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