| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sts=4 et sw=4 tw=99: |
| * This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| #include "jit/arm/Architecture-arm.h" |
| |
| #if !defined(JS_ARM_SIMULATOR) && !defined(__APPLE__) |
| #include <elf.h> |
| #endif |
| |
| #include <fcntl.h> |
| #include <unistd.h> |
| |
| #include "jit/arm/Assembler-arm.h" |
| #include "jit/RegisterSets.h" |
| |
| #if !defined(__linux__) || defined(ANDROID) || defined(JS_SIMULATOR_ARM) |
| // The Android NDK and B2G do not include the hwcap.h kernel header, and it is not |
| // defined when building the simulator, so inline the header defines we need. |
| # define HWCAP_VFP (1 << 6) |
| # define HWCAP_NEON (1 << 12) |
| # define HWCAP_VFPv3 (1 << 13) |
| # define HWCAP_VFPv3D16 (1 << 14) /* also set for VFPv4-D16 */ |
| # define HWCAP_VFPv4 (1 << 16) |
| # define HWCAP_IDIVA (1 << 17) |
| # define HWCAP_IDIVT (1 << 18) |
| # define HWCAP_VFPD32 (1 << 19) /* set if VFP has 32 regs (not 16) */ |
| # define AT_HWCAP 16 |
| #else |
| # include <asm/hwcap.h> |
| # if !defined(HWCAP_IDIVA) |
| # define HWCAP_IDIVA (1 << 17) |
| # endif |
| # if !defined(HWCAP_VFPD32) |
| # define HWCAP_VFPD32 (1 << 19) /* set if VFP has 32 regs (not 16) */ |
| # endif |
| #endif |
| |
| namespace js { |
| namespace jit { |
| |
| |
| // Parse the Linux kernel cpuinfo features. This is also used to parse the |
| // override features which has some extensions: 'armv7', 'align' and 'hardfp'. |
| static uint32_t |
| ParseARMCpuFeatures(const char* features, bool override = false) |
| { |
| uint32_t flags = 0; |
| |
| for (;;) { |
| char ch = *features; |
| if (!ch) { |
| // End of string. |
| break; |
| } |
| if (ch == ' ' || ch == ',') { |
| // Skip separator characters. |
| features++; |
| continue; |
| } |
| // Find the end of the token. |
| const char* end = features + 1; |
| for (; ; end++) { |
| ch = *end; |
| if (!ch || ch == ' ' || ch == ',') |
| break; |
| } |
| size_t count = end - features; |
| if (count == 3 && strncmp(features, "vfp", 3) == 0) |
| flags |= HWCAP_VFP; |
| else if (count == 4 && strncmp(features, "neon", 4) == 0) |
| flags |= HWCAP_NEON; |
| else if (count == 5 && strncmp(features, "vfpv3", 5) == 0) |
| flags |= HWCAP_VFPv3; |
| else if (count == 8 && strncmp(features, "vfpv3d16", 8) == 0) |
| flags |= HWCAP_VFPv3D16; |
| else if (count == 5 && strncmp(features, "vfpv4", 5) == 0) |
| flags |= HWCAP_VFPv4; |
| else if (count == 5 && strncmp(features, "idiva", 5) == 0) |
| flags |= HWCAP_IDIVA; |
| else if (count == 5 && strncmp(features, "idivt", 5) == 0) |
| flags |= HWCAP_IDIVT; |
| else if (count == 6 && strncmp(features, "vfpd32", 6) == 0) |
| flags |= HWCAP_VFPD32; |
| else if (count == 5 && strncmp(features, "armv7", 5) == 0) |
| flags |= HWCAP_ARMv7; |
| else if (count == 5 && strncmp(features, "align", 5) == 0) |
| flags |= HWCAP_ALIGNMENT_FAULT; |
| #if defined(JS_SIMULATOR_ARM) |
| else if (count == 6 && strncmp(features, "hardfp", 6) == 0) |
| flags |= HWCAP_USE_HARDFP_ABI; |
| #endif |
| else if (override) |
| fprintf(stderr, "Warning: unexpected ARM feature at: %s\n", features); |
| features = end; |
| } |
| return flags; |
| } |
| |
| static uint32_t |
| CanonicalizeARMHwCapFlags(uint32_t flags) |
| { |
| // Canonicalize the flags. These rules are also applied to the features |
| // supplied for simulation. |
| |
| // The VFPv3 feature is expected when the VFPv3D16 is reported, but add it |
| // just in case of a kernel difference in feature reporting. |
| if (flags & HWCAP_VFPv3D16) |
| flags |= HWCAP_VFPv3; |
| |
| // If VFPv3 or Neon is supported then this must be an ARMv7. |
| if (flags & (HWCAP_VFPv3 | HWCAP_NEON)) |
| flags |= HWCAP_ARMv7; |
| |
| // Some old kernels report VFP and not VFPv3, but if ARMv7 then it must be |
| // VFPv3. |
| if (flags & HWCAP_VFP && flags & HWCAP_ARMv7) |
| flags |= HWCAP_VFPv3; |
| |
| // Older kernels do not implement the HWCAP_VFPD32 flag. |
| if ((flags & HWCAP_VFPv3) && !(flags & HWCAP_VFPv3D16)) |
| flags |= HWCAP_VFPD32; |
| |
| return flags; |
| } |
| |
| // The override flags parsed from the ARMHWCAP environment variable or from the |
| // --arm-hwcap js shell argument. |
| volatile uint32_t armHwCapFlags = HWCAP_UNINITIALIZED; |
| |
| bool |
| ParseARMHwCapFlags(const char* armHwCap) |
| { |
| uint32_t flags = 0; |
| |
| if (!armHwCap) |
| return false; |
| |
| if (strstr(armHwCap, "help")) { |
| fflush(NULL); |
| printf( |
| "\n" |
| "usage: ARMHWCAP=option,option,option,... where options can be:\n" |
| "\n" |
| " vfp \n" |
| " neon \n" |
| " vfpv3 \n" |
| " vfpv3d16 \n" |
| " vfpv4 \n" |
| " idiva \n" |
| " idivt \n" |
| " vfpd32 \n" |
| " armv7 \n" |
| " align \n" |
| #ifdef JS_SIMULATOR_ARM |
| " hardfp \n" |
| #endif |
| "\n" |
| ); |
| exit(0); |
| /*NOTREACHED*/ |
| } |
| |
| flags = ParseARMCpuFeatures(armHwCap, /* override = */ true); |
| |
| #ifdef JS_CODEGEN_ARM_HARDFP |
| flags |= HWCAP_USE_HARDFP_ABI; |
| #endif |
| |
| armHwCapFlags = CanonicalizeARMHwCapFlags(flags); |
| JitSpew(JitSpew_Codegen, "ARM HWCAP: 0x%x\n", armHwCapFlags); |
| return true; |
| } |
| |
| void |
| InitARMFlags() |
| { |
| uint32_t flags = 0; |
| |
| if (armHwCapFlags != HWCAP_UNINITIALIZED) |
| return; |
| |
| const char* env = js_sb_getenv("ARMHWCAP"); |
| if (ParseARMHwCapFlags(env)) |
| return; |
| |
| #ifdef JS_SIMULATOR_ARM |
| flags = HWCAP_ARMv7 | HWCAP_VFP | HWCAP_VFPv3 | HWCAP_VFPv4 | HWCAP_NEON; |
| #else |
| |
| #if defined(__linux__) |
| // This includes Android and B2G. |
| bool readAuxv = false; |
| int fd = open("/proc/self/auxv", O_RDONLY); |
| if (fd > 0) { |
| struct { uint32_t a_type; uint32_t a_val; } aux; |
| while (read(fd, &aux, sizeof(aux))) { |
| if (aux.a_type == AT_HWCAP) { |
| flags = aux.a_val; |
| readAuxv = true; |
| break; |
| } |
| } |
| close(fd); |
| } |
| |
| if (!readAuxv) { |
| // Read the cpuinfo Features if the auxv is not available. |
| FILE* fp = fopen("/proc/cpuinfo", "r"); |
| if (fp) { |
| char buf[1024]; |
| memset(buf, 0, sizeof(buf)); |
| size_t len = fread(buf, sizeof(char), sizeof(buf) - 1, fp); |
| fclose(fp); |
| buf[len] = '\0'; |
| char* featureList = strstr(buf, "Features"); |
| if (featureList) { |
| if (char* featuresEnd = strstr(featureList, "\n")) |
| *featuresEnd = '\0'; |
| flags = ParseARMCpuFeatures(featureList + 8); |
| } |
| if (strstr(buf, "ARMv7")) |
| flags |= HWCAP_ARMv7; |
| } |
| } |
| #endif |
| |
| // If compiled to use specialized features then these features can be |
| // assumed to be present otherwise the compiler would fail to run. |
| |
| #ifdef JS_CODEGEN_ARM_HARDFP |
| // Compiled to use the hardfp ABI. |
| flags |= HWCAP_USE_HARDFP_ABI; |
| #endif |
| |
| #if defined(__VFP_FP__) && !defined(__SOFTFP__) |
| // Compiled to use VFP instructions so assume VFP support. |
| flags |= HWCAP_VFP; |
| #endif |
| |
| #if defined(__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__) |
| // Compiled to use ARMv7 instructions so assume the ARMv7 arch. |
| flags |= HWCAP_ARMv7; |
| #endif |
| |
| #if defined(__APPLE__) |
| #if defined(__ARM_NEON__) |
| flags |= HWCAP_NEON; |
| #endif |
| #if defined(__ARMVFPV3__) |
| flags |= HWCAP_VFPv3 | HWCAP_VFPD32 |
| #endif |
| #endif |
| |
| #endif // JS_SIMULATOR_ARM |
| |
| armHwCapFlags = CanonicalizeARMHwCapFlags(flags); |
| |
| JitSpew(JitSpew_Codegen, "ARM HWCAP: 0x%x\n", armHwCapFlags); |
| return; |
| } |
| |
| uint32_t |
| GetARMFlags() |
| { |
| MOZ_ASSERT(armHwCapFlags != HWCAP_UNINITIALIZED); |
| return armHwCapFlags; |
| } |
| |
| bool HasMOVWT() |
| { |
| MOZ_ASSERT(armHwCapFlags != HWCAP_UNINITIALIZED); |
| return armHwCapFlags & HWCAP_ARMv7; |
| } |
| |
| bool HasLDSTREXBHD() |
| { |
| // These are really available from ARMv6K and later, but why bother? |
| MOZ_ASSERT(armHwCapFlags != HWCAP_UNINITIALIZED); |
| return armHwCapFlags & HWCAP_ARMv7; |
| } |
| |
| bool HasDMBDSBISB() |
| { |
| MOZ_ASSERT(armHwCapFlags != HWCAP_UNINITIALIZED); |
| return armHwCapFlags & HWCAP_ARMv7; |
| } |
| |
| bool HasVFPv3() |
| { |
| MOZ_ASSERT(armHwCapFlags != HWCAP_UNINITIALIZED); |
| return armHwCapFlags & HWCAP_VFPv3; |
| } |
| |
| bool HasVFP() |
| { |
| MOZ_ASSERT(armHwCapFlags != HWCAP_UNINITIALIZED); |
| return armHwCapFlags & HWCAP_VFP; |
| } |
| |
| bool Has32DP() |
| { |
| MOZ_ASSERT(armHwCapFlags != HWCAP_UNINITIALIZED); |
| return armHwCapFlags & HWCAP_VFPD32; |
| } |
| |
| bool HasIDIV() |
| { |
| MOZ_ASSERT(armHwCapFlags != HWCAP_UNINITIALIZED); |
| return armHwCapFlags & HWCAP_IDIVA; |
| } |
| |
| // This is defined in the header and inlined when not using the simulator. |
| #ifdef JS_SIMULATOR_ARM |
| bool UseHardFpABI() |
| { |
| MOZ_ASSERT(armHwCapFlags != HWCAP_UNINITIALIZED); |
| return armHwCapFlags & HWCAP_USE_HARDFP_ABI; |
| } |
| #endif |
| |
| Registers::Code |
| Registers::FromName(const char* name) |
| { |
| // Check for some register aliases first. |
| if (strcmp(name, "ip") == 0) |
| return ip; |
| if (strcmp(name, "r13") == 0) |
| return r13; |
| if (strcmp(name, "lr") == 0) |
| return lr; |
| if (strcmp(name, "r15") == 0) |
| return r15; |
| |
| for (size_t i = 0; i < Total; i++) { |
| if (strcmp(GetName(i), name) == 0) |
| return Code(i); |
| } |
| |
| return Invalid; |
| } |
| |
| FloatRegisters::Code |
| FloatRegisters::FromName(const char* name) |
| { |
| for (size_t i = 0; i < Total; i++) { |
| if (strcmp(GetName(i), name) == 0) |
| return Code(i); |
| } |
| |
| return Invalid; |
| } |
| |
| FloatRegisterSet |
| VFPRegister::ReduceSetForPush(const FloatRegisterSet& s) |
| { |
| LiveFloatRegisterSet mod; |
| for (FloatRegisterIterator iter(s); iter.more(); iter++) { |
| if ((*iter).isSingle()) { |
| // Add in just this float. |
| mod.addUnchecked(*iter); |
| } else if ((*iter).id() < 16) { |
| // A double with an overlay, add in both floats. |
| mod.addUnchecked((*iter).singleOverlay(0)); |
| mod.addUnchecked((*iter).singleOverlay(1)); |
| } else { |
| // Add in the lone double in the range 16-31. |
| mod.addUnchecked(*iter); |
| } |
| } |
| return mod.set(); |
| } |
| |
| uint32_t |
| VFPRegister::GetPushSizeInBytes(const FloatRegisterSet& s) |
| { |
| FloatRegisterSet ss = s.reduceSetForPush(); |
| uint64_t bits = ss.bits(); |
| uint32_t ret = mozilla::CountPopulation32(bits&0xffffffff) * sizeof(float); |
| ret += mozilla::CountPopulation32(bits >> 32) * sizeof(double); |
| return ret; |
| } |
| uint32_t |
| VFPRegister::getRegisterDumpOffsetInBytes() |
| { |
| if (isSingle()) |
| return id() * sizeof(float); |
| if (isDouble()) |
| return id() * sizeof(double); |
| MOZ_CRASH("not Single or Double"); |
| } |
| |
| uint32_t |
| FloatRegisters::ActualTotalPhys() |
| { |
| if (Has32DP()) |
| return 32; |
| return 16; |
| } |
| |
| |
| } // namespace jit |
| } // namespace js |
| |
