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https://github.com/ZDoom/gzdoom.git
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230 lines
4 KiB
C
230 lines
4 KiB
C
/* Bra.c -- Converters for RISC code
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2017-04-04 : Igor Pavlov : Public domain */
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#include "Precomp.h"
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#include "CpuArch.h"
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#include "Bra.h"
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SizeT ARM_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
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{
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Byte *p;
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const Byte *lim;
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size &= ~(size_t)3;
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ip += 4;
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p = data;
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lim = data + size;
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if (encoding)
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for (;;)
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{
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for (;;)
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{
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if (p >= lim)
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return p - data;
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p += 4;
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if (p[-1] == 0xEB)
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break;
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}
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{
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UInt32 v = GetUi32(p - 4);
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v <<= 2;
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v += ip + (UInt32)(p - data);
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v >>= 2;
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v &= 0x00FFFFFF;
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v |= 0xEB000000;
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SetUi32(p - 4, v);
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}
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}
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for (;;)
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{
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for (;;)
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{
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if (p >= lim)
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return p - data;
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p += 4;
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if (p[-1] == 0xEB)
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break;
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}
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{
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UInt32 v = GetUi32(p - 4);
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v <<= 2;
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v -= ip + (UInt32)(p - data);
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v >>= 2;
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v &= 0x00FFFFFF;
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v |= 0xEB000000;
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SetUi32(p - 4, v);
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}
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}
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}
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SizeT ARMT_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
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{
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Byte *p;
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const Byte *lim;
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size &= ~(size_t)1;
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p = data;
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lim = data + size - 4;
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if (encoding)
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for (;;)
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{
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UInt32 b1;
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for (;;)
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{
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UInt32 b3;
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if (p > lim)
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return p - data;
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b1 = p[1];
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b3 = p[3];
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p += 2;
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b1 ^= 8;
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if ((b3 & b1) >= 0xF8)
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break;
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}
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{
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UInt32 v =
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((UInt32)b1 << 19)
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+ (((UInt32)p[1] & 0x7) << 8)
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+ (((UInt32)p[-2] << 11))
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+ (p[0]);
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p += 2;
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{
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UInt32 cur = (ip + (UInt32)(p - data)) >> 1;
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v += cur;
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}
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p[-4] = (Byte)(v >> 11);
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p[-3] = (Byte)(0xF0 | ((v >> 19) & 0x7));
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p[-2] = (Byte)v;
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p[-1] = (Byte)(0xF8 | (v >> 8));
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}
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}
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for (;;)
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{
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UInt32 b1;
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for (;;)
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{
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UInt32 b3;
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if (p > lim)
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return p - data;
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b1 = p[1];
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b3 = p[3];
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p += 2;
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b1 ^= 8;
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if ((b3 & b1) >= 0xF8)
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break;
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}
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{
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UInt32 v =
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((UInt32)b1 << 19)
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+ (((UInt32)p[1] & 0x7) << 8)
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+ (((UInt32)p[-2] << 11))
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+ (p[0]);
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p += 2;
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{
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UInt32 cur = (ip + (UInt32)(p - data)) >> 1;
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v -= cur;
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}
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/*
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SetUi16(p - 4, (UInt16)(((v >> 11) & 0x7FF) | 0xF000));
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SetUi16(p - 2, (UInt16)(v | 0xF800));
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*/
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p[-4] = (Byte)(v >> 11);
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p[-3] = (Byte)(0xF0 | ((v >> 19) & 0x7));
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p[-2] = (Byte)v;
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p[-1] = (Byte)(0xF8 | (v >> 8));
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}
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}
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}
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SizeT PPC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
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{
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Byte *p;
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const Byte *lim;
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size &= ~(size_t)3;
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ip -= 4;
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p = data;
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lim = data + size;
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for (;;)
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{
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for (;;)
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{
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if (p >= lim)
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return p - data;
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p += 4;
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/* if ((v & 0xFC000003) == 0x48000001) */
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if ((p[-4] & 0xFC) == 0x48 && (p[-1] & 3) == 1)
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break;
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}
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{
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UInt32 v = GetBe32(p - 4);
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if (encoding)
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v += ip + (UInt32)(p - data);
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else
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v -= ip + (UInt32)(p - data);
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v &= 0x03FFFFFF;
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v |= 0x48000000;
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SetBe32(p - 4, v);
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}
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}
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}
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SizeT SPARC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
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{
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Byte *p;
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const Byte *lim;
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size &= ~(size_t)3;
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ip -= 4;
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p = data;
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lim = data + size;
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for (;;)
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{
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for (;;)
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{
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if (p >= lim)
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return p - data;
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/*
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v = GetBe32(p);
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p += 4;
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m = v + ((UInt32)5 << 29);
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m ^= (UInt32)7 << 29;
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m += (UInt32)1 << 22;
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if ((m & ((UInt32)0x1FF << 23)) == 0)
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break;
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*/
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p += 4;
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if ((p[-4] == 0x40 && (p[-3] & 0xC0) == 0) ||
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(p[-4] == 0x7F && (p[-3] >= 0xC0)))
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break;
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}
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{
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UInt32 v = GetBe32(p - 4);
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v <<= 2;
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if (encoding)
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v += ip + (UInt32)(p - data);
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else
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v -= ip + (UInt32)(p - data);
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v &= 0x01FFFFFF;
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v -= (UInt32)1 << 24;
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v ^= 0xFF000000;
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v >>= 2;
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v |= 0x40000000;
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SetBe32(p - 4, v);
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}
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}
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}
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