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DynASM/PPC: Add support for parameterized shifts/masks.

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This commit is contained in:
Mike Pall
2015-04-12 01:25:14 +02:00
parent dec4acca9a
commit b2a5cc8233
2 changed files with 14 additions and 6 deletions
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11
dynasm/dasm_ppc.h
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@@ -21,7 +21,7 @@ enum {
/* The following actions need a buffer position. */
DASM_ALIGN, DASM_REL_LG, DASM_LABEL_LG,
/* The following actions also have an argument. */
DASM_REL_PC, DASM_LABEL_PC, DASM_IMM,
DASM_REL_PC, DASM_LABEL_PC, DASM_IMM, DASM_IMMSH,
DASM__MAX
};
@@ -244,6 +244,10 @@ void dasm_put(Dst_DECL, int start, ...)
#endif
b[pos++] = n;
break;
case DASM_IMMSH:
CK((n >> 6) == 0, RANGE_I);
b[pos++] = n;
break;
}
}
}
@@ -299,7 +303,7 @@ int dasm_link(Dst_DECL, size_t *szp)
case DASM_ALIGN: ofs -= (b[pos++] + ofs) & (ins & 255); break;
case DASM_REL_LG: case DASM_REL_PC: pos++; break;
case DASM_LABEL_LG: case DASM_LABEL_PC: b[pos++] += ofs; break;
case DASM_IMM: pos++; break;
case DASM_IMM: case DASM_IMMSH: pos++; break;
}
}
stop: (void)0;
@@ -366,6 +370,9 @@ int dasm_encode(Dst_DECL, void *buffer)
case DASM_IMM:
cp[-1] |= (n & ((1<<((ins>>5)&31))-1)) << (ins&31);
break;
case DASM_IMMSH:
cp[-1] |= (ins & 1) ? ((n&31)<<11)|((n&32)>>4) : ((n&31)<<6)|(n&32);
break;
default: *cp++ = ins; break;
}
}