138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
#ifndef __M68K_ENTRY_H
|
|
#define __M68K_ENTRY_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 */
|