diff options
Diffstat (limited to '')
| -rw-r--r-- | c/src/librdbg/src/m68k/rdbg_cpu_asm.S | 244 |
1 files changed, 0 insertions, 244 deletions
diff --git a/c/src/librdbg/src/m68k/rdbg_cpu_asm.S b/c/src/librdbg/src/m68k/rdbg_cpu_asm.S deleted file mode 100644 index d9f4dc9dad..0000000000 --- a/c/src/librdbg/src/m68k/rdbg_cpu_asm.S +++ /dev/null @@ -1,244 +0,0 @@ -/* rdbg_cpu_asm.s - * - * This file contains all assembly code for the Motorola m68k implementation - * of RDBG. - * - * $Id$ - * - */ - -#include <rtems/asm.h> -#include <rtems/score/cpu.h> - - BEGIN_CODE - -/* - * void copyback_data_cache_and_invalidate_instr_cache(addr, size) - * - * This routine performs a copy of the data cache - * and invalidate the instruction cache - */ - - .align 2 - PUBLIC (copyback_data_cache_and_invalidate_instr_cache) - -SYM (copyback_data_cache_and_invalidate_instr_cache): - nop | how? - rts - - - -/* - * void enterRdbg(void) - * - * This function performs trap #4 - * It is used : - * 1 - in the user code, to simulate a Breakpoint. - * (with justSaveContext = 0) - * 2 - in the RDBG code, to push a ctx in the list. - * (with justSaveContext = 1) - * - * In most of case, it will be use as described in 1. - * The 2nd possibility will be used by RDBG to obtain - * its own ctx - */ - - PUBLIC (enterRdbg) - -SYM (enterRdbg): - trap #4 - rts - - -/* - * void excHandler(void) - * - * lotsa copypaste from cpu_asm.S - * - */ - -/* - * The RTEMS jump table pushes vector - * - * The two types of exception frames on m68000 are - * - * uint16_t sr <- sp - * uint32_t pc - * - * uint16_t fc <- sp - * uint32_t addr - * uint16_t instr - * uint16_t sr - * uint32_t pc - * - * after real frame we push d0-d1/a0-a1 - * - * after that we push CPU_Exception_frame - * - * exframe <- sp - * d0-d1/a0-a1 - * frame - */ -#if ( M68K_COLDFIRE_ARCH == 1 ) -.set SR_OFFSET, 2 | Status register offset -.set PC_OFFSET, 4 | Program Counter offset -.set FVO_OFFSET, 0 | Format/vector offset -#elif ( M68K_HAS_VBR == 1 ) -.set SR_OFFSET, 0 | Status register offset -.set PC_OFFSET, 2 | Program Counter offset -.set FVO_OFFSET, 6 | Format/vector offset -#else -.set SR_OFFSET, 2 | Status register offset -.set PC_OFFSET, 4 | Program Counter offset -.set FVO_OFFSET, 0 | Format/vector offset placed in the stack -#endif /* M68K_HAS_VBR */ - - .align 4 - - PUBLIC (excHandler) - PUBLIC (BreakPointExcHdl) - -SYM (excFormatLength): - /* - * size of exception stack frame depending on format type - * This is valid for m68k with VBR (68020/030/040/CPU32/CPU32+) - * size | format/name - */ - dc.w 4*2 | $0 standard - dc.w 4*2 | $1 throwaway stackframe - dc.w 6*2 | $2 CHK/CHK2/TRAPcc/TRAPV/DIV0/TRACE - dc.w 6*2 | $3 Coprocessor Post-Instruction (040) - dc.w 4*2 | $4 reserved - dc.w 4*2 | $5 reserved - dc.w 4*2 | $6 reserved - dc.w 30*2 | $7 Access Error (040) - dc.w 29*2 | $8 Bus Error (020) - dc.w 10*2 | $9 Coprocessor Mid-Instruction (020) - dc.w 16*2 | $A Short Bus-Error (020) - dc.w 46*2 | $B Long Bus-Error (020) - dc.w 12*2 | $C Bus Error/Address Error (CPU32) - dc.w 4*2 | $D reserved - dc.w 4*2 | $E reserved - dc.w 4*2 | $F reserved - -SYM (excHandler): -#if ( M68K_COLDFIRE_ARCH == 1 ) - lea a7@(-16),a7 - movm.l d0-d1/a0-a1,a7@ | save d0-d1,a0-a1 - movew a7@(16+FVO_OFFSET),d0 | d0 = F/VO - andl #0x0ffc,d0 | d0 = vector offset in vbr - lsrl #2,d0 | d0 = vector number - lea a7@(16),a1 | address of orig frame - lea a7@(16),a0 | address of orig frame - lea a0@(8),a0 | skip exception frame -#else - moveml d0-d1/a0-a1,a7@- | save d0-d1,a0-a1 - movew a7@(16+FVO_OFFSET),d0 | d0 = F/VO -#if ( M68K_HAS_VBR == 1 ) - movew d0,d1 | d1 is copy of F/VO - andl #0x0ffc,d0 | d0 = vector offset in vbr - lsrl #2,d0 | d0 = vector number - lsrl #8,d1 - lsrl #3,d1 - andl #0x001f,d1 | d1 is format number - lea SYM (excFormatLength),a1 - movew a1@(d1),d1 | d1 = size of exc frame - lea a7@(16,d1),a0 - lea a7@(16),a1 | address of orig frame - -#else /* (M68k_HAS_VBR == 0) */ - lea a7@(16),a1 | address of orig frame - lea a1@(6),a0 | skip stack frame -/* - * skip bus error stack frame... - */ - cmpi.l #3,d0 - bgt 1f | if >3 then normal exc - lea a1@(8),a0 | skip extra stuff - lea a0@(6),a0 | a0 = orig sp -1: -#endif /* M68K_HAS_VBR */ -#endif /* ( M68K_COLDFIRE_ARCH == 0 ) */ - - /* - * at this point: - * a0 points to stack above exception stack frame - * a1 points to start of exception stack frame - */ - - movew a1@(SR_OFFSET),d1 | d1 = sr - andl #0xffff,d1 - lea a7@(-76),a7 | reserve room for exception frame -| build CPU_Exception_frame - movel d0,a7@ | vecnum - movel d1,a7@(4) | sr - movel a1@(PC_OFFSET),d1 | d1 = pc -#if ( M68K_COLDFIRE_ARCH == 0 ) - cmpiw #47,d0 | trap #15, breakpoint? -#else - cmpil #47,d0 | trap #15, breakpoint? -#endif - bne 2f - subql #2,d1 | real PC is at trap insn -2: movel d1,a7@(8) | store pc to exframe struct - movel a7@(76),a7@(12) | the orig d0 pushed at beginning - movel a7@(76+4),a7@(16) | the orig d1 pushed at beginning - movel d2,a7@(20) - movel d3,a7@(24) - movel d4,a7@(28) - movel d5,a7@(32) - movel d6,a7@(36) - movel d7,a7@(40) - movel a7@(76+8),a7@(44) | the orig a0 pushed at beginning - movel a7@(76+12),a7@(48) | the orig a1 pushed at beginning - movel a2,a7@(52) - movel a3,a7@(56) - movel a4,a7@(60) - movel a5,a7@(64) - movel a6,a7@(68) - movel a0,a7@(72) | stack pointer before exception - lea a7@,a0 | exframe address - movel a1,a7@- | save top of orig frame - movel a0,a7@- | push exframe address - jsr SYM(BreakPointExcHdl) - addql #4,a7 | pop exframe address - movel a7@+,a1 | restore orig frame address -| XXX what should be restored from exframe?? - movel a7@(4),d1 | sr - movew d1,a1@(SR_OFFSET) | store sr to frame XXX ??? - movel a7@(8),a1@(PC_OFFSET) | store pc to frame XXX ??? - movel a7@(12),a7@(76) | d0 to be restored from stack - movel a7@(16),a7@(76+4) | d1 to be restored from stack - movel a7@(20),d2 - movel a7@(24),d3 - movel a7@(28),d4 - movel a7@(32),d5 - movel a7@(36),d6 - movel a7@(40),d7 - movel a7@(44),a7@(76+8) | a0 to be restored from stack - movel a7@(48),a7@(76+12) | a1 to be restored from stack - movel a7@(52),a2 - movel a7@(56),a3 - movel a7@(60),a4 - movel a7@(64),a5 - movel a7@(68),a6 - addl #76,a7 | pop exframe - -#if ( M68K_COLDFIRE_ARCH == 0 ) - moveml a7@+,d0-d1/a0-a1 | restore d0-d1,a0-a1 -#else - moveml a7@,d0-d1/a0-a1 | restore d0-d1,a0-a1 - lea a7@(16),a7 -#endif - -#if ( M68K_HAS_VBR == 0 ) - addql #2,a7 | pop format/id -#endif /* M68K_HAS_VBR */ - -| XXX bus err cleanup - - rte - -END_CODE - -END |