mirror of
https://github.com/pkivolowitz/asm_book.git
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151 lines
3.3 KiB
ArmAsm
151 lines
3.3 KiB
ArmAsm
/* Macros to permit the "same" assembly language to build on ARM64
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Linux systems as well as Apple Silicon systems.
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See the fuller documentation at:
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https://github.com/pkivolowitz/asm_book/blob/main/macros/README.md
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Perry Kivolowitz
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A Gentle Introduction to Assembly Language
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*/
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.macro GLD_PTR xreg, label
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#if defined(__APPLE__)
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adrp \xreg, _\label@GOTPAGE
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ldr \xreg, [\xreg, _\label@GOTPAGEOFF]
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#else
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ldr \xreg, =\label
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ldr \xreg, [\xreg]
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#endif
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.endm
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.macro GLD_ADDR xreg, label // Get a global address
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#if defined(__APPLE__)
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adrp \xreg, _\label@GOTPAGE
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add \xreg, \xreg, _\label@GOTPAGEOFF
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#else
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ldr \xreg, =\label
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#endif
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.endm
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.macro LLD_ADDR xreg, label
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#if defined(__APPLE__)
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adrp \xreg, \label@PAGE
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add \xreg, \xreg, \label@PAGEOFF
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#else
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ldr \xreg, =\label
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#endif
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.endm
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.macro LLD_DBL xreg, dreg, label
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#if defined(__APPLE__)
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adrp \xreg, \label@PAGE
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add \xreg, \xreg, \label@PAGEOFF
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ldur \dreg, [\xreg]
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// fmov \dreg, \xreg
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#else
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ldr \xreg, =\label
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ldur \dreg, [\xreg]
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#endif
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.endm
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.macro LLD_FLT xreg, sreg, label
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#if defined(__APPLE__)
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adrp \xreg, \label@PAGE
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add \xreg, \xreg, \label@PAGEOFF
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ldur \sreg, [\xreg]
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#else
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ldr \xreg, =\label
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ldur \sreg, [\xreg]
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#endif
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.endm
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.macro GLABEL label
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#if defined(__APPLE__)
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.global _\label
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#else
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.global \label
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#endif
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.endm
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.macro MAIN
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#if defined(__APPLE__)
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_main:
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#else
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main:
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#endif
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.endm
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/* Fetching the address of the externally defined errno is quite
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different on Apple and Linux. This macro leaves the address of
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errno in x0.
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*/
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.macro ERRNO_ADDR
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#if defined(__APPLE__)
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bl ___error
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#else
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bl __errno_location
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#endif
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.endm
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.macro CRT label
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#if defined(__APPLE__)
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bl _\label
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#else
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bl \label
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#endif
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.endm
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.macro START_PROC // after starting label
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.cfi_startproc
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.endm
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.macro END_PROC // after the return
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.cfi_endproc
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.endm
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.macro PUSH_P a, b
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stp \a, \b, [sp, -16]!
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.endm
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.macro PUSH_R a
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str \a, [sp, -16]!
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.endm
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.macro POP_P a, b
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ldp \a, \b, [sp], 16
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.endm
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.macro POP_R a
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ldr \a, [sp], 16
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.endm
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/* The smaller of src_a and src_b is put into dest. A cmp instruction
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or other instruction that sets the flags must be performed first.
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This macro makes it easy to remember which register does what in the
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csel.
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Thank you to u/TNorthover for nudge to add the cmp.
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*/
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.macro MIN src_a, src_b, dest
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cmp \src_a, \src_b
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csel \dest, \src_a, \src_b, LT
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.endm
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/* The larger of src_a and src_b is put into dest. A cmp instruction
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or other instruction that sets the flags must be performed first.
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This macro makes it easy to remember which register does what in the
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csel.
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Thank you to u/TNorthover for nudge to add the cmp.
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*/
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.macro MAX src_a, src_b, dest
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cmp \src_a, \src_b
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csel \dest, \src_a, \src_b, GT
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.endm
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.macro AASCIZ label, string
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.p2align 2
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\label: .asciz "\string"
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.endm
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