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[mips][mc] Emit R_{MICRO}MIPS_JALR when expanding jal to jalr 

When replacing jal with jalr, also emit '.reloc R_MIPS_JALR' (R_MICROMIPS_JALR
for micromips). The linker might then be able to turn jalr into a direct
call.
Add '-mips-jalr-reloc' to enable/disable this feature (default is true).

Differential revision: https://reviews.llvm.org/D55292

llvm-svn: 348760
This commit is contained in:
Vladimir Stefanovic 2018-12-10 15:07:36 +00:00
parent 753efe3584
commit 4433f93afe
2 changed files with 73 additions and 15 deletions
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24
llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
View File

@ -39,6 +39,7 @@
#include "llvm/MC/MCValue.h" #include "llvm/MC/MCValue.h"
#include "llvm/MC/SubtargetFeature.h" #include "llvm/MC/SubtargetFeature.h"
#include "llvm/Support/Casting.h" #include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h" #include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h" #include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h" #include "llvm/Support/ErrorHandling.h"
@ -64,6 +65,11 @@ class MCInstrInfo;
} // end namespace llvm } // end namespace llvm
static cl::opt<bool>
EmitJalrReloc("mips-jalr-reloc", cl::Hidden,
cl::desc("MIPS: Emit R_{MICRO}MIPS_JALR relocation with jalr"),
cl::init(true));
namespace { namespace {
class MipsAssemblerOptions { class MipsAssemblerOptions {
@ -2065,9 +2071,21 @@ bool MipsAsmParser::processInstruction(MCInst &Inst, SMLoc IDLoc,
JalrInst.addOperand(MCOperand::createReg(Mips::RA)); JalrInst.addOperand(MCOperand::createReg(Mips::RA));
JalrInst.addOperand(MCOperand::createReg(Mips::T9)); JalrInst.addOperand(MCOperand::createReg(Mips::T9));
// FIXME: Add an R_(MICRO)MIPS_JALR relocation after the JALR. if (EmitJalrReloc) {
// This relocation is supposed to be an optimization hint for the linker // As an optimization hint for the linker, before the JALR we add:
// and is not necessary for correctness. // .reloc tmplabel, R_{MICRO}MIPS_JALR, symbol
// tmplabel:
MCSymbol *TmpLabel = getContext().createTempSymbol();
const MCExpr *TmpExpr = MCSymbolRefExpr::create(TmpLabel, getContext());
const MCExpr *RelocJalrExpr =
MCSymbolRefExpr::create(JalSym, MCSymbolRefExpr::VK_None,
getContext(), IDLoc);
TOut.getStreamer().EmitRelocDirective(*TmpExpr,
inMicroMipsMode() ? "R_MICROMIPS_JALR" : "R_MIPS_JALR",
RelocJalrExpr, IDLoc, *STI);
TOut.getStreamer().EmitLabel(TmpLabel);
}
Inst = JalrInst; Inst = JalrInst;
ExpandedJalSym = true; ExpandedJalSym = true;

64
llvm/test/MC/Mips/expansion-jal-sym-pic.s
View File

@ -40,27 +40,38 @@ local_label:
# O32: # fixup A - offset: 0, value: %got(local_label), kind: fixup_Mips_GOT # O32: # fixup A - offset: 0, value: %got(local_label), kind: fixup_Mips_GOT
# O32: addiu $25, $25, %lo(local_label) # encoding: [0x27,0x39,A,A] # O32: addiu $25, $25, %lo(local_label) # encoding: [0x27,0x39,A,A]
# O32: # fixup A - offset: 0, value: %lo(local_label), kind: fixup_Mips_LO16 # O32: # fixup A - offset: 0, value: %lo(local_label), kind: fixup_Mips_LO16
# O32-NEXT: .reloc ($tmp0), R_MIPS_JALR, local_label
# ELF-O32: 8f 99 00 00 lw $25, 0($gp) # ELF-O32: 8f 99 00 00 lw $25, 0($gp)
# ELF-O32-NEXT: R_MIPS_GOT16 .text # ELF-O32-NEXT: R_MIPS_GOT16 .text
# ELF-O32-NEXT: 27 39 00 00 addiu $25, $25, 0 # ELF-O32-NEXT: 27 39 00 00 addiu $25, $25, 0
# ELF-O32-NEXT: R_MIPS_LO16 .text # ELF-O32-NEXT: R_MIPS_LO16 .text
# ELF-O32-NEXT: 03 20 f8 09 jalr $25
# ELF-O32-NEXT: R_MIPS_JALR local_label
# N32: lw $25, %got_disp(local_label)($gp) # encoding: [0x8f,0x99,A,A] # N32: lw $25, %got_disp(local_label)($gp) # encoding: [0x8f,0x99,A,A]
# N32: # fixup A - offset: 0, value: %got_disp(local_label), kind: fixup_Mips_GOT_DISP # N32: # fixup A - offset: 0, value: %got_disp(local_label), kind: fixup_Mips_GOT_DISP
# N32-NEXT: .reloc ($tmp0), R_MIPS_JALR, local_label
# ELF-N32: 8f 99 00 00 lw $25, 0($gp) # ELF-N32: 8f 99 00 00 lw $25, 0($gp)
# ELF-N32-NEXT: R_MIPS_GOT_DISP local_label # ELF-N32-NEXT: R_MIPS_GOT_DISP local_label
# ELF-N32-NEXT: 03 20 f8 09 jalr $25
# ELF-N32-NEXT: R_MIPS_JALR local_label
# N64: ld $25, %got_disp(local_label)($gp) # encoding: [0xdf,0x99,A,A] # N64: ld $25, %got_disp(local_label)($gp) # encoding: [0xdf,0x99,A,A]
# N64: # fixup A - offset: 0, value: %got_disp(local_label), kind: fixup_Mips_GOT_DISP # N64: # fixup A - offset: 0, value: %got_disp(local_label), kind: fixup_Mips_GOT_DISP
# N64-NEXT: .reloc .Ltmp0, R_MIPS_JALR, local_label
# ELF-N64: df 99 00 00 ld $25, 0($gp) # ELF-N64: df 99 00 00 ld $25, 0($gp)
# ELF-N64-NEXT: R_MIPS_GOT_DISP/R_MIPS_NONE/R_MIPS_NONE local_label # ELF-N64-NEXT: R_MIPS_GOT_DISP/R_MIPS_NONE/R_MIPS_NONE local_label
# ELF-N64-NEXT: 03 20 f8 09 jalr $25
# ELF-N64-NEXT: R_MIPS_JALR/R_MIPS_NONE/R_MIPS_NONE local_label
# O32-MM: lw $25, %got(local_label)($gp) # encoding: [0xff,0x3c,A,A] # O32-MM: lw $25, %got(local_label)($gp) # encoding: [0xff,0x3c,A,A]
# O32-MM: # fixup A - offset: 0, value: %got(local_label), kind: fixup_MICROMIPS_GOT16 # O32-MM: # fixup A - offset: 0, value: %got(local_label), kind: fixup_MICROMIPS_GOT16
# O32-MM: addiu $25, $25, %lo(local_label) # encoding: [0x33,0x39,A,A] # O32-MM: addiu $25, $25, %lo(local_label) # encoding: [0x33,0x39,A,A]
# O32-MM: # fixup A - offset: 0, value: %lo(local_label), kind: fixup_MICROMIPS_LO16 # O32-MM: # fixup A - offset: 0, value: %lo(local_label), kind: fixup_MICROMIPS_LO16
# O32-MM-NEXT: .reloc ($tmp0), R_MICROMIPS_JALR, local_label
# MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09] # MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09]
# MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c] # MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c]
@ -72,24 +83,34 @@ local_label:
# Expanding "jal weak_label": # Expanding "jal weak_label":
# O32: lw $25, %call16(weak_label)($gp) # encoding: [0x8f,0x99,A,A] # O32: lw $25, %call16(weak_label)($gp) # encoding: [0x8f,0x99,A,A]
# O32: # fixup A - offset: 0, value: %call16(weak_label), kind: fixup_Mips_CALL16 # O32: # fixup A - offset: 0, value: %call16(weak_label), kind: fixup_Mips_CALL16
# O32-NEXT: .reloc ($tmp1), R_MIPS_JALR, weak_label
# ELF-O32: 8f 99 00 00 lw $25, 0($gp) # ELF-O32: 8f 99 00 00 lw $25, 0($gp)
# ELF-O32-NEXT: R_MIPS_CALL16 weak_label # ELF-O32-NEXT: R_MIPS_CALL16 weak_label
# ELF-O32-NEXT: 03 20 f8 09 jalr $25
# ELF-O32-NEXT: R_MIPS_JALR weak_label
# N32: lw $25, %call16(weak_label)($gp) # encoding: [0x8f,0x99,A,A] # N32: lw $25, %call16(weak_label)($gp) # encoding: [0x8f,0x99,A,A]
# N32: # fixup A - offset: 0, value: %call16(weak_label), kind: fixup_Mips_CALL16 # N32: # fixup A - offset: 0, value: %call16(weak_label), kind: fixup_Mips_CALL16
# N32-NEXT: .reloc ($tmp1), R_MIPS_JALR, weak_label
# ELF-N32: 8f 99 00 00 lw $25, 0($gp) # ELF-N32: 8f 99 00 00 lw $25, 0($gp)
# ELF-N32-NEXT: R_MIPS_CALL16 weak_label # ELF-N32-NEXT: R_MIPS_CALL16 weak_label
# ELF-N32-NEXT: 03 20 f8 09 jalr $25
# ELF-N32-NEXT: R_MIPS_JALR weak_label
# N64: ld $25, %call16(weak_label)($gp) # encoding: [0xdf,0x99,A,A] # N64: ld $25, %call16(weak_label)($gp) # encoding: [0xdf,0x99,A,A]
# N64: # fixup A - offset: 0, value: %call16(weak_label), kind: fixup_Mips_CALL16 # N64: # fixup A - offset: 0, value: %call16(weak_label), kind: fixup_Mips_CALL16
# N64-NEXT: .reloc .Ltmp1, R_MIPS_JALR, weak_label
# ELF-N64: df 99 00 00 ld $25, 0($gp) # ELF-N64: df 99 00 00 ld $25, 0($gp)
# ELF-N64-NEXT: R_MIPS_CALL16/R_MIPS_NONE/R_MIPS_NONE weak_label # ELF-N64-NEXT: R_MIPS_CALL16/R_MIPS_NONE/R_MIPS_NONE weak_label
# ELF-N64-NEXT: 03 20 f8 09 jalr $25
# ELF-N64-NEXT: R_MIPS_JALR/R_MIPS_NONE/R_MIPS_NONE weak_label
# O32-MM: lw $25, %call16(weak_label)($gp) # encoding: [0xff,0x3c,A,A] # O32-MM: lw $25, %call16(weak_label)($gp) # encoding: [0xff,0x3c,A,A]
# O32-MM: # fixup A - offset: 0, value: %call16(weak_label), kind: fixup_MICROMIPS_CALL16 # O32-MM: # fixup A - offset: 0, value: %call16(weak_label), kind: fixup_MICROMIPS_CALL16
# O32-MM-NEXT: .reloc ($tmp1), R_MICROMIPS_JALR, weak_label
# MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09] # MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09]
# MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c] # MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c]
@ -101,24 +122,34 @@ local_label:
# Expanding "jal global_label": # Expanding "jal global_label":
# O32: lw $25, %call16(global_label)($gp) # encoding: [0x8f,0x99,A,A] # O32: lw $25, %call16(global_label)($gp) # encoding: [0x8f,0x99,A,A]
# O32: # fixup A - offset: 0, value: %call16(global_label), kind: fixup_Mips_CALL16 # O32: # fixup A - offset: 0, value: %call16(global_label), kind: fixup_Mips_CALL16
# O32-NEXT: .reloc ($tmp2), R_MIPS_JALR, global_label
# ELF-O32: 8f 99 00 00 lw $25, 0($gp) # ELF-O32: 8f 99 00 00 lw $25, 0($gp)
# ELF-O32-NEXT: R_MIPS_CALL16 global_label # ELF-O32-NEXT: R_MIPS_CALL16 global_label
# ELF-O32-NEXT: 03 20 f8 09 jalr $25
# ELF-O32-NEXT: R_MIPS_JALR global_label
# N32: lw $25, %call16(global_label)($gp) # encoding: [0x8f,0x99,A,A] # N32: lw $25, %call16(global_label)($gp) # encoding: [0x8f,0x99,A,A]
# N32: # fixup A - offset: 0, value: %call16(global_label), kind: fixup_Mips_CALL16 # N32: # fixup A - offset: 0, value: %call16(global_label), kind: fixup_Mips_CALL16
# N32-NEXT: .reloc ($tmp2), R_MIPS_JALR, global_label
# ELF-N32: 8f 99 00 00 lw $25, 0($gp) # ELF-N32: 8f 99 00 00 lw $25, 0($gp)
# ELF-N32-NEXT: R_MIPS_CALL16 global_label # ELF-N32-NEXT: R_MIPS_CALL16 global_label
# ELF-N32-NEXT: 03 20 f8 09 jalr $25
# ELF-N32-NEXT: R_MIPS_JALR global_label
# N64: ld $25, %call16(global_label)($gp) # encoding: [0xdf,0x99,A,A] # N64: ld $25, %call16(global_label)($gp) # encoding: [0xdf,0x99,A,A]
# N64: # fixup A - offset: 0, value: %call16(global_label), kind: fixup_Mips_CALL16 # N64: # fixup A - offset: 0, value: %call16(global_label), kind: fixup_Mips_CALL16
# N64-NEXT: .reloc .Ltmp2, R_MIPS_JALR, global_label
# ELF-N64: df 99 00 00 ld $25, 0($gp) # ELF-N64: df 99 00 00 ld $25, 0($gp)
# ELF-N64-NEXT: R_MIPS_CALL16/R_MIPS_NONE/R_MIPS_NONE global_label # ELF-N64-NEXT: R_MIPS_CALL16/R_MIPS_NONE/R_MIPS_NONE global_label
# ELF-N64-NEXT: 03 20 f8 09 jalr $25
# ELF-N64-NEXT: R_MIPS_JALR/R_MIPS_NONE/R_MIPS_NONE global_label
# O32-MM: lw $25, %call16(global_label)($gp) # encoding: [0xff,0x3c,A,A] # O32-MM: lw $25, %call16(global_label)($gp) # encoding: [0xff,0x3c,A,A]
# O32-MM: # fixup A - offset: 0, value: %call16(global_label), kind: fixup_MICROMIPS_CALL16 # O32-MM: # fixup A - offset: 0, value: %call16(global_label), kind: fixup_MICROMIPS_CALL16
# O32-MM-NEXT: .reloc ($tmp2), R_MICROMIPS_JALR, global_label
# MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09] # MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09]
# MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c] # MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c]
@ -150,6 +181,7 @@ local_label:
# O32-MM-NEXT: # fixup A - offset: 0, value: %got(.text), kind: fixup_MICROMIPS_GOT16 # O32-MM-NEXT: # fixup A - offset: 0, value: %got(.text), kind: fixup_MICROMIPS_GOT16
# O32-MM-NEXT: addiu $25, $25, %lo(.text) # encoding: [0x33,0x39,A,A] # O32-MM-NEXT: addiu $25, $25, %lo(.text) # encoding: [0x33,0x39,A,A]
# O32-MM-NEXT: # fixup A - offset: 0, value: %lo(.text), kind: fixup_MICROMIPS_LO16 # O32-MM-NEXT: # fixup A - offset: 0, value: %lo(.text), kind: fixup_MICROMIPS_LO16
# O32-MM-NEXT: .reloc ($tmp3), R_MICROMIPS_JALR, .text
# MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09] # MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09]
# MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c] # MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c]
@ -160,32 +192,36 @@ local_label:
nop nop
# Expanding "jal 1f": # Expanding "jal 1f":
# O32: lw $25, %got($tmp0)($gp) # encoding: [0x8f,0x99,A,A] # O32: lw $25, %got($tmp4)($gp) # encoding: [0x8f,0x99,A,A]
# O32: # fixup A - offset: 0, value: %got($tmp0), kind: fixup_Mips_GOT # O32: # fixup A - offset: 0, value: %got($tmp4), kind: fixup_Mips_GOT
# O32: addiu $25, $25, %lo($tmp0) # encoding: [0x27,0x39,A,A] # O32: addiu $25, $25, %lo($tmp4) # encoding: [0x27,0x39,A,A]
# O32: # fixup A - offset: 0, value: %lo($tmp0), kind: fixup_Mips_LO16 # O32: # fixup A - offset: 0, value: %lo($tmp4), kind: fixup_Mips_LO16
# O32-NEXT: .reloc ($tmp5), R_MIPS_JALR, ($tmp4)
# ELF-O32: 8f 99 00 00 lw $25, 0($gp) # ELF-O32: 8f 99 00 00 lw $25, 0($gp)
# ELF-O32-NEXT: R_MIPS_GOT16 .text # ELF-O32-NEXT: R_MIPS_GOT16 .text
# ELF-O32-NEXT: 27 39 00 58 addiu $25, $25, 88 # ELF-O32-NEXT: 27 39 00 58 addiu $25, $25, 88
# ELF-O32-NEXT: R_MIPS_LO16 .text # ELF-O32-NEXT: R_MIPS_LO16 .text
# ELF-O32-NEXT: 03 20 f8 09 jalr $25
# ELF-O32-NEXT: R_MIPS_JALR $tmp0
# N32: lw $25, %got_disp($tmp0)($gp) # encoding: [0x8f,0x99,A,A] # N32: lw $25, %got_disp($tmp4)($gp) # encoding: [0x8f,0x99,A,A]
# N32: # fixup A - offset: 0, value: %got_disp($tmp0), kind: fixup_Mips_GOT_DISP # N32: # fixup A - offset: 0, value: %got_disp($tmp4), kind: fixup_Mips_GOT_DISP
# ELF-N32: 8f 99 00 00 lw $25, 0($gp) # ELF-N32: 8f 99 00 00 lw $25, 0($gp)
# ELF-N32-NEXT: R_MIPS_GOT_DISP .Ltmp0 # ELF-N32-NEXT: R_MIPS_GOT_DISP .Ltmp0
# N64: ld $25, %got_disp(.Ltmp0)($gp) # encoding: [0xdf,0x99,A,A] # N64: ld $25, %got_disp(.Ltmp4)($gp) # encoding: [0xdf,0x99,A,A]
# N64: # fixup A - offset: 0, value: %got_disp(.Ltmp0), kind: fixup_Mips_GOT_DISP # N64: # fixup A - offset: 0, value: %got_disp(.Ltmp4), kind: fixup_Mips_GOT_DISP
# ELF-N64: df 99 00 00 ld $25, 0($gp) # ELF-N64: df 99 00 00 ld $25, 0($gp)
# ELF-N64-NEXT: R_MIPS_GOT_DISP/R_MIPS_NONE/R_MIPS_NONE .Ltmp0 # ELF-N64-NEXT: R_MIPS_GOT_DISP/R_MIPS_NONE/R_MIPS_NONE .Ltmp0
# O32-MM: lw $25, %got($tmp0)($gp) # encoding: [0xff,0x3c,A,A] # O32-MM: lw $25, %got($tmp4)($gp) # encoding: [0xff,0x3c,A,A]
# O32-MM: # fixup A - offset: 0, value: %got($tmp0), kind: fixup_MICROMIPS_GOT16 # O32-MM: # fixup A - offset: 0, value: %got($tmp4), kind: fixup_MICROMIPS_GOT16
# O32-MM: addiu $25, $25, %lo($tmp0) # encoding: [0x33,0x39,A,A] # O32-MM: addiu $25, $25, %lo($tmp4) # encoding: [0x33,0x39,A,A]
# O32-MM: # fixup A - offset: 0, value: %lo($tmp0), kind: fixup_MICROMIPS_LO16 # O32-MM: # fixup A - offset: 0, value: %lo($tmp4), kind: fixup_MICROMIPS_LO16
# O32-MM-NEXT: .reloc ($tmp5), R_MICROMIPS_JALR, ($tmp4)
# MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09] # MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09]
# MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c] # MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c]
@ -200,11 +236,14 @@ local_label:
# O32-FIXME: # fixup A - offset: 0, value: %got(forward_local), kind: fixup_Mips_GOT # O32-FIXME: # fixup A - offset: 0, value: %got(forward_local), kind: fixup_Mips_GOT
# O32-FIXME: addiu $25, $25, %lo(forward_local) # encoding: [0x27,0x39,A,A] # O32-FIXME: addiu $25, $25, %lo(forward_local) # encoding: [0x27,0x39,A,A]
# O32-FIXME:: # fixup A - offset: 0, value: %lo(forward_local), kind: fixup_Mips_LO16 # O32-FIXME:: # fixup A - offset: 0, value: %lo(forward_local), kind: fixup_Mips_LO16
# O32-FIXME: .reloc ($tmp6), R_MIPS_JALR, forward_local
# ELF-O32: 8f 99 00 00 lw $25, 0($gp) # ELF-O32: 8f 99 00 00 lw $25, 0($gp)
# ELF-O32-NEXT: R_MIPS_GOT16 .text # ELF-O32-NEXT: R_MIPS_GOT16 .text
# ELF-O32-NEXT: 27 39 00 64 addiu $25, $25, 100 # ELF-O32-NEXT: 27 39 00 64 addiu $25, $25, 100
# ELF-O32-NEXT: R_MIPS_LO16 .text # ELF-O32-NEXT: R_MIPS_LO16 .text
# ELF-O32-NEXT: 03 20 f8 09 jalr $25
# ELF-O32-NEXT: R_MIPS_JALR forward_local
# N32-FIXME: lw $25, %got_disp(forward_local)($gp) # encoding: [0x8f,0x99,A,A] # N32-FIXME: lw $25, %got_disp(forward_local)($gp) # encoding: [0x8f,0x99,A,A]
# N32-FIXME: # fixup A - offset: 0, value: %got_disp(forward_local), kind: fixup_Mips_GOT_DISP # N32-FIXME: # fixup A - offset: 0, value: %got_disp(forward_local), kind: fixup_Mips_GOT_DISP
@ -222,6 +261,7 @@ local_label:
# O32-MM-FIXME: # fixup A - offset: 0, value: %got(forward_local), kind: fixup_MICROMIPS_GOT16 # O32-MM-FIXME: # fixup A - offset: 0, value: %got(forward_local), kind: fixup_MICROMIPS_GOT16
# O32-MM-FIXME: addiu $25, $25, %lo(forward_local) # encoding: [0x33,0x39,A,A] # O32-MM-FIXME: addiu $25, $25, %lo(forward_local) # encoding: [0x33,0x39,A,A]
# O32-MM-FIXME: # fixup A - offset: 0, value: %lo(forward_local), kind: fixup_MICROMIPS_LO16 # O32-MM-FIXME: # fixup A - offset: 0, value: %lo(forward_local), kind: fixup_MICROMIPS_LO16
# O32-MM-FIXME: .reloc ($tmp6), R_MIPS_JALR, forward_local
# MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09] # MIPS: jalr $25 # encoding: [0x03,0x20,0xf8,0x09]
# MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c] # MM: jalr $ra, $25 # encoding: [0x03,0xf9,0x0f,0x3c]