90 lines
1.6 KiB
ArmAsm
90 lines
1.6 KiB
ArmAsm
; r12 will be the char of the value of the current ptr
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li64 r12, 0
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; r13 will be the offset into the lisp_expr label
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li64 r13, 0
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;; r253 will be the offset from the stack pointer specified by the spec to be r254
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li64 r253, 0
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; Load first char
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ldr r12, r13, lisp, 1
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loop:
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; zero r15
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li64 r15, 0
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; Check if the char is a (
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li64 r15, 0x28
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; if equal jump to open_paren
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jeq r12, r15, open_paren
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; check if the char is )
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li64 r15, 0x29
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; if equal jump to closed_paren
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jeq r12, r15, closed_paren
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; move the char into r2
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cp r2, r12
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; push the char onto the stack
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jmp push_u64_stack
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; loop :skull:
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jmp loop
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tx
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;; push r2 into the stack
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push_u64_stack:
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;; store r2 -> r254 + r253 with size 8
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st r2, r254, r253, 8
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li64 r252, 8
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add64 r253, r253, r252
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jmp inc_ptr_ld_char
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;; pop the head of the stack into r2
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pop_u64_stack:
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;; load r2 <- r254 + r253 with size 8
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ld r2, r254, r253, 8
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li64 r252, 8
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sub64 r253, r253, r252
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; jmp inc_ptr_ld_char
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inc_ptr_ld_char:
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; inc ptr
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addi64 r13, r13, 1
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; load next char
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ldr r12, r13, lisp, 1
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jmp loop
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open_paren:
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jmp inc_ptr_ld_char
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closed_paren:
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jmp log_lisp_error
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eval_stack:
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jmp log_lisp_error
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lisp:
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.db "(+ 1 2 3 4 5 6 7 8 9 10)"
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.db "(define a (λ () (+ 1 2 3)))"
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.db "(a)"
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builtin_lambda:
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.db "λ"
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builtin_quote:
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.db "'"
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log_lisp_error:
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li64 r1, 3
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li64 r2, 1
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lra16 r3, r0, lisp_error
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li64 r4, 32
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eca
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tx
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lisp_error:
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.db "Some sort of error has occured."
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.db 0
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