maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[MIPS] Setup less-significant bit in a symbol value in microMIPS thunks 

The less-significant bit signals about microMIPS code for jump/branch instructions.

llvm-svn: 317778
This commit is contained in:
Simon Atanasyan 2017-11-09 10:42:22 +00:00
parent 60d74e4588
commit 3a7044ef78
2 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lld/ELF/Thunks.cpp
View File

@ -258,7 +258,7 @@ InputSection *MipsThunk::getTargetInputSection() const {
// Write microMIPS R2-R5 LA25 thunk code
// to call PIC function from the non-PIC one.
void MicroMipsThunk::writeTo(uint8_t *Buf, ThunkSection &) const {
uint64_t S = Destination.getVA();
uint64_t S = Destination.getVA() | 1;
write16(Buf, 0x41b9, Config->Endianness); // lui $25, %hi(func)
write16(Buf + 4, 0xd400, Config->Endianness); // j func
write16(Buf + 8, 0x3339, Config->Endianness); // addiu $25, $25, %lo(func)
@ -283,7 +283,7 @@ InputSection *MicroMipsThunk::getTargetInputSection() const {
// Write microMIPS R6 LA25 thunk code
// to call PIC function from the non-PIC one.
void MicroMipsR6Thunk::writeTo(uint8_t *Buf, ThunkSection &) const {
uint64_t S = Destination.getVA();
uint64_t S = Destination.getVA() | 1;
uint64_t P = ThunkSym->getVA();
write16(Buf, 0x1320, Config->Endianness); // lui $25, %hi(func)
write16(Buf + 4, 0x3339, Config->Endianness); // addiu $25, $25, %lo(func)

4
lld/test/ELF/mips-micro-thunks.s
View File

@ -27,7 +27,7 @@
# EB: __microLA25Thunk_foo:
# EB-NEXT: 20008: 41 b9 00 02 lui $25, 2
# EB-NEXT: 2000c: d4 01 00 10 j 131104
# EB-NEXT: 20010: 33 39 00 20 addiu $25, $25, 32
# EB-NEXT: 20010: 33 39 00 21 addiu $25, $25, 33
# EB-NEXT: 20014: 0c 00 nop
# EL: __start:
@ -37,7 +37,7 @@
# EL: __microLA25Thunk_foo:
# EL-NEXT: 20008: b9 41 02 00 lui $25, 2
# EL-NEXT: 2000c: 01 d4 10 00 j 131104
# EL-NEXT: 20010: 39 33 20 00 addiu $25, $25, 32
# EL-NEXT: 20010: 39 33 21 00 addiu $25, $25, 33
# EL-NEXT: 20014: 00 0c nop
.text