diff options
Diffstat (limited to 'include/asm-m68k/entry.h')
| -rw-r--r-- | include/asm-m68k/entry.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/include/asm-m68k/entry.h b/include/asm-m68k/entry.h new file mode 100644 index 00000000000..0396495cd97 --- /dev/null +++ b/include/asm-m68k/entry.h @@ -0,0 +1,138 @@ +#ifndef __M68K_ENTRY_H +#define __M68K_ENTRY_H + +#include <linux/config.h> +#include <asm/setup.h> +#include <asm/page.h> + +/* + * Stack layout in 'ret_from_exception': + * + * This allows access to the syscall arguments in registers d1-d5 + * + * 0(sp) - d1 + * 4(sp) - d2 + * 8(sp) - d3 + * C(sp) - d4 + * 10(sp) - d5 + * 14(sp) - a0 + * 18(sp) - a1 + * 1C(sp) - a2 + * 20(sp) - d0 + * 24(sp) - orig_d0 + * 28(sp) - stack adjustment + * 2C(sp) - sr + * 2E(sp) - pc + * 32(sp) - format & vector + */ + +/* + * 97/05/14 Andreas: Register %a2 is now set to the current task throughout + * the whole kernel. + */ + +/* the following macro is used when enabling interrupts */ +#if defined(MACH_ATARI_ONLY) && !defined(CONFIG_HADES) + /* block out HSYNC on the atari */ +#define ALLOWINT (~0x400) +#define MAX_NOINT_IPL 3 +#else + /* portable version */ +#define ALLOWINT (~0x700) +#define MAX_NOINT_IPL 0 +#endif /* machine compilation types */ + +#ifdef __ASSEMBLY__ + +#define curptr a2 + +LFLUSH_I_AND_D = 0x00000808 +LSIGTRAP = 5 + +/* process bits for task_struct.ptrace */ +PT_TRACESYS_OFF = 3 +PT_TRACESYS_BIT = 1 +PT_PTRACED_OFF = 3 +PT_PTRACED_BIT = 0 +PT_DTRACE_OFF = 3 +PT_DTRACE_BIT = 2 + +#define SAVE_ALL_INT save_all_int +#define SAVE_ALL_SYS save_all_sys +#define RESTORE_ALL restore_all +/* + * This defines the normal kernel pt-regs layout. + * + * regs a3-a6 and d6-d7 are preserved by C code + * the kernel doesn't mess with usp unless it needs to + */ + +/* + * a -1 in the orig_d0 field signifies + * that the stack frame is NOT for syscall + */ +.macro save_all_int + clrl %sp@- | stk_adj + pea -1:w | orig d0 + movel %d0,%sp@- | d0 + moveml %d1-%d5/%a0-%a1/%curptr,%sp@- +.endm + +.macro save_all_sys + clrl %sp@- | stk_adj + movel %d0,%sp@- | orig d0 + movel %d0,%sp@- | d0 + moveml %d1-%d5/%a0-%a1/%curptr,%sp@- +.endm + +.macro restore_all + moveml %sp@+,%a0-%a1/%curptr/%d1-%d5 + movel %sp@+,%d0 + addql #4,%sp | orig d0 + addl %sp@+,%sp | stk adj + rte +.endm + +#define SWITCH_STACK_SIZE (6*4+4) /* includes return address */ + +#define SAVE_SWITCH_STACK save_switch_stack +#define RESTORE_SWITCH_STACK restore_switch_stack +#define GET_CURRENT(tmp) get_current tmp + +.macro save_switch_stack + moveml %a3-%a6/%d6-%d7,%sp@- +.endm + +.macro restore_switch_stack + moveml %sp@+,%a3-%a6/%d6-%d7 +.endm + +.macro get_current reg=%d0 + movel %sp,\reg + andw #-THREAD_SIZE,\reg + movel \reg,%curptr + movel %curptr@,%curptr +.endm + +#else /* C source */ + +#define STR(X) STR1(X) +#define STR1(X) #X + +#define PT_OFF_ORIG_D0 0x24 +#define PT_OFF_FORMATVEC 0x32 +#define PT_OFF_SR 0x2C +#define SAVE_ALL_INT \ + "clrl %%sp@-;" /* stk_adj */ \ + "pea -1:w;" /* orig d0 = -1 */ \ + "movel %%d0,%%sp@-;" /* d0 */ \ + "moveml %%d1-%%d5/%%a0-%%a2,%%sp@-" +#define GET_CURRENT(tmp) \ + "movel %%sp,"#tmp"\n\t" \ + "andw #-"STR(THREAD_SIZE)","#tmp"\n\t" \ + "movel "#tmp",%%a2\n\t" \ + "movel %%a2@,%%a2" + +#endif + +#endif /* __M68K_ENTRY_H */ |