1 //===- AVR.cpp ------------------------------------------------------------===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // AVR is a Harvard-architecture 8-bit microcontroller designed for small
10 // baremetal programs. All AVR-family processors have 32 8-bit registers.
12 // one supports up to 2^24 data address space and 2^22 code address space.
17 // can write the linked code to on-chip flush memory. You can do that with
20 //   ld.lld -Ttext=0 -o foo foo.o
21 //   objcopy -O binary --only-section=.text foo output.bin
26 //===----------------------------------------------------------------------===//
49                      const uint8_t *loc) const override;
53   void relocate(uint8_t *loc, const Relocation &rel,
59                         const uint8_t *loc) const {  in getRelExpr()
96     error(getErrorLocation(loc) + "unknown relocation (" + Twine(type) +  in getRelExpr()
102 static void writeLDI(uint8_t *loc, uint64_t val) {  in writeLDI()  argument
103   write16le(loc, (read16le(loc) & 0xf0f0) | (val & 0xf0) << 4 | (val & 0x0f));  in writeLDI()
119 void AVR::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {  in relocate()  argument
122     checkUInt(loc, val, 8, rel);  in relocate()
123     *loc = val;  in relocate()
126     checkUInt(loc, val, 32, rel);  in relocate()
127     *loc = val & 0xff;  in relocate()
130     checkUInt(loc, val, 32, rel);  in relocate()
131     *loc = (val >> 8) & 0xff;  in relocate()
134     checkUInt(loc, val, 32, rel);  in relocate()
135     *loc = (val >> 16) & 0xff;  in relocate()
138     // Note: this relocation is often used between code and data space, which  in relocate()
141     write16le(loc, val & 0xffff);  in relocate()
144     checkAlignment(loc, val, 2, rel);  in relocate()
145     checkUInt(loc, val >> 1, 16, rel);  in relocate()
146     write16le(loc, val >> 1);  in relocate()
149     checkUInt(loc, val, 32, rel);  in relocate()
150     write32le(loc, val);  in relocate()
154     checkUInt(loc, val, 8, rel);  in relocate()
155     writeLDI(loc, val & 0xff);  in relocate()
159     writeLDI(loc, -val & 0xff);  in relocate()
162     writeLDI(loc, val & 0xff);  in relocate()
165     writeLDI(loc, (-val >> 8) & 0xff);  in relocate()
168     writeLDI(loc, (val >> 8) & 0xff);  in relocate()
171     writeLDI(loc, (-val >> 16) & 0xff);  in relocate()
174     writeLDI(loc, (val >> 16) & 0xff);  in relocate()
177     writeLDI(loc, (-val >> 24) & 0xff);  in relocate()
180     writeLDI(loc, (val >> 24) & 0xff);  in relocate()
184     checkUInt(loc, val, 17, rel);  in relocate()
187     checkAlignment(loc, val, 2, rel);  in relocate()
188     writeLDI(loc, (val >> 1) & 0xff);  in relocate()
191     checkUInt(loc, val, 17, rel);  in relocate()
194     checkAlignment(loc, val, 2, rel);  in relocate()
195     writeLDI(loc, (val >> 9) & 0xff);  in relocate()
198     checkAlignment(loc, val, 2, rel);  in relocate()
199     writeLDI(loc, (val >> 17) & 0xff);  in relocate()
203     checkAlignment(loc, val, 2, rel);  in relocate()
204     writeLDI(loc, (-val >> 1) & 0xff);  in relocate()
207     checkAlignment(loc, val, 2, rel);  in relocate()
208     writeLDI(loc, (-val >> 9) & 0xff);  in relocate()
211     checkAlignment(loc, val, 2, rel);  in relocate()
212     writeLDI(loc, (-val >> 17) & 0xff);  in relocate()
216     checkUInt(loc, val, 7, rel);  in relocate()
219     write16le(loc, (read16le(loc) & 0xf8f0) | ((hi << 8) | lo));  in relocate()
224     checkUInt(loc, val, 5, rel);  in relocate()
225     write16le(loc, (read16le(loc) & 0xff07) | (val << 3));  in relocate()
228     checkUInt(loc, val, 6, rel);  in relocate()
229     write16le(loc, (read16le(loc) & 0xf9f0) | (val & 0x30) << 5 | (val & 0x0f));  in relocate()
234     checkInt(loc, val - 2, 8, rel);  in relocate()
235     checkAlignment(loc, val, 2, rel);  in relocate()
236     const uint16_t target = (val - 2) >> 1;  in relocate()
237     write16le(loc, (read16le(loc) & 0xfc07) | ((target & 0x7f) << 3));  in relocate()
241     checkAlignment(loc, val, 2, rel);  in relocate()
242     const uint16_t target = (val - 2) >> 1;  in relocate()
243     write16le(loc, (read16le(loc) & 0xf000) | (target & 0xfff));  in relocate()
248     checkInt(loc, val, 6, rel);  in relocate()
249     write16le(loc, (read16le(loc) & 0xd3f8) | (val & 0x20) << 8 |  in relocate()
253     checkInt(loc, val, 6, rel);  in relocate()
254     write16le(loc, (read16le(loc) & 0xff30) | (val & 0x30) << 2 | (val & 0x0F));  in relocate()
258     checkAlignment(loc, val, 2, rel);  in relocate()
261     write16le(loc, read16le(loc) | ((hi >> 1) << 4) | (hi & 1));  in relocate()
262     write16le(loc + 2, lo);  in relocate()
276   return cast<ObjFile<ELF32LE>>(file)->getObj().getHeader().e_flags;  in getEFlags()