diff options
Diffstat (limited to 'cpukit/score/cpu/m68k/cpu_asm.S')
-rw-r--r-- | cpukit/score/cpu/m68k/cpu_asm.S | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/cpukit/score/cpu/m68k/cpu_asm.S b/cpukit/score/cpu/m68k/cpu_asm.S index a50ced6934..006922c227 100644 --- a/cpukit/score/cpu/m68k/cpu_asm.S +++ b/cpukit/score/cpu/m68k/cpu_asm.S @@ -15,6 +15,15 @@ #include <rtems/asm.h> + .data + +#if (defined(__mcoldfire__)) +#if ( M68K_HAS_FPU == 1 ) +PUBLIC (_CPU_cacr_shadow) +SYM (_CPU_cacr_shadow): + .long 1 +#endif +#endif .text @@ -35,6 +44,32 @@ SYM (_CPU_Context_switch): movml d1-d7/a2-a7,a0@ | save context moval a7@(HEIRCONTEXT_ARG),a0| a0 = heir thread context + +#if (defined(__mcoldfire__)) +#if ( M68K_HAS_FPU == 1 ) + moveb a0@(13*4),d0 | get context specific DF bit info in d0 + btstb #4,d0 | test context specific DF bit info + beq fpu_on | branch if FPU needs to be switched on + +fpu_off: movl _CPU_cacr_shadow,d0 | get content of _CPU_cacr_shadow in d0 + btstl #4,d0 | test DF bit info in d0 + bne restore | branch if FPU is already switched off + bsetl #4,d0 | set DF bit in d0 + bra cacr_set | branch to set the new FPU setting in cacr and _CPU_cacr_shadow + +fpu_on: movl _CPU_cacr_shadow,d0 | get content of _CPU_cacr_shadow in d1 + btstl #4,d0 | test context specific DF bit info + beq restore | branch if FPU is already switched on + bclrl #4,d0 | clear DF bit info in d0 + +cacr_set: movew sr,d1 | get content of sr in d1 + oril #0x00000700,d1 | mask d1 + movew d1,sr | disable all interrupts + movl d0,_CPU_cacr_shadow | move _CPU_cacr_shadow to d1 + movec d0,cacr | enable FPU in cacr +#endif +#endif + restore: movml a0@,d1-d7/a2-a7 | restore context movw d1,sr | restore status register rts @@ -66,6 +101,42 @@ restore: movml a0@,d1-d7/a2-a7 | restore context .global SYM (_CPU_Context_save_fp) SYM (_CPU_Context_save_fp): #if ( M68K_HAS_FPU == 1 ) +#if (defined(__mcoldfire__)) + + moval a7@(FPCONTEXT_ARG),a1 | a1 = &ptr to context area + moval a1@,a0 | a0 = Save context area + leal a0@(-16),a0 | open context frame for coldfire state frame + fsave a0@ | save coldfire state frame + tstb a0@ | check for a null frame + beq.b nosave | Yes, skip save of user model + leal a0@(-64),a0 | open context frame for coldfire data registers (fp0-fp7) + fmovem fp0-fp7,a0@ | save coldfire data registers (fp0-fp7) + movl #-1,a0@- | place not-null flag on stack +nosave: movl a0,a1@ | save pointer to saved context + +#if ( M68K_HAS_EMAC == 1 ) + + movel macsr,d0 | store content of macsr in d0 + clrl d1 | clear d1 + movl d1,macsr | disable rounding in macsr + movl acc0,d1 | store content of acc0 in d1 + moveml d0-d1,a0@(-8) | save EMAC macsr/acc0 + movl acc1,d0 | store acc1 in d0 + movl acc2,d1 | store acc2 in d1 + moveml d0-d1,a0@(-16) | save EMAC acc1/acc2 with offset + movl acc3,d0 | store acc3 in d0 + movl accext01,d1 | store acc2 in d1 + moveml d0-d1,a0@(-24) | save EMAC acc3/accext01 with offset + movl accext23,d0 | store accext23 in d0 + movl mask,d1 | store mask in d1 + moveml d0-d1,a0@(-32) | save EMAC accext23/mask with offset + leal a0@(-32),a0 | set a0 to the begin of coldfire data registers frame (fp0-fp7) + movl a0,a1@ | save pointer to saved context + +#endif + +#else + moval a7@(FPCONTEXT_ARG),a1 | a1 = &ptr to context area moval a1@,a0 | a0 = Save context area #if ( !defined(__mcoldfire__) && !__mc68060__ ) @@ -88,6 +159,8 @@ SYM (_CPU_Context_save_fp): #endif movl #-1,a0@- | place not-null flag on stack nosv: movl a0,a1@ | save pointer to saved context + +#endif #endif rts @@ -95,6 +168,43 @@ nosv: movl a0,a1@ | save pointer to saved context .global SYM (_CPU_Context_restore_fp) SYM (_CPU_Context_restore_fp): #if ( M68K_HAS_FPU == 1 ) + +#if (defined(__mcoldfire__)) + + moval a7@(FPCONTEXT_ARG),a1 | a1 = &ptr to context area + moval a1@,a0 | a0 = address of saved context + +#if ( M68K_HAS_EMAC == 1 ) + + clrl d0 | clear d0 + movl d0,macsr | disable roundrounding in macsr + moveml a0@(0),d0-d1 | get mask/accext23 in d0/d1 + movl d0,mask | restore mask + movl d1,accext23 | restore accext23 + moveml a0@(8),d0-d1 | get accext01/acc3 in d0/d1 + movl d0,accext01 | restore accext01 + movl d1,acc3 | restore acc3 + moveml a0@(16),d0-d1 | get acc2/acc1 in d0/d1 + movl d0,acc2 | restore acc2 + movl d1,acc1 | restore acc1 + moveml a0@(24),d0-d1 | get acc0/macsr in d0/d1 + movl d0,acc0 | restore acc0 + movl d1,macsr | restore macsr + leal a0@(32),a0 | set a0 to the begin of coldfire FPU frame + +#endif + + tstb a0@ | Null context frame? + beq.b norest | Yes, skip fp restore + addql #4,a0 | throwaway non-null flag + fmovem a0@,fp0-fp7 | restore data regs (fp0-fp7) + leal a0@(+64),a0 | close context frame for coldfire data registers (fp0-fp7) +norest: frestore a0@ | restore the fp state frame + leal a0@(+16),a0 | close context frame for coldfire state frame + movl a0,a1@ | save pointer to saved context + +#else + moval a7@(FPCONTEXT_ARG),a1 | a1 = &ptr to context area moval a1@,a0 | a0 = address of saved context tstb a0@ | Null context frame? @@ -114,6 +224,8 @@ norst: frestore a0@ | restore the fp state frame lea a0@(FP_STATE_SAVED),a0 #endif movl a0,a1@ | save pointer to saved context + +#endif #endif rts #endif |