+// Stack management and unwinding.
+.macro setfp fp=r11, offset=0
+ .if \offset == 0
+ mov \fp, sp
+ .setfp \fp, sp
+ .else
+ add \fp, sp, #\offset
+ .setfp \fp, sp, #\offset
+ .endif
+ .macro dropfp; _dropfp \fp, \offset; .endm
+ .L$_frameptr_p = -1
+.endm
+
+.macro _dropfp fp, offset=0
+ .if \offset == 0
+ mov sp, \fp
+ .else
+ sub sp, \fp, #\offset
+ .endif
+ .purgem dropfp
+ .L$_frameptr_p = 0
+.endm
+
+.macro stalloc n
+ sub sp, sp, #\n
+ .pad #\n
+.endm
+
+.macro stfree n
+ add sp, sp, #\n
+ .pad #-\n
+.endm
+
+.macro pushreg rr:vararg
+ push {\rr}
+ .save {\rr}
+.endm
+
+.macro popreg rr:vararg
+ pop {\rr}
+.endm
+
+.macro pushvfp rr:vararg
+ vstmdb sp!, {\rr}
+ .vsave {\rr}
+.endm
+
+.macro popvfp rr:vararg
+ vldmia sp!, {\rr}
+.endm
+
+.macro endprologue
+.endm
+
+// No need for prologue markers on ARM.
+#define FUNC_POSTHOOK(_) .L$_prologue_p = -1
+
+#endif
+
+///--------------------------------------------------------------------------
+/// AArch64-specific hacking.
+
+#if CPUFAM_ARM64
+
+// Set the function hooks.
+#define FUNC_PREHOOK(_) .balign 4
+#define FUNC_POSTHOOK(_) .cfi_startproc; .L$_prologue_p = -1
+#define ENDFUNC_HOOK(_) .cfi_endproc
+
+// Call external subroutine at ADDR, possibly via PLT.
+.macro callext addr
+ bl \addr
+.endm
+
+// Load address of external symbol ADDR into REG.
+.macro leaext reg, addr
+#if WANT_PIC
+ adrp \reg, :got:\addr
+ ldr \reg, [\reg, #:got_lo12:\addr]
+#else
+ adrp \reg, \addr
+ add \reg, \reg, #:lo12:\addr
+#endif
+.endm
+
+.macro vzero vz=v31
+ // Set VZ (default v31) to zero.
+ dup \vz\().4s, wzr
+.endm
+
+.macro vshl128 vd, vn, nbit, vz=v31
+ // Set VD to VN shifted left by NBIT. Assume VZ (default v31) is
+ // all-bits-zero. NBIT must be a multiple of 8.
+ .if \nbit&3 != 0
+ .error "shift quantity must be whole number of bytes"
+ .endif
+ ext \vd\().16b, \vz\().16b, \vn\().16b, #16 - (\nbit >> 3)
+.endm
+
+.macro vshr128 vd, vn, nbit, vz=v31
+ // Set VD to VN shifted right by NBIT. Assume VZ (default v31) is
+ // all-bits-zero. NBIT must be a multiple of 8.
+ .if \nbit&3 != 0
+ .error "shift quantity must be whole number of bytes"
+ .endif
+ ext \vd\().16b, \vn\().16b, \vz\().16b, #\nbit >> 3
+.endm
+
+// Stack management and unwinding.
+.macro setfp fp=x29, offset=0
+ // If you're just going through the motions with a fixed-size stack frame,
+ // then you want to say `add x29, sp, #OFFSET' directly, which will avoid
+ // pointlessly restoring sp later.
+ .if \offset == 0
+ mov \fp, sp
+ .cfi_def_cfa_register \fp
+ .else
+ add \fp, sp, #\offset
+ .cfi_def_cfa_register \fp
+ .cfi_adjust_cfa_offset -\offset
+ .endif
+ .macro dropfp; _dropfp \fp, \offset; .endm
+ .L$_frameptr_p = -1
+.endm
+
+.macro _dropfp fp, offset=0
+ .if \offset == 0
+ mov sp, \fp
+ .cfi_def_cfa_register sp
+ .else
+ sub sp, \fp, #\offset
+ .cfi_def_cfa_register sp
+ .cfi_adjust_cfa_offset +\offset
+ .endif
+ .purgem dropfp
+ .L$_frameptr_p = 0
+.endm
+
+.macro stalloc n
+ sub sp, sp, #\n
+ .cfi_adjust_cfa_offset +\n
+.endm
+
+.macro stfree n
+ add sp, sp, #\n
+ .cfi_adjust_cfa_offset -\n
+.endm
+
+.macro pushreg x, y=nil
+ .ifeqs "\y", "nil"
+ str \x, [sp, #-16]!
+ .cfi_adjust_cfa_offset +16
+ .cfi_rel_offset \x, 0
+ .else
+ stp \x, \y, [sp, #-16]!
+ .cfi_adjust_cfa_offset +16
+ .cfi_rel_offset \x, 0
+ .cfi_rel_offset \y, 8
+ .endif
+.endm
+
+.macro popreg x, y=nil
+ .ifeqs "\y", "nil"
+ ldr \x, [sp], #16
+ .cfi_restore \x
+ .cfi_adjust_cfa_offset -16
+ .else
+ ldp \x, \y, [sp], #16
+ .cfi_restore \x
+ .cfi_restore \y
+ .cfi_adjust_cfa_offset -16
+ .endif
+.endm
+
+.macro savereg x, y, z=nil
+ .ifeqs "\z", "nil"
+ str \x, [sp, \y]
+ .cfi_rel_offset \x, \y
+ .else
+ stp \x, \y, [sp, #\z]
+ .cfi_rel_offset \x, \z
+ .cfi_rel_offset \y, \z + 8
+ .endif
+.endm
+
+.macro rstrreg x, y, z=nil
+ .ifeqs "\z", "nil"
+ ldr \x, [sp, \y]
+ .cfi_restore \x
+ .else
+ ldp \x, \y, [sp, #\z]
+ .cfi_restore \x
+ .cfi_restore \y
+ .endif
+.endm
+
+.macro endprologue
+.endm
+