diff options
Diffstat (limited to 'vm/compiler/codegen/arm/Thumb2/Gen.c')
| -rw-r--r-- | vm/compiler/codegen/arm/Thumb2/Gen.c | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/vm/compiler/codegen/arm/Thumb2/Gen.c b/vm/compiler/codegen/arm/Thumb2/Gen.c index 0891524f7..f5e1096ea 100644 --- a/vm/compiler/codegen/arm/Thumb2/Gen.c +++ b/vm/compiler/codegen/arm/Thumb2/Gen.c @@ -15,13 +15,64 @@ */ /* - * This file contains codegen for the Thumb ISA and is intended to be + * This file contains codegen for the Thumb2 ISA and is intended to be * includes by: * * Codegen-$(TARGET_ARCH_VARIANT).c * */ +/* + * Reserve 6 bytes at the beginning of the trace + * +----------------------------+ + * | prof count addr (4 bytes) | + * +----------------------------+ + * | chain cell offset (2 bytes)| + * +----------------------------+ + * + * ...and then code to increment the execution + * + * For continuous profiling (10 bytes) + * ldr r0, [pc-8] @ get prof count addr [4 bytes] + * ldr r1, [r0] @ load counter [2 bytes] + * add r1, #1 @ increment [2 bytes] + * str r1, [r0] @ store [2 bytes] + * + * For periodic profiling (4 bytes) + * call TEMPLATE_PERIODIC_PROFILING + * + * and return the size (in bytes) of the generated code. + */ + +static int genTraceProfileEntry(CompilationUnit *cUnit) +{ + intptr_t addr = (intptr_t)dvmJitNextTraceCounter(); + assert(__BYTE_ORDER == __LITTLE_ENDIAN); + newLIR1(cUnit, kArm16BitData, addr & 0xffff); + newLIR1(cUnit, kArm16BitData, (addr >> 16) & 0xffff); + cUnit->chainCellOffsetLIR = + (LIR *) newLIR1(cUnit, kArm16BitData, CHAIN_CELL_OFFSET_TAG); + cUnit->headerSize = 6; + if ((gDvmJit.profileMode == kTraceProfilingContinuous) || + (gDvmJit.profileMode == kTraceProfilingDisabled)) { + /* Thumb[2] instruction used directly here to ensure correct size */ + newLIR2(cUnit, kThumb2LdrPcReln12, r0, 8); + newLIR3(cUnit, kThumbLdrRRI5, r1, r0, 0); + newLIR2(cUnit, kThumbAddRI8, r1, 1); + newLIR3(cUnit, kThumbStrRRI5, r1, r0, 0); + return 10; + } else { + int opcode = TEMPLATE_PERIODIC_PROFILING; + newLIR2(cUnit, kThumbBlx1, + (int) gDvmJit.codeCache + templateEntryOffsets[opcode], + (int) gDvmJit.codeCache + templateEntryOffsets[opcode]); + newLIR2(cUnit, kThumbBlx2, + (int) gDvmJit.codeCache + templateEntryOffsets[opcode], + (int) gDvmJit.codeCache + templateEntryOffsets[opcode]); + return 4; + } +} + static void genNegFloat(CompilationUnit *cUnit, RegLocation rlDest, RegLocation rlSrc) { |