diff options
Diffstat (limited to 'nuttx/arch/z80/src/common/up_saveusercontext.asm')
| -rw-r--r-- | nuttx/arch/z80/src/common/up_saveusercontext.asm | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/nuttx/arch/z80/src/common/up_saveusercontext.asm b/nuttx/arch/z80/src/common/up_saveusercontext.asm index 9d25a7800..5514f9e63 100644 --- a/nuttx/arch/z80/src/common/up_saveusercontext.asm +++ b/nuttx/arch/z80/src/common/up_saveusercontext.asm @@ -1,5 +1,5 @@ ;************************************************************************* -; common/up_saveusercontext.S +; common/up_saveusercontext.asm ; ; Copyright (C) 2007 Gregory Nutt. All rights reserved. ; Author: Gregory Nutt <spudmonkey@racsa.co.cr> @@ -39,15 +39,15 @@ ; Register save area layout - XCPT_I == 0 ; Saved I w/interrupt state in carry - XCPT_AF == 2 ; Saved AF register - XCPT_BC == 4 ; Saved BC register - XCPT_DE == 6 ; Saved DE register - XCPT_HL == 8 ; Saved HL register - XCPT_IX == 10 ; Saved IX register - XCPT_IY == 12 ; Saved IY register - XCPT_SP == 14 ; Offset to SP at time of interrupt - XCPT_PC == 16 ; Offset to PC at time of interrupt + .globl XCPT_I ; Saved I w/interrupt state in carry + .globl XCPT_AF ; Saved AF register + .globl XCPT_BC ; Saved BC register + .globl XCPT_DE ; Saved DE register + .globl XCPT_HL ; Saved HL register + .globl XCPT_IX ; Saved IX register + .globl XCPT_IY ; Saved IY register + .globl XCPT_SP ; Offset to SP at time of interrupt + .globl XCPT_PC ; Offset to PC at time of interrupt ; Stack frame @@ -63,7 +63,7 @@ ;************************************************************************* .area TEXT (ABS,OVR) -up_saveusercontext: +_up_saveusercontext: ; Set up a stack frame push ix ; Save IX and IY @@ -73,10 +73,10 @@ up_saveusercontext: ; Fetch the address of the save area - ld l, FRAME_REGS(ix) ; HL = save area address - ld h, FRAME_REGS+1(ix) ; + ld e, FRAME_REGS(ix) ; HL = save area address + ld d, FRAME_REGS+1(ix) ; ld iy, #0 - add iy, hl ; IY = save area address + add iy, de ; IY = save area address ; Then save the registers @@ -85,13 +85,13 @@ up_saveusercontext: ld a, i ; Get interrupt state push af pop hl - ld (iy+XCPT_I), l ; Offset 0: I w/interrupt state in carry - ld (iy+XCPT_I+1), h + ld XCPT_I(iy), l ; Offset 0: I w/interrupt state in carry + ld XCPT_I+1(iy), h ; Save BC at offset 1 - ld (iy+XCPT_BC), c ; Offset 1: BC - ld (iy+XCPT_BC+1), b + ld XCPT_BC(iy), c ; Offset 1: BC + ld XCPT_BC+1(iy), b ; DE is not preserved (offset 2) @@ -99,29 +99,29 @@ up_saveusercontext: ld l, FRAME_IX(ix) ; HL = Saved alue of IX ld h, FRAME_IX+1(ix) ; - ld (iy+XCPT_IX), l ; Offset 3: IX - ld (iy+XCPT_IX+1), h ; + ld XCPT_IX(iy), l ; Offset 3: IX + ld XCPT_IX+1(iy), h ; ; Save IY at offset 4 ld l, FRAME_IY(ix) ; HL = Saved value of IY ld h, FRAME_IY+1(ix) ; - ld (iy+XCPT_IY), l ; Offset 4: IY - ld (iy+XCPT_IY+1), h + ld XCPT_IY(iy), l ; Offset 4: IY + ld XCPT_IY+1(iy), h ; Save that stack pointer as it would be upon return in offset 5 ld hl, #SP_OFFSET ; Value of stack pointer on return add hl, sp - ld (iy+XCPT_SP), l ; Offset 5 SP - ld (iy+XCPT_SP+1), h + ld XCPT_SP(iy), l ; Offset 5 SP + ld XCPT_SP+1(iy), h ; HL is saved as the value 1 at offset 6 xor a ; A = 0 - ld (iy+XCPT_HL+1), a ; Offset 2: HL on return (=1) + ld XCPT_HL+1(iy), a ; Offset 2: HL on return (=1) inc a ; A = 1 - ld (iy+XCPT_HL), a ; + ld XCPT_HL(iy), a ; ; AF is not preserved (offset 7) @@ -129,8 +129,8 @@ up_saveusercontext: ld l, FRAME_RET(ix) ; HL = Saved return address ld h, FRAME_RET+1(ix) ; - ld (iy+XCPT_PC), l ; Offset 8: PC - ld (iy+XCPT_PC+1), h + ld XCPT_PC(iy), l ; Offset 8: PC + ld XCPT_PC+1(iy), h ; Return the value 0 |