mirror of https://github.com/cc65/cc65.git
121 lines
2.9 KiB
ArmAsm
121 lines
2.9 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 2012-07-22
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;
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; unsigned char __fastcall__ em_load_driver (const char* name)
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; /* Load an extended memory driver and return an error code */
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.include "em-kernel.inc"
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.include "em-error.inc"
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.include "modload.inc"
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.include "fcntl.inc"
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.import pushax
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.import pusha0
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.import incsp2
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.import _open
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.import _read
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.import _close
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;----------------------------------------------------------------------------
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; Variables
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.data
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ctrl: .addr _read
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.res 2 ; CALLERDATA
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.res 2 ; MODULE
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.res 2 ; MODULE_SIZE
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.res 2 ; MODULE_ID
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;----------------------------------------------------------------------------
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; Code
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.code
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.proc _em_load_driver
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; Check if we do already have a driver loaded. This is an error. Do not
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; touch A/X because they contain the file name.
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ldy _em_drv
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bne @L0
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ldy _em_drv+1
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beq @L1
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@L0: lda #EM_ERR_INSTALLED
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bne @L4
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; Push the name onto the C stack and open the file. The parameter will get
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; removed by open().
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; ctrl.callerdata = open (name, O_RDONLY);
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@L1: jsr pushax
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lda #<O_RDONLY
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jsr pusha0
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ldy #4 ; Argument size
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jsr _open
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sta ctrl + MOD_CTRL::CALLERDATA
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stx ctrl + MOD_CTRL::CALLERDATA+1
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; if (ctrl.callerdata >= 0) {
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txa
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bmi @L3
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; /* Load the module */
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; Res = mod_load (&ctrl);
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lda #<ctrl
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ldx #>ctrl
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jsr _mod_load
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pha
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; /* Close the input file */
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; close (ctrl.callerdata);
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lda ctrl + MOD_CTRL::CALLERDATA
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ldx ctrl + MOD_CTRL::CALLERDATA+1
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jsr _close
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; /* Check the return code */
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; if (Res == MLOAD_OK) {
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pla
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bne @L3
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; Check the driver signature, install the driver.
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; Res = em_install (ctrl.module);
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lda ctrl + MOD_CTRL::MODULE
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ldx ctrl + MOD_CTRL::MODULE+1
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jsr _em_install
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; If em_install was successful, we're done
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tax
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beq @L2
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; The driver didn't install correctly. Remove it from memory and return the
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; error code.
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pha ; Save the error code
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lda _em_drv
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ldx _em_drv+1
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jsr _mod_free ; Free the driver memory
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jsr em_clear_ptr ; Clear em_drv
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pla ; Restore the error code
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ldx #0 ; We must return an int
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@L2: rts ; Done
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; Open or mod_load failed. Return an error code.
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@L3: lda #<EM_ERR_CANNOT_LOAD
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@L4: ldx #0
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rts
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.endproc
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