/* libgcc routines for the MCore. Copyright (C) 1993-2014 Free Software Foundation, Inc. This file is part of GCC. 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 3, or (at your option) any later version. This file is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see . */ #define CONCAT1(a, b) CONCAT2(a, b) #define CONCAT2(a, b) a ## b /* Use the right prefix for global labels. */ #define SYM(x) CONCAT1 (__, x) #ifdef __ELF__ #define TYPE(x) .type SYM (x),@function #define SIZE(x) .size SYM (x), . - SYM (x) #else #define TYPE(x) #define SIZE(x) #endif .macro FUNC_START name .text .globl SYM (\name) TYPE (\name) SYM (\name): .endm .macro FUNC_END name SIZE (\name) .endm #ifdef L_udivsi3 FUNC_START udiv32 FUNC_START udivsi32 movi r1,0 // r1-r2 form 64 bit dividend movi r4,1 // r4 is quotient (1 for a sentinel) cmpnei r3,0 // look for 0 divisor bt 9f trap 3 // divide by 0 9: // control iterations; skip across high order 0 bits in dividend mov r7,r2 cmpnei r7,0 bt 8f movi r2,0 // 0 dividend jmp r15 // quick return 8: ff1 r7 // figure distance to skip lsl r4,r7 // move the sentinel along (with 0's behind) lsl r2,r7 // and the low 32 bits of numerator // appears to be wrong... // tested out incorrectly in our OS work... // mov r7,r3 // looking at divisor // ff1 r7 // I can move 32-r7 more bits to left. // addi r7,1 // ok, one short of that... // mov r1,r2 // lsr r1,r7 // bits that came from low order... // rsubi r7,31 // r7 == "32-n" == LEFT distance // addi r7,1 // this is (32-n) // lsl r4,r7 // fixes the high 32 (quotient) // lsl r2,r7 // cmpnei r4,0 // bf 4f // the sentinel went away... // run the remaining bits 1: lslc r2,1 // 1 bit left shift of r1-r2 addc r1,r1 cmphs r1,r3 // upper 32 of dividend >= divisor? bf 2f sub r1,r3 // if yes, subtract divisor 2: addc r4,r4 // shift by 1 and count subtracts bf 1b // if sentinel falls out of quotient, stop 4: mov r2,r4 // return quotient mov r3,r1 // and piggyback the remainder jmp r15 FUNC_END udiv32 FUNC_END udivsi32 #endif #ifdef L_umodsi3 FUNC_START urem32 FUNC_START umodsi3 movi r1,0 // r1-r2 form 64 bit dividend movi r4,1 // r4 is quotient (1 for a sentinel) cmpnei r3,0 // look for 0 divisor bt 9f trap 3 // divide by 0 9: // control iterations; skip across high order 0 bits in dividend mov r7,r2 cmpnei r7,0 bt 8f movi r2,0 // 0 dividend jmp r15 // quick return 8: ff1 r7 // figure distance to skip lsl r4,r7 // move the sentinel along (with 0's behind) lsl r2,r7 // and the low 32 bits of numerator 1: lslc r2,1 // 1 bit left shift of r1-r2 addc r1,r1 cmphs r1,r3 // upper 32 of dividend >= divisor? bf 2f sub r1,r3 // if yes, subtract divisor 2: addc r4,r4 // shift by 1 and count subtracts bf 1b // if sentinel falls out of quotient, stop mov r2,r1 // return remainder jmp r15 FUNC_END urem32 FUNC_END umodsi3 #endif #ifdef L_divsi3 FUNC_START div32 FUNC_START divsi3 mov r5,r2 // calc sign of quotient xor r5,r3 abs r2 // do unsigned divide abs r3 movi r1,0 // r1-r2 form 64 bit dividend movi r4,1 // r4 is quotient (1 for a sentinel) cmpnei r3,0 // look for 0 divisor bt 9f trap 3 // divide by 0 9: // control iterations; skip across high order 0 bits in dividend mov r7,r2 cmpnei r7,0 bt 8f movi r2,0 // 0 dividend jmp r15 // quick return 8: ff1 r7 // figure distance to skip lsl r4,r7 // move the sentinel along (with 0's behind) lsl r2,r7 // and the low 32 bits of numerator // tested out incorrectly in our OS work... // mov r7,r3 // looking at divisor // ff1 r7 // I can move 32-r7 more bits to left. // addi r7,1 // ok, one short of that... // mov r1,r2 // lsr r1,r7 // bits that came from low order... // rsubi r7,31 // r7 == "32-n" == LEFT distance // addi r7,1 // this is (32-n) // lsl r4,r7 // fixes the high 32 (quotient) // lsl r2,r7 // cmpnei r4,0 // bf 4f // the sentinel went away... // run the remaining bits 1: lslc r2,1 // 1 bit left shift of r1-r2 addc r1,r1 cmphs r1,r3 // upper 32 of dividend >= divisor? bf 2f sub r1,r3 // if yes, subtract divisor 2: addc r4,r4 // shift by 1 and count subtracts bf 1b // if sentinel falls out of quotient, stop 4: mov r2,r4 // return quotient mov r3,r1 // piggyback the remainder btsti r5,31 // after adjusting for sign bf 3f rsubi r2,0 rsubi r3,0 3: jmp r15 FUNC_END div32 FUNC_END divsi3 #endif #ifdef L_modsi3 FUNC_START rem32 FUNC_START modsi3 mov r5,r2 // calc sign of remainder abs r2 // do unsigned divide abs r3 movi r1,0 // r1-r2 form 64 bit dividend movi r4,1 // r4 is quotient (1 for a sentinel) cmpnei r3,0 // look for 0 divisor bt 9f trap 3 // divide by 0 9: // control iterations; skip across high order 0 bits in dividend mov r7,r2 cmpnei r7,0 bt 8f movi r2,0 // 0 dividend jmp r15 // quick return 8: ff1 r7 // figure distance to skip lsl r4,r7 // move the sentinel along (with 0's behind) lsl r2,r7 // and the low 32 bits of numerator 1: lslc r2,1 // 1 bit left shift of r1-r2 addc r1,r1 cmphs r1,r3 // upper 32 of dividend >= divisor? bf 2f sub r1,r3 // if yes, subtract divisor 2: addc r4,r4 // shift by 1 and count subtracts bf 1b // if sentinel falls out of quotient, stop mov r2,r1 // return remainder btsti r5,31 // after adjusting for sign bf 3f rsubi r2,0 3: jmp r15 FUNC_END rem32 FUNC_END modsi3 #endif /* GCC expects that {__eq,__ne,__gt,__ge,__le,__lt}{df2,sf2} will behave as __cmpdf2. So, we stub the implementations to jump on to __cmpdf2 and __cmpsf2. All of these shortcircuit the return path so that __cmp{sd}f2 will go directly back to the caller. */ .macro COMPARE_DF_JUMP name .import SYM (cmpdf2) FUNC_START \name jmpi SYM (cmpdf2) FUNC_END \name .endm #ifdef L_eqdf2 COMPARE_DF_JUMP eqdf2 #endif /* L_eqdf2 */ #ifdef L_nedf2 COMPARE_DF_JUMP nedf2 #endif /* L_nedf2 */ #ifdef L_gtdf2 COMPARE_DF_JUMP gtdf2 #endif /* L_gtdf2 */ #ifdef L_gedf2 COMPARE_DF_JUMP gedf2 #endif /* L_gedf2 */ #ifdef L_ltdf2 COMPARE_DF_JUMP ltdf2 #endif /* L_ltdf2 */ #ifdef L_ledf2 COMPARE_DF_JUMP ledf2 #endif /* L_ledf2 */ /* SINGLE PRECISION FLOATING POINT STUBS */ .macro COMPARE_SF_JUMP name .import SYM (cmpsf2) FUNC_START \name jmpi SYM (cmpsf2) FUNC_END \name .endm #ifdef L_eqsf2 COMPARE_SF_JUMP eqsf2 #endif /* L_eqsf2 */ #ifdef L_nesf2 COMPARE_SF_JUMP nesf2 #endif /* L_nesf2 */ #ifdef L_gtsf2 COMPARE_SF_JUMP gtsf2 #endif /* L_gtsf2 */ #ifdef L_gesf2 COMPARE_SF_JUMP __gesf2 #endif /* L_gesf2 */ #ifdef L_ltsf2 COMPARE_SF_JUMP __ltsf2 #endif /* L_ltsf2 */ #ifdef L_lesf2 COMPARE_SF_JUMP lesf2 #endif /* L_lesf2 */