135 lines
2.4 KiB
ArmAsm
135 lines
2.4 KiB
ArmAsm
/*
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gint core module: syscalls
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System calls (and the like) used by the library. The library should
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rely the least possible on the system, but sometimes using the syscalls
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is nothing of a nuisance.
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For instance, using the malloc()-family syscalls is a bit annoying
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because it "locks" many functionalities. On the other hand, getting the
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SaveDisp() buffer addresses to store data here is not a problem since
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such data can very easily be relocated to static RAM.
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*/
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/* Dynamic allocation */
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.global ___malloc
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.global ___free
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.global ___realloc
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/* OS version */
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.global ___get_os_version
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/* Return to menu */
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.global ___system_menu
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___malloc:
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mov.l syscall_table, r2
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mov.l 1f, r0
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jmp @r2
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nop
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1: .long 0xacd
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___free:
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mov.l syscall_table, r2
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mov.l 1f, r0
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jmp @r2
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nop
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1: .long 0xacc
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___realloc:
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mov.l syscall_table, r2
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mov.l 1f, r0
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jmp @r2
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nop
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1: .long 0xe6d
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___get_os_version:
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mov.l syscall_table, r2
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mov.l 1f, r0
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jmp @r2
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nop
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1: .long 0x02ee
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/*
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__system_menu()
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Brings one back to the system menu by putting KEY_MENU in the system's
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key buffer and calling GetKeyWait(). Of course this needs to be
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executed while under system control.
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*/
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___system_menu:
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sts.l pr, @-r15
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add #-4, r15
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/* Copying gint's VRAM into the system's. */
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mov.l syscall_table, r1
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mov.l .syscall_vram, r0
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jsr @r1
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mov.l r4, @r15 /* gint video ram */
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mov r0, r4
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mov.l @r15, r5
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mov.w .vram_size, r6
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mov.l .memcpy, r1
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jsr @r1
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nop
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/* Putting the matrix code in the key buffer. */
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mov r15, r4
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mov.w .matrix_menu, r2
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mov.w r2, @r4
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mov.l syscall_table, r1
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mov.l .syscall_putcode, r0
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jsr @r1
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nop
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/* Calling GetKeyWait() to display menu. */
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mov r15, r4 /* column pointer */
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add #-4, r15
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mov r15, r5 /* row pointer */
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add #-4, r15
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mov r15, r1 /* keycode pointer */
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mov #2, r6 /* type of waiting */
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mov #0, r7 /* timeout period */
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mov.l r1, @-r15
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mov #0, r2 /* allow return to menu */
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mov.l r2, @-r15
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mov.l syscall_table, r1
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mov.l .syscall_getkeywait, r0
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jsr @r1
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nop
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/* If the program counter reaches this place, it means that the user
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has come back to the program. Restore stack and leave. */
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add #20, r15
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lds.l @r15+, pr
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rts
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nop
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.align 4
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.syscall_getkeywait:
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.long 0x0247
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.syscall_putcode:
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.long 0x024f
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.syscall_vram:
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.long 0x0135
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.matrix_menu:
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.word 0x0308
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.vram_size:
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.word 1024
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.memcpy:
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.long _memcpy
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.align 4
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syscall_table:
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.long 0x80010070
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