mirror of
https://github.com/Ed94/pikuma_ps1.git
synced 2026-06-01 18:41:13 -07:00
ed
e04bcb91b4
Will not be doing most of the course in assembly for now. Assemblers are missing a bunch of ergonomics not related to to instruction abstraction. Mostly related to offset and data typw width calulations and how to ergonomically utilize those symbols within the assembly syntax. The GNU gas macros are terrible and struct member resolution must be done manually. There is no utilities for doing stack allocations with alignment in mind either, no way to get info on the system's calling convention for foreign symbols (not even as a diagnostic, etc). C is a terrible for inline assembly, and gas doesn't support grabbing C struct info from header files (even though they are part of the same toolchain collection). There is no utilities for doing stack allocations with alignment in mind either, no way to get info on the system's calling convention for foreign symbols (not even as a diagnostic, etc). Low-level dev really is in a catch 22 of bad tooling.
180 lines
2.7 KiB
ArmAsm
180 lines
2.7 KiB
ArmAsm
# Symbol Alias Table
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# Instructions
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# Load
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.macro load_addr p1, p2
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la \p1, \p2
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.endm
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.macro load_imm p1, p2
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li \p1, \p2
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.endm
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.macro load_uimm p1, p2
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lui \p1, \p2
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.endm
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.macro load_half p1, p2
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lh \p1, \p2
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.endm
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.macro load_word p1, p2
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lw \p1, \p2
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.endm
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# Store
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.macro store_byte p1, p2
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sb \p1, \p2
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.endm
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.macro store_half p1, p2
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sh \p1, \p2
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.endm
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.macro store_word p1, p2
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sw \p1, \p2
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.endm
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# Shift
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.macro shift_ll p1, p2, p3
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sll \p1, \p2, \p3
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.endm
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.macro shift_rl p1, p2, p3
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srl \p1, \p2, \p3
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.endm
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.macro shift_ra p1, p2, p3
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sra \p1, \p2, \p3
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.endm
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# Addition
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.macro add_s p1, p2, p3
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add \p1, \p2, \p3
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.endm
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.macro add_u p1, p2, p3
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addu \p1, \p2, \p3
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.endm
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.macro add_si p1, p2, p3
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addi \p1, \p2, \p3
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.endm
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.macro add_ui p1, p2, p3
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addiu \p1, \p2, \p3
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.endm
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# Subtraction
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.macro sub_s p1, p2, p3
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sub \p1, \p2, \p3
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.endm
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.macro sub_u p1, p2, p3
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subu \p1, \p2, \p3
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.endm
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# Multiplication
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.macro mult_s p1, p2
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mult \p1, \p2
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.endm
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.macro mult_u p1, p2
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multu \p1, \p2
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.endm
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.macro mult_si p1, p2
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multi \p1, \p2
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.endm
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.macro mult_ui p1, p2
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multui \p1, \p2
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.endm
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# Division
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.macro div_s p1, p2
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div \p1, \p2
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.endm
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.macro div_u p1, p2
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divu \p1, \p2
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.endm
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.macro mov_from_high p1
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mfhi \p1
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.endm
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.macro mov_from_low p1
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mflo \p1
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.endm
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# Branch
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.macro branch_ne_zero p1, p2
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bnez \p1, \p2
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.endm
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.macro branch_equal p1, p2, p3
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beq \p1, \p2, \p3
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.endm
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.macro branch_gt_equal p1, p2, p3
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bge \p1, \p2, \p3
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.endm
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.macro branch_gt p1, p2, p3
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bgt \p1, \p2, \p3
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.endm
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.macro branch_lt p1, p2, p3
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blt \p1, \p2, \p3
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.endm
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# Jump
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.macro jump p1
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j \p1
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.endm
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.macro jump_nlink p1
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jal \p1
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.endm
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.macro jump_reg p1
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jr \p1
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.endm
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.macro jump_nreg p1
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jalr \p1
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.endm
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# Registers
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# Stack
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.equiv rstack_ptr, $sp # I have this but won't really use the alias..
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# Temporaries, may be changed by subroutines
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.set rtmp_0, $t0
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.set rtmp_1, $t1
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.set rtmp_2, $t2
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.set rtmp_3, $t3
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.set rtmp_4, $t4
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# Static Variables
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.set rstatic_0, $s0
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.set rstatic_1, $s1
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.set rstatic_2, $s2
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.set rstatic_3, $s3
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.set rstatic_4, $s4
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.set rstatic_5, $s5
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.set rstatic_6, $s6
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.set rstatic_7, $s7
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# Subroutine arguments
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.set rarg_0, $a0
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.set rarg_1, $a1
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.set rarg_2, $a2
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.set rarg_3, $a3
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# Subroutine return values
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.set rret_0, $v0
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.set rret_1, $v1
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# Subroutine return address when doing a sub
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.set rret_addr, $ra
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.macro align8 size
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(\size + 7) & ~7
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.endm
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.macro def_cf_sp_size size
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.set cf_ssize, (\size + 7) & ~7
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.endm
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.macro stack_alloc amount
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add_ui $sp, $sp, - \amount
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.endm
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.macro stack_release amount
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add_ui $sp, $sp, \amount
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.endm
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# Data Widths
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.set byte, 1
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.set word, 4
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.equ U8, 1
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.equ S8, 1
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.equ U16, 2
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.equ S16, 2
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.equ U32, 4
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.equ S32, 4
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.equ SSIZE, 4
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.equ USIZE, 4
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.equ B8, S8
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.equ B16, S16
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.equ B32, S32
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.equ false, 0
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.equ true, 1
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.equ true_overflow, 3
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