD { \
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sizeof(init_stack) + (unsigned long) init_stack, 0, \
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PS_S, __KERNEL_DS, \
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{0, 0}, 0, {0,}, {0, 0, 0}, {0,}, \
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}
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/*
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* Coldfire stacks need to be re-aligned on trap exit, conventional
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* 68k can handle this case cleanly.
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*/
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#if defined(CONFIG_COLDFIRE)
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#define reformat(_regs) do { (_regs)->format = 0x4; } while(0)
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#else
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#define reformat(_regs) do { } while (0)
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#endif
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/*
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* Do necessary setup to start up a newly executed thread.
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*
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* pass the data segment into user programs if it exists,
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* it can't hurt anything as far as I can tell
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*/
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#define start_thread(_regs, _pc, _usp) \
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do { \
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set_fs(USER_DS); /* reads from user space */ \
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(_regs)->pc = (_pc); \
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((struct switch_stack *)(_regs))[-1].a6 = 0; \
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reformat(_regs); \
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if (current->mm) \
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(_regs)->d5 = current->mm->start_data; \
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(_regs)->sr &= ~0x2000; \
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wrusp(_usp); \
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} while(0)
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/* Forward declaration, a strange C thing */
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struct task_struct;
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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}
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/* Prepare to copy thread state - unlazy all lazy status */
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#define prepare_to_copy(tsk) do { } while (0)
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extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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/*
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* Free current thread data structures etc..
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*/
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static inline void exit_thread(void)
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{
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}
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unsigned long thread_saved_pc(struct task_struct *tsk);
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unsigned long get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) \
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({ \
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unsigned long eip = 0; \
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if ((tsk)->thread.esp0 > PAGE_SIZE && \
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(virt_addr_valid((tsk)->thread.esp0))) \
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eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
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eip; })
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#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
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#define cpu_relax() do { } while (0)
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#endif
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