1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
139 lines
2.8 KiB
C
139 lines
2.8 KiB
C
#ifndef __M68K_ENTRY_H
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#define __M68K_ENTRY_H
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#include <linux/config.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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/*
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* Stack layout in 'ret_from_exception':
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*
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* This allows access to the syscall arguments in registers d1-d5
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*
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* 0(sp) - d1
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* 4(sp) - d2
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* 8(sp) - d3
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* C(sp) - d4
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* 10(sp) - d5
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* 14(sp) - a0
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* 18(sp) - a1
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* 1C(sp) - a2
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* 20(sp) - d0
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* 24(sp) - orig_d0
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* 28(sp) - stack adjustment
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* 2C(sp) - sr
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* 2E(sp) - pc
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* 32(sp) - format & vector
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*/
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/*
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* 97/05/14 Andreas: Register %a2 is now set to the current task throughout
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* the whole kernel.
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*/
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/* the following macro is used when enabling interrupts */
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#if defined(MACH_ATARI_ONLY) && !defined(CONFIG_HADES)
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/* block out HSYNC on the atari */
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#define ALLOWINT (~0x400)
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#define MAX_NOINT_IPL 3
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#else
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/* portable version */
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#define ALLOWINT (~0x700)
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#define MAX_NOINT_IPL 0
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#endif /* machine compilation types */
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#ifdef __ASSEMBLY__
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#define curptr a2
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LFLUSH_I_AND_D = 0x00000808
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LSIGTRAP = 5
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/* process bits for task_struct.ptrace */
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PT_TRACESYS_OFF = 3
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PT_TRACESYS_BIT = 1
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PT_PTRACED_OFF = 3
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PT_PTRACED_BIT = 0
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PT_DTRACE_OFF = 3
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PT_DTRACE_BIT = 2
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#define SAVE_ALL_INT save_all_int
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#define SAVE_ALL_SYS save_all_sys
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#define RESTORE_ALL restore_all
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/*
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* This defines the normal kernel pt-regs layout.
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*
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* regs a3-a6 and d6-d7 are preserved by C code
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* the kernel doesn't mess with usp unless it needs to
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*/
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/*
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* a -1 in the orig_d0 field signifies
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* that the stack frame is NOT for syscall
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*/
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.macro save_all_int
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clrl %sp@- | stk_adj
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pea -1:w | orig d0
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movel %d0,%sp@- | d0
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moveml %d1-%d5/%a0-%a1/%curptr,%sp@-
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.endm
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.macro save_all_sys
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clrl %sp@- | stk_adj
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movel %d0,%sp@- | orig d0
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movel %d0,%sp@- | d0
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moveml %d1-%d5/%a0-%a1/%curptr,%sp@-
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.endm
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.macro restore_all
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moveml %sp@+,%a0-%a1/%curptr/%d1-%d5
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movel %sp@+,%d0
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addql #4,%sp | orig d0
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addl %sp@+,%sp | stk adj
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rte
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.endm
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#define SWITCH_STACK_SIZE (6*4+4) /* includes return address */
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#define SAVE_SWITCH_STACK save_switch_stack
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#define RESTORE_SWITCH_STACK restore_switch_stack
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#define GET_CURRENT(tmp) get_current tmp
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.macro save_switch_stack
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moveml %a3-%a6/%d6-%d7,%sp@-
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.endm
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.macro restore_switch_stack
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moveml %sp@+,%a3-%a6/%d6-%d7
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.endm
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.macro get_current reg=%d0
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movel %sp,\reg
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andw #-THREAD_SIZE,\reg
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movel \reg,%curptr
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movel %curptr@,%curptr
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.endm
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#else /* C source */
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#define STR(X) STR1(X)
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#define STR1(X) #X
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#define PT_OFF_ORIG_D0 0x24
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#define PT_OFF_FORMATVEC 0x32
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#define PT_OFF_SR 0x2C
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#define SAVE_ALL_INT \
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"clrl %%sp@-;" /* stk_adj */ \
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"pea -1:w;" /* orig d0 = -1 */ \
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"movel %%d0,%%sp@-;" /* d0 */ \
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"moveml %%d1-%%d5/%%a0-%%a2,%%sp@-"
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#define GET_CURRENT(tmp) \
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"movel %%sp,"#tmp"\n\t" \
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"andw #-"STR(THREAD_SIZE)","#tmp"\n\t" \
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"movel "#tmp",%%a2\n\t" \
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"movel %%a2@,%%a2"
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#endif
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#endif /* __M68K_ENTRY_H */
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