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1 // Copyright (c) 1994-2006 Sun Microsystems Inc. | 1 // Copyright (c) 1994-2006 Sun Microsystems Inc. |
2 // All Rights Reserved. | 2 // All Rights Reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions are | 5 // modification, are permitted provided that the following conditions are |
6 // met: | 6 // met: |
7 // | 7 // |
8 // - Redistributions of source code must retain the above copyright notice, | 8 // - Redistributions of source code must retain the above copyright notice, |
9 // this list of conditions and the following disclaimer. | 9 // this list of conditions and the following disclaimer. |
10 // | 10 // |
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2191 // li sequence with nops. | 2191 // li sequence with nops. |
2192 // This optimization can only be applied if the rt-code from instr2 is the | 2192 // This optimization can only be applied if the rt-code from instr2 is the |
2193 // register used for the jalr/jr. Finally, we have to skip 'jr ra', which is | 2193 // register used for the jalr/jr. Finally, we have to skip 'jr ra', which is |
2194 // mips return. Occasionally this lands after an li(). | 2194 // mips return. Occasionally this lands after an li(). |
2195 | 2195 |
2196 Instr instr3 = instr_at(pc + 2 * kInstrSize); | 2196 Instr instr3 = instr_at(pc + 2 * kInstrSize); |
2197 uint32_t ipc = reinterpret_cast<uint32_t>(pc + 3 * kInstrSize); | 2197 uint32_t ipc = reinterpret_cast<uint32_t>(pc + 3 * kInstrSize); |
2198 bool in_range = (ipc ^ static_cast<uint32_t>(itarget) >> | 2198 bool in_range = (ipc ^ static_cast<uint32_t>(itarget) >> |
2199 (kImm26Bits + kImmFieldShift)) == 0; | 2199 (kImm26Bits + kImmFieldShift)) == 0; |
2200 uint32_t target_field = | 2200 uint32_t target_field = |
2201 static_cast<uint32_t>(itarget & kJumpAddrMask) >>kImmFieldShift; | 2201 static_cast<uint32_t>(itarget & kJumpAddrMask) >> kImmFieldShift; |
2202 bool patched_jump = false; | 2202 bool patched_jump = false; |
2203 | 2203 |
2204 #ifndef ALLOW_JAL_IN_BOUNDARY_REGION | 2204 #ifndef ALLOW_JAL_IN_BOUNDARY_REGION |
2205 // This is a workaround to the 24k core E156 bug (affect some 34k cores also). | 2205 // This is a workaround to the 24k core E156 bug (affect some 34k cores also). |
2206 // Since the excluded space is only 64KB out of 256MB (0.02 %), we will just | 2206 // Since the excluded space is only 64KB out of 256MB (0.02 %), we will just |
2207 // apply this workaround for all cores so we don't have to identify the core. | 2207 // apply this workaround for all cores so we don't have to identify the core. |
2208 if (in_range) { | 2208 if (in_range) { |
2209 // The 24k core E156 bug has some very specific requirements, we only check | 2209 // The 24k core E156 bug has some very specific requirements, we only check |
2210 // the most simple one: if the address of the delay slot instruction is in | 2210 // the most simple one: if the address of the delay slot instruction is in |
2211 // the first or last 32 KB of the 256 MB segment. | 2211 // the first or last 32 KB of the 256 MB segment. |
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2286 } | 2286 } |
2287 | 2287 |
2288 if (patched) { | 2288 if (patched) { |
2289 CPU::FlushICache(pc+2, sizeof(Address)); | 2289 CPU::FlushICache(pc+2, sizeof(Address)); |
2290 } | 2290 } |
2291 } | 2291 } |
2292 | 2292 |
2293 } } // namespace v8::internal | 2293 } } // namespace v8::internal |
2294 | 2294 |
2295 #endif // V8_TARGET_ARCH_MIPS | 2295 #endif // V8_TARGET_ARCH_MIPS |
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