ref: 21674aabd645829b4be407b084e399c46f5ccd6f
parent: 413609195feb8bd92c45204536c925a1006cba9e
author: Roberto E. Vargas Caballero <k0ga@shike2.com>
date: Sat Sep 21 15:50:40 EDT 2019
[as-powerpc] Add BC instructions These are conditional branch instructions
--- a/src/cmd/as/target/powerpc/ins.c
+++ b/src/cmd/as/target/powerpc/ins.c
@@ -79,6 +79,7 @@
if ((getclass(np) & class) == 0)
return 0;
break;
+ case AIMM5:
case AIMM8:
case AIMM16:
case AIMM32:
@@ -160,7 +161,31 @@
void
b_form(Op *op, Node **args)
{- abort();
+ unsigned long ins, opcd, bo, bi, bd, aa, lk;
+ long long dst;
+ long long max = 1l << 13;
+ long long min = -(1l << 13);
+
+ opcd = op->bytes[0];
+ aa = op->bytes[1];
+ lk = op->bytes[2];
+
+ bo = args[0]->sym->value;
+ bi = args[1]->sym->value;
+
+ dst = args[2]->sym->value;
+ if (dst & 0x3)
+ error("unaligned branch");+ if (aa)
+ dst -= cursec->curpc - 4;
+
+ if (dst < min || dst > max)
+ error("out of range branch");+ bd = dst;
+ bd >>= 2;
+
+ ins = opcd<<26 | bo<<21 | bi<<16 | bd<<11 | aa<<1 | lk;
+ emit_packed(ins);
}
void
--- a/src/cmd/as/target/powerpc/powerpc.dat
+++ b/src/cmd/as/target/powerpc/powerpc.dat
@@ -45,3 +45,12 @@
BL imm64 4 18,0,1 i_form POWERPC64
BLA imm32 4 18,1,1 i_form POWERPC
BLA imm64 4 18,1,1 i_form POWERPC64
+
+BC imm5,imm5,imm32 4 16,0,0 b_form POWERPC
+BC imm5,imm5,imm64 4 16,0,0 b_form POWERPC64
+BCA imm5,imm5,imm32 4 16,1,0 b_form POWERPC
+BCA imm5,imm5,imm64 4 16,1,0 b_form POWERPC64
+BCL imm5,imm5,imm32 4 16,0,1 b_form POWERPC
+BCL imm5,imm5,imm64 4 16,0,1 b_form POWERPC64
+BCLA imm5,imm5,imm32 4 16,1,1 b_form POWERPC
+BCLA imm5,imm5,imm64 4 16,1,1 b_form POWERPC64
--- a/src/cmd/as/target/powerpc/rules.dat
+++ b/src/cmd/as/target/powerpc/rules.dat
@@ -1,3 +1,4 @@
+imm5 AIMM5
imm8 AIMM8
imm16 AIMM16
imm32 AIMM32
--- a/tests/as/execute/powerpc.s
+++ b/tests/as/execute/powerpc.s
@@ -2,3 +2,8 @@
BA $L1 / 48 00 00 0E
BL $L1 / 48 00 00 0D
L1: BLA $L1 / 48 00 00 07
+
+ BC $3,$2,$L2 / 40 62 38 00
+ BCA $2,$1,$L2 / 40 41 18 02
+ BCL $1,$3,$L2 / 40 23 38 01
+L2: BCLA $3,$4,$L2 / 40 64 08 03