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mod_ctrl struct cleanup
git-svn-id: svn://svn.cc65.org/cc65/trunk@1260 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
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@ -68,14 +68,12 @@ Header: .res O65_HDR_SIZE ; The o65 header
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; Input
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InputByte = Header ; Byte read from input
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; Stuff needed for relocation. Since the ld65 linker uses a relocation base
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; address of zero for all segments, the relocation values needed are actually
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; the start addresses of the segments. Among other things this means that the
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; relocation value for the text segment is the same as the start address as
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; the whole module block.
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TextReloc = Module ; Relocation value for code seg
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DataReloc = Header + 1 ; Relocation value for data seg
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BssReloc = Header + 3 ; Relocation value for bss seg
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; Segment addresses. Since the ld65 linker uses a relocation base address
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; of zero for all segments, the addresses of the segments are also the
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; relocation values.
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CodeAddr = Module ; Address of code seg
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DataAddr = Header + 1 ; Address of data seg
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BssAddr = Header + 3 ; Address of bss seg
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.data
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Read: jmp $FFFF ; Jump to read routine
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@ -97,18 +95,6 @@ PushCtrl:
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ldx Ctrl+1
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jmp pushax
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;------------------------------------------------------------------------------
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; LoadCtrl: Load a word from the control structure into a/x. The offset of the
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; high byte is passed in Y.
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.code
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LoadCtrl:
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lda (Ctrl),y
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tax
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dey
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lda (Ctrl),y
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rts
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;------------------------------------------------------------------------------
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; RestoreRegBank: Restore the register bank contents from the save area. Will
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; destroy A and X (the latter will be zero on return).
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@ -129,20 +115,20 @@ RestoreRegBank:
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GetReloc:
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cmp #O65_SEGID_TEXT
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bne @L1
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lda TextReloc
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ldx TextReloc+1
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lda CodeAddr
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ldx CodeAddr+1
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rts
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@L1: cmp #O65_SEGID_DATA
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bne @L2
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lda DataReloc
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ldx DataReloc+1
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lda DataAddr
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ldx DataAddr+1
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rts
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@L2: cmp #O65_SEGID_BSS
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bne @L3
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lda BssReloc
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ldx BssReloc+1
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lda BssAddr
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ldx BssAddr+1
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rts
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@L3: cmp #O65_SEGID_ZP
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@ -344,10 +330,12 @@ _mod_load:
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; Get the read function pointer from the control structure and place it into
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; our call vector
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ldy #MODCTRL_READ+1
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jsr LoadCtrl
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ldy #MODCTRL_READ
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lda (Ctrl),y
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sta Read+1
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stx Read+2
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iny
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lda (Ctrl),y
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sta Read+2
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; Read the o65 header: C->read (C, &H, sizeof (H))
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@ -418,58 +406,33 @@ OptDone:
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lda #MLOAD_ERR_MEM
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jmp CleanupAndExit
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; We got the memory block. Setup the pointers and sizes in the control
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; structure. We will use internal knowlege about the layout of the structure
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; here to save some code.
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; We got the memory block. Place a pointer to the memory block also in the
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; module control structure.
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GotMem: lda Module ; Ctrl->module = Module;
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ldy #MODCTRL_MODULE
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sta (Ctrl),y
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ldy #MODCTRL_CODE ; Ctrl->code = Module;
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sta (Ctrl),y
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txa
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iny
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sta (Ctrl),y ; MODCTRL_CODE+1
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ldy #MODCTRL_MODULE+1
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sta (Ctrl),y
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; The following loop will also copy some information that is not needed just
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; to save some code.
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; Calculate the start addresses of the segments. Since the linker uses a
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; base address of zero for all segments, the load addresses are also the
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; relocation values for the segments.
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ldx #O65_HDR_TLEN
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ldy #MODCTRL_CODE_SIZE
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CLoop: lda Header,x
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sta (Ctrl),y
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inx
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iny
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cpy #MODCTRL_SIZE
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bne CLoop
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; Missing in the control structure now: start of the data and bss segments.
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; Since the linker relocates all segments to zero, these addresses are also
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; the relocation values for the segments.
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ldy #MODCTRL_DATA
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lda Module
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add Header + O65_HDR_TLEN
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sta (Ctrl),y
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sta DataReloc
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iny
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sta DataAddr
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lda Module + 1
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adc Header + O65_HDR_TLEN + 1
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sta (Ctrl),y
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sta DataReloc + 1
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sta DataAddr + 1
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ldy #MODCTRL_BSS
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lda Module
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add TPtr
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sta (Ctrl),y
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sta BssReloc
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iny
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sta BssAddr
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lda Module+1
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add TPtr+1
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sta (Ctrl),y
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sta BssReloc + 1
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sta BssAddr + 1
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; Control structure is complete now. Load code and data segment into memory.
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; The sum of the sizes of code+data segment is still in TPtr.
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@ -494,8 +457,8 @@ CLoop: lda Header,x
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beq Reloc
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Undef: jmp FormatError
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; Number of undefined references was zero. Next sections are the relocation
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; tables for code and data segment. Relocate the code segment
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; Number of undefined references was zero. Next come the relocation tables
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; for code and data segment. Relocate the code segment
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Reloc: lda Module
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ldx Module + 1 ; Code segment address
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@ -503,14 +466,19 @@ Reloc: lda Module
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; Relocate the data segment
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ldy #MODCTRL_DATA + 1
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jsr LoadCtrl ; Get data segment address
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lda Module
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add Header + O65_HDR_TLEN
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pha
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lda Module + 1
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adc Header + O65_HDR_TLEN + 1
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tax
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pla ; Date segment address in a/x
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jsr RelocSeg
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; Clear the bss segment
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; Clear the bss segment: memset (bss_addr, 0, bss_size)
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ldy #MODCTRL_BSS + 1
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jsr LoadCtrl ; Load bss segment address
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lda BssAddr
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ldx BssAddr + 1
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jsr pushax
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jsr push0
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lda Header + O65_HDR_BLEN
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