/* libgcc routines for M68HC11 & M68HC12.
Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC is free software; you can redistribute it and/or modify it
+GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
.mode mlong
#endif
-#if defined(__USE_RTC__) && defined(mc68hc12)
+ .macro declare_near name
+ .globl \name
+ .type \name,@function
+ .size \name,.Lend-\name
+\name:
+ .endm
+
+#if defined(__USE_RTC__)
# define ARG(N) N+1
.macro ret
+#if defined(mc68hc12)
rtc
+#else
+ jmp __return_32
+#endif
.endm
.macro declare name
;; Specific initialization for 68hc11 before the main.
;; Nothing special for a generic routine; Just enable interrupts.
;;
- declare __premain
+ declare_near __premain
clra
tap ; Clear both I and X.
- ret
+ rts
#endif
#ifdef L__exit
#else
xgdy
tsx
- ldd 4,x
- ldx 2,x ; SRC = X, DST = Y
+ ldd ARG(4),x
+ ldx ARG(2),x ; SRC = X, DST = Y
cpd #0
beq End
pshy
puly ; Restore Y to return the DST
End:
xgdy
- rts
+ ret
#endif
#endif
pulx ; Restore X to return the DST
End:
xgdx
- rts
+ ret
#endif
#endif
#ifdef L_adddi3
- declare ___adddi3
+ declare ___adddi3
tsx
xgdy
ldd ARG(8),x ; Add LSB
addd ARG(16),x
- std ARG(6),y ; Save (carry preserved)
+ std 6,y ; Save (carry preserved)
ldd ARG(6),x
adcb ARG(15),x
adca ARG(14),x
- std ARG(4),y
+ std 4,y
ldd ARG(4),x
adcb ARG(13),x
adca ARG(12),x
- std ARG(2),y
+ std 2,y
ldd ARG(2),x
adcb ARG(11),x ; Add MSB
adca ARG(10),x
- std ARG(0),y
+ std 0,y
xgdy
ret
#endif
#ifdef L_subdi3
- declare ___subdi3
+ declare ___subdi3
tsx
xgdy
ldd ARG(8),x ; Subtract LSB
subd ARG(16),x
- std ARG(6),y ; Save, borrow preserved
+ std 6,y ; Save, borrow preserved
ldd ARG(6),x
sbcb ARG(15),x
sbca ARG(14),x
- std ARG(4),y
+ std 4,y
ldd ARG(4),x
sbcb ARG(13),x
sbca ARG(12),x
- std ARG(2),y
+ std 2,y
ldd ARG(2),x ; Subtract MSB
sbcb ARG(11),x
sbca ARG(10),x
- std ARG(0),y
+ std 0,y
xgdy ;
ret
#endif
#ifdef L_notdi2
- declare ___notdi2
+ declare ___notdi2
tsy
xgdx
ldd ARG(8),y
coma
comb
- std ARG(6),x
+ std 6,x
ldd ARG(6),y
coma
comb
- std ARG(4),x
+ std 4,x
ldd ARG(4),y
coma
comb
- std ARG(2),x
+ std 2,x
ldd ARG(2),y
coma
comb
- std ARG(0),x
+ std 0,x
xgdx
ret
#endif
#ifdef L_negsi2
- .sect .text
- .globl ___negsi2
+ declare_near ___negsi2
-___negsi2:
comb
coma
xgdx
#endif
#ifdef L_one_cmplsi2
- .sect .text
- .globl ___one_cmplsi2
+ declare_near ___one_cmplsi2
-___one_cmplsi2:
comb
coma
xgdx
#endif
#ifdef L_ashlsi3
- .sect .text
- .globl ___ashlsi3
+ declare_near ___ashlsi3
-___ashlsi3:
xgdy
clra
andb #0x1f
#endif
#ifdef L_ashrsi3
- .sect .text
- .globl ___ashrsi3
+ declare_near ___ashrsi3
-___ashrsi3:
xgdy
clra
andb #0x1f
#endif
#ifdef L_lshrsi3
- .sect .text
- .globl ___lshrsi3
+ declare_near ___lshrsi3
-___lshrsi3:
xgdy
clra
andb #0x1f
#endif
#ifdef L_lshrhi3
- .sect .text
- .globl ___lshrhi3
+ declare_near ___lshrhi3
-___lshrhi3:
cpx #16
bge Return_zero
cpx #0
#endif
#ifdef L_lshlhi3
- .sect .text
- .globl ___lshlhi3
+ declare_near ___lshlhi3
-___lshlhi3:
cpx #16
bge Return_zero
cpx #0
#endif
#ifdef L_rotrhi3
- .sect .text
- .globl ___rotrhi3
+ declare_near ___rotrhi3
___rotrhi3:
xgdx
#endif
#ifdef L_rotlhi3
- .sect .text
- .globl ___rotlhi3
+ declare_near ___rotlhi3
___rotlhi3:
xgdx
#endif
#ifdef L_ashrhi3
- .sect .text
- .globl ___ashrhi3
+ declare_near ___ashrhi3
-___ashrhi3:
cpx #16
bge Return_minus_1_or_zero
cpx #0
#endif
#ifdef L_ashrqi3
- .sect .text
- .globl ___ashrqi3
+ declare_near ___ashrqi3
-___ashrqi3:
cmpa #8
bge Return_minus_1_or_zero
tsta
#endif
#ifdef L_lshlqi3
- .sect .text
- .globl ___lshlqi3
+ declare_near ___lshlqi3
-___lshlqi3:
cmpa #8
bge Return_zero
tsta
#ifndef mc68hc12
/* 68HC12 signed divisions are generated inline (idivs). */
- .sect .text
- .globl __divmodhi4
+ declare_near __divmodhi4
;
;; D = numerator
;; Result: D = D / X
;; X = D % X
;;
-__divmodhi4:
tsta
bpl Numerator_pos
comb ; D = -D <=> D = (~D) + 1
#endif
#ifdef L_mulqi3
- .sect .text
- .globl __mulqi3
+ declare_near ___mulqi3
;
; short __mulqi3(signed char a, signed char b);
;
; returns the signed result of A * B in register D.
;
-__mulqi3:
tsta
bmi A_neg
tstb
#endif
#ifdef L_mulhi3
- .sect .text
- .globl ___mulhi3
+ declare_near ___mulhi3
;
;
; a = register D
; b = register X
;
-___mulhi3:
#ifdef mc68hc12
pshx ; Preserve X
exg x,y
; ---
; 91 cycles
#else
- stx _.tmp ; (4/5)
- pshb ; (3)
- ldab _.tmp+1 ; (3/4)
- mul ; (10) B.high * A.low
- xgdx ; (3)
- pulb ; (4)
- stab _.tmp ; (3/4)
- mul ; (10) B.low * A.high
- abx ; (3)
- ldd _.tmp ; (4/5)
- mul ; (10) B.low * A.low
- stx _.tmp ; (4)
- adda _.tmp+1 ; (4/5)
- rts ; (5) 20/26 bytes
- ; ---
- ; 70/76 cycles
-
-#ifdef OLD_MUL
stx *_.tmp ; (4)
pshb ; (3)
ldab *_.tmp+1 ; (3)
#endif
#endif
#endif
-#endif
#ifdef L_mulhi32
; <A-low> 1,x
; <A-high> 0,x
;
- declare __mulhi32
+ declare_near __mulhi32
#ifdef mc68hc12
- ldy ARG(2),sp
+ ldy 2,sp
emul
exg x,y
- ret
+ rts
#else
pshx ; Room for temp value
pshb
exg d,y
ret
#else
-B_low = 8
-B_high = 6
+B_low = ARG(8)
+B_high = ARG(6)
A_low = 0
A_high = 2
pshx
ins
ins
ins
- rts
+ ret
;
;
; A_low_zero_non_optimized:
#ifdef L_far_tramp
#ifdef mc68hc12
- .sect .text
+ .sect .tramp,"ax",@progbits
.globl __far_trampoline
;; This is a trampoline used by the linker to invoke a function
; (whose memory bank is mapped due to the
; call to the trampoline).
#endif
+
+#ifdef mc68hc11
+ .sect .tramp,"ax",@progbits
+ .globl __far_trampoline
+
+;; Trampoline generated by gcc for 68HC11:
+;;
+;; pshb
+;; ldab #%page(func)
+;; ldy #%addr(func)
+;; jmp __far_trampoline
+;;
+__far_trampoline:
+ psha ; (2) Save function parameter (high)
+ ;; <Read current page in A>
+ psha ; (2)
+ ;; <Set currenge page from B>
+ pshx ; (4)
+ tsx ; (3)
+ ldab 4,x ; (4) Restore function parameter (low)
+ ldaa 2,x ; (4) Get saved page number
+ staa 4,x ; (4) Save it below return PC
+ pulx ; (5)
+ pula ; (3)
+ pula ; (3) Restore function parameter (high)
+ jmp 0,y ; (4)
+#endif
+#endif
+
+#ifdef L_call_far
+#ifdef mc68hc11
+ .sect .tramp,"ax",@progbits
+ .globl __call_a16
+ .globl __call_a32
+;;
+;; The call methods are used for 68HC11 to support memory bank switching.
+;; Every far call is redirected to these call methods. Its purpose is to:
+;;
+;; 1/ Save the current page on the stack (1 byte to follow 68HC12 call frame)
+;; 2/ Install the new page
+;; 3/ Jump to the real function
+;;
+;; The page switching (get/save) is board dependent. The default provided
+;; here does nothing (just create the appropriate call frame).
+;;
+;; Call sequence (10 bytes, 13 cycles):
+;;
+;; ldx #page ; (3)
+;; ldy #func ; (4)
+;; jsr __call_a16 ; (6)
+;;
+;; Call trampoline (11 bytes, 19 cycles):
+;;
+__call_a16:
+ ;; xgdx ; (3)
+ ;; <Read current page in A> ; (3) ldaa _current_page
+ psha ; (2)
+ ;; <Set current page from B> ; (4) staa _current_page
+ ;; xgdx ; (3)
+ jmp 0,y ; (4)
+
+;;
+;; Call sequence (10 bytes, 14 cycles):
+;;
+;; pshb ; (2)
+;; ldab #page ; (2)
+;; ldy #func ; (4)
+;; jsr __call_a32 ; (6)
+;;
+;; Call trampoline (87 bytes, 57 cycles):
+;;
+__call_a32:
+ pshx ; (4)
+ psha ; (2)
+ ;; <Read current page in A> ; (3) ldaa _current_page
+ psha ; (2)
+ ;; <Set current page from B> ; (4) staa _current_page
+ tsx ; (3)
+ ldab 6,x ; (4) Restore function parameter
+ ldaa 5,x ; (4) Move PC return at good place
+ staa 6,x ; (4)
+ ldaa 4,x ; (4)
+ staa 5,x ; (4)
+ pula ; (3)
+ staa 4,x ; (4)
+ pula ; (3)
+ pulx ; (5)
+ jmp 0,y ; (4)
+#endif
+#endif
+
+#ifdef L_return_far
+#ifdef mc68hc11
+ .sect .tramp,"ax",@progbits
+ .globl __return_void
+ .globl __return_16
+ .globl __return_32
+
+__return_void:
+ ;; pulb
+ ;; <Set current page from B> (Board specific)
+ ;; rts
+__return_16:
+ ;; xgdx
+ ;; pulb
+ ;; <Set current page from B> (Board specific)
+ ;; xgdx
+ ;; rts
+__return_32:
+ ;; xgdy
+ ;; pulb
+ ;; <Set current page from B> (Board specific)
+ ;; xgdy
+ ;; rts
+ ins
+ rts
+#endif
#endif
.Lend:
;-----------------------------------------
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