| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #if defined(WITH_JIT) |
| |
| /* |
| * ARMv5 definitions and declarations. |
| */ |
| |
| /* |
| ARM EABI general notes: |
| |
| r0-r3 hold first 4 args to a method; they are not preserved across method calls |
| r4-r8 are available for general use |
| r9 is given special treatment in some situations, but not for us |
| r10 (sl) seems to be generally available |
| r11 (fp) is used by gcc (unless -fomit-frame-pointer is set) |
| r12 (ip) is scratch -- not preserved across method calls |
| r13 (sp) should be managed carefully in case a signal arrives |
| r14 (lr) must be preserved |
| r15 (pc) can be tinkered with directly |
| |
| r0 holds returns of <= 4 bytes |
| r0-r1 hold returns of 8 bytes, low word in r0 |
| |
| Callee must save/restore r4+ (except r12) if it modifies them. |
| |
| Stack is "full descending". Only the arguments that don't fit in the first 4 |
| registers are placed on the stack. "sp" points at the first stacked argument |
| (i.e. the 5th arg). |
| |
| VFP: single-precision results in s0, double-precision results in d0. |
| |
| In the EABI, "sp" must be 64-bit aligned on entry to a function, and any |
| 64-bit quantities (long long, double) must be 64-bit aligned. |
| */ |
| |
| /* |
| JIT and ARM notes: |
| |
| The following registers have fixed assignments: |
| |
| reg nick purpose |
| r5 rFP interpreted frame pointer, used for accessing locals and args |
| r6 rSELF thread pointer |
| |
| The following registers have fixed assignments in mterp but are scratch |
| registers in compiled code |
| |
| reg nick purpose |
| r4 rPC interpreted program counter, used for fetching instructions |
| r7 rINST first 16-bit code unit of current instruction |
| r8 rIBASE interpreted instruction base pointer, used for computed goto |
| |
| Macros are provided for common operations. Each macro MUST emit only |
| one instruction to make instruction-counting easier. They MUST NOT alter |
| unspecified registers or condition codes. |
| */ |
| |
| /* single-purpose registers, given names for clarity */ |
| #define rPC r4 |
| #define rFP r5 |
| #define rSELF r6 |
| #define rINST r7 |
| #define rIBASE r8 |
| |
| /* |
| * Given a frame pointer, find the stack save area. |
| * |
| * In C this is "((StackSaveArea*)(_fp) -1)". |
| */ |
| #define SAVEAREA_FROM_FP(_reg, _fpreg) \ |
| sub _reg, _fpreg, #sizeofStackSaveArea |
| |
| #define EXPORT_PC() \ |
| str rPC, [rFP, #(-sizeofStackSaveArea + offStackSaveArea_currentPc)] |
| |
| /* |
| * This is a #include, not a %include, because we want the C pre-processor |
| * to expand the macros into assembler assignment statements. |
| */ |
| #include "../../../mterp/common/asm-constants.h" |
