ref: a0e34a8b86c340b8b3517c6dbdcde1de8c8ca39a
dir: /src/cmd/as/target/powerpc/ins.c/
#include <stdlib.h> #include <scc/scc.h> #include "../../as.h" #include "proc.h" /* * This code is derived from PowerISA_V2.06B_V2_PUBLIC document. * All the names used in the specification are preserved in * this code. */ static int getclass(Node *np) { if (np->addr != AREG) return 0; switch (np->sym->value) { case AREG_R0: case AREG_R1: case AREG_R2: case AREG_R3: case AREG_R4: case AREG_R5: case AREG_R6: case AREG_R7: case AREG_R8: case AREG_R9: case AREG_R10: case AREG_R11: case AREG_R12: case AREG_R13: case AREG_R14: case AREG_R15: case AREG_R16: case AREG_R17: case AREG_R18: case AREG_R19: case AREG_R20: case AREG_R21: case AREG_R22: case AREG_R23: case AREG_R24: case AREG_R25: case AREG_R26: case AREG_R27: case AREG_R29: case AREG_R30: case AREG_R31: return GPRSCLASS; default: abort(); } } int match(Op *op, Node **args) { unsigned char *p; int arg, class, rep, opt; Node *np; if (!op->args) return args == NULL; opt = rep = 0; for (p = op->args; arg = *p; ++p) { if (rep) --p; if ((np = *args++) == NULL) return (rep|opt) != 0; switch (arg) { case AOPT: opt = 1; break; case AREP: rep = 1; break; case AREG_GPRSCLASS: class = GPRSCLASS; check_class: if ((getclass(np) & class) == 0) return 0; break; case AIMM2: case AIMM5: case AIMM8: case AIMM16: case AIMM32: case AIMM64: if (np->addr != AIMM) return 0; if (toobig(np, arg)) error("overflow in immediate operand"); break; case ASYM: if (np->addr != AIMM || np->op != IDEN) return 0; break; case ADIRECT: case ASTR: if (np->addr != arg) return 0; break; default: abort(); } } return *args == NULL; } Node * moperand(void) { abort(); } static void emit_packed(unsigned long ins) { char buff[4]; if (endian == BIG_ENDIAN) { buff[0] = ins >> 24; buff[1] = ins >> 16; buff[2] = ins >> 8; buff[3] = ins; } else { buff[0] = ins; buff[1] = ins >> 8; buff[2] = ins >> 16; buff[3] = ins >> 24; } emit(buff, 4); } void i_form(Op *op, Node **args) { unsigned long ins, opcd, li, aa, lk; long long dst; long long max = 1l << 23; long long min = -(1l << 23); opcd = op->bytes[0]; aa = op->bytes[1]; lk = op->bytes[2]; dst = args[0]->sym->value; if (dst & 0x3) error("unaligned branch"); if (aa) dst -= cursec->curpc - 4; if (dst < min || dst > max) error("out of range branch"); li = dst; li >>= 2; ins = opcd<<26 | li<<2 | aa<<1 | lk; emit_packed(ins); } void b_form(Op *op, Node **args) { 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 sc_form(Op *op, Node **args) { abort(); } void d_form(Op *op, Node **args) { abort(); } void ds_form(Op *op, Node **args) { abort(); } void dq_form(Op *op, Node **args) { abort(); } void x_form(Op *op, Node **args) { abort(); } void xl_form(Op *op, Node **args) { unsigned long ins, bo, bi, bh, lk; unsigned long opcd1, opcd2; long long dst; opcd1 = op->bytes[0]; opcd2 = op->bytes[1]<<8 | op->bytes[2]; lk = op->bytes[3]; bo = args[0]->sym->value; bi = args[1]->sym->value; bh = args[2]->sym->value; ins = opcd1<<26 | bo<<21 | bi<<16 | bh<<11 | opcd2<<1 | lk; emit_packed(ins); } void xfx_form(Op *op, Node **args) { abort(); } void xlfdorm_form(Op *op, Node **args) { abort(); } void xx1_form(Op *op, Node **args) { abort(); } void xx2_form(Op *op, Node **args) { abort(); } void xx3_form(Op *op, Node **args) { abort(); } void xx4_form(Op *op, Node **args) { abort(); } void xs_form(Op *op, Node **args) { abort(); } void xo_form(Op *op, Node **args) { abort(); } void a_form(Op *op, Node **args) { abort(); } void m_form(Op *op, Node **args) { abort(); } void md_form(Op *op, Node **args) { abort(); } void mds_form(Op *op, Node **args) { abort(); } void va_form(Op *op, Node **args) { abort(); } void vc_form(Op *op, Node **args) { abort(); } void vx_form(Op *op, Node **args) { abort(); } void evs_form(Op *op, Node **args) { abort(); } void z22_form(Op *op, Node **args) { abort(); } void z23_form(Op *op, Node **args) { abort(); }