diff --git a/compiler/src/main/pascal/blaise.assembler.x86_64.pas b/compiler/src/main/pascal/blaise.assembler.x86_64.pas
index 95f1225..33f0a03 100644
--- a/compiler/src/main/pascal/blaise.assembler.x86_64.pas
+++ b/compiler/src/main/pascal/blaise.assembler.x86_64.pas
@@ -163,6 +163,7 @@ type
     Sym:     string;       { symbol name (for RIP-rel, labels, TLS) }
     SymDisp: Int64;        { addend to symbol (sym + N) }
     TpOff:   Boolean;      { sym@tpoff — emit R_X86_64_TPOFF32 relocation }
+    Indirect: Boolean;     { memory operand reached via *mem (call/jmp *disp(%reg)) }
   end;
 
   { Parsed line types }
@@ -342,6 +343,7 @@ begin
   Result.Scale  := 1;
   Result.Sym    := '';
   Result.SymDisp := 0;
+  Result.Indirect := False;
 
   P := APos;
   while (P < Length(S)) and ((S[P]= Ord(' ')) or (S[P]= 9)) do
@@ -353,7 +355,8 @@ begin
     Exit;
   end;
 
-  { Indirect register: *%reg }
+  { Indirect operand: *%reg (register-indirect) or *disp(%reg) (memory-
+    indirect), used by `call`/`jmp` through a pointer. }
   if S[P]= Ord('*') then
   begin
     P := P + 1;
@@ -371,6 +374,11 @@ begin
       AEnd := P;
       Exit;
     end;
+    { *disp(%reg): parse the remainder as an ordinary memory operand and flag
+      it indirect so the branch encoder uses FF /4 with that memory ModRM. }
+    Result := ParseOperand(S, P, AEnd);
+    Result.Indirect := True;
+    Exit;
   end;
 
   { Immediate: $N }
@@ -1244,6 +1252,45 @@ begin
   Result := (AWidth = 8) and (ARegCode >= 4) and (ARegCode <= 7);
 end;
 
+{ Map an unsuffixed AT&T mnemonic (mov/lea/xor/…) to its size-suffixed form,
+  inferring the operand size from a register operand's width (GNU as does the
+  same).  Mnemonics that already carry a suffix, and ones that are size-fixed in
+  long mode (push/pop/call/jmp are 64-bit), pass through.  64-bit is the default
+  when no register operand pins the width. }
+function NormalizeMnemonic(const AMnem: string;
+  const AOp1, AOp2: TOperand): string;
+var
+  W: Integer;
+  Suffix: string;
+begin
+  Result := AMnem;
+  { Width from whichever operand is a register (Op2 first — it is the
+    destination in AT&T two-operand forms). }
+  W := 0;
+  if AOp2.Kind = opReg then W := AOp2.RegW
+  else if AOp1.Kind = opReg then W := AOp1.RegW;
+  if W = 64 then Suffix := 'q'
+  else if W = 32 then Suffix := 'l'
+  else if W = 16 then Suffix := 'w'
+  else if W = 8 then Suffix := 'b'
+  else Suffix := 'q';   { default 64-bit when no register pins the size }
+
+  { Size-inferred integer ALU/data mnemonics. }
+  if (AMnem = 'mov') or (AMnem = 'xor') or (AMnem = 'and') or (AMnem = 'or') or
+     (AMnem = 'add') or (AMnem = 'sub') or (AMnem = 'cmp') or (AMnem = 'test') or
+     (AMnem = 'inc') or (AMnem = 'dec') or (AMnem = 'neg') or (AMnem = 'not') or
+     (AMnem = 'imul') or (AMnem = 'shl') or (AMnem = 'shr') then
+    Result := AMnem + Suffix
+  { lea's size is the destination pointer width — always 64-bit here. }
+  else if AMnem = 'lea' then
+    Result := 'leaq'
+  { Stack/branch ops are 64-bit-only in long mode. }
+  else if AMnem = 'push' then Result := 'pushq'
+  else if AMnem = 'pop'  then Result := 'popq'
+  else if AMnem = 'call' then Result := 'callq';
+  { 'jmp' keeps its name (the encoder already handles jmp incl. indirect). }
+end;
+
 { ---- Main instruction encoder ----------------------------------------- }
 
 function EncodeInstruction(var ACtx: TEncodeContext;
@@ -1261,9 +1308,10 @@ var
 begin
   CBInit(CB);
   ACtx.ImmTail := 0;
-  Mnem := AParsed.Mnemonic;
   Op1 := AParsed.Op1;
   Op2 := AParsed.Op2;
+  { Accept unsuffixed AT&T mnemonics (mov/lea/xor/…) by inferring the size. }
+  Mnem := NormalizeMnemonic(AParsed.Mnemonic, Op1, Op2);
 
   { ---- lock prefix (F0) — emitted ahead of the instruction it guards ---- }
   if AParsed.HasLock then
@@ -1277,6 +1325,30 @@ begin
     Exit;
   end;
 
+  { ---- endbr64 (CET) ---- F3 0F 1E FA }
+  if Mnem = 'endbr64' then
+  begin
+    CBEmit(CB, $F3); CBEmit(CB, $0F); CBEmit(CB, $1E); CBEmit(CB, $FA);
+    Result := CB.Data;
+    Exit;
+  end;
+
+  { ---- hlt ---- F4 }
+  if Mnem = 'hlt' then
+  begin
+    CBEmit(CB, $F4);
+    Result := CB.Data;
+    Exit;
+  end;
+
+  { ---- syscall ---- 0F 05 }
+  if Mnem = 'syscall' then
+  begin
+    CBEmit(CB, $0F); CBEmit(CB, $05);
+    Result := CB.Data;
+    Exit;
+  end;
+
   { ---- leave ---- }
   if Mnem = 'leave' then
   begin
@@ -1433,10 +1505,25 @@ begin
     end
     else if (Op1.Kind = opIndirect) then
     begin
+      { Register-indirect: jmp *%reg / call *%reg.  FF /4 (jmp) or /2 (call). }
       if Op1.Reg >= 8 then
         CBEmit(CB, MakeRex(False, False, False, True));
       CBEmit(CB, $FF);
-      CBEmit(CB, MakeModRM(3, 4, Op1.Reg));
+      if Mnem = 'jmp' then
+        CBEmit(CB, MakeModRM(3, 4, Op1.Reg))
+      else
+        CBEmit(CB, MakeModRM(3, 2, Op1.Reg));
+    end
+    else if IsMemLike(Op1) and Op1.Indirect then
+    begin
+      { Memory-indirect: jmp *disp(%reg) / call *disp(%reg).  FF /4 or /2 with
+        the memory ModRM. }
+      EmitRexForMem(CB, False, 0, Op1, False);
+      CBEmit(CB, $FF);
+      if Mnem = 'jmp' then
+        EncodeMemOperand(CB, ACtx, Op1, 4)
+      else
+        EncodeMemOperand(CB, ACtx, Op1, 2);
     end
     else
       raise EAssembler.Create(Mnem + ': unsupported operand');
@@ -1546,22 +1633,24 @@ begin
   end;
 
   { ---- incq / decq ---- }
-  if (Mnem = 'incq') or (Mnem = 'decq') then
+  if (Mnem = 'incq') or (Mnem = 'decq') or
+     (Mnem = 'incl') or (Mnem = 'decl') then
   begin
+    { FF /0 = inc, /1 = dec; REX.W only for the 'q' (64-bit) forms. }
     if Op1.Kind = opReg then
     begin
-      EmitRexIfNeeded(CB, True, 0, Op1.Reg, False);
+      EmitRexIfNeeded(CB, (Mnem = 'incq') or (Mnem = 'decq'), 0, Op1.Reg, False);
       CBEmit(CB, $FF);
-      if Mnem = 'incq' then
+      if (Mnem = 'incq') or (Mnem = 'incl') then
         CBEmit(CB, MakeModRM(3, 0, Op1.Reg))
       else
         CBEmit(CB, MakeModRM(3, 1, Op1.Reg));
     end
     else if IsMemLike(Op1) then
     begin
-      EmitRexForMem(CB, True, 0, Op1, False);
+      EmitRexForMem(CB, (Mnem = 'incq') or (Mnem = 'decq'), 0, Op1, False);
       CBEmit(CB, $FF);
-      if Mnem = 'incq' then
+      if (Mnem = 'incq') or (Mnem = 'incl') then
         EncodeMemOperand(CB, ACtx, Op1, 0)
       else
         EncodeMemOperand(CB, ACtx, Op1, 1);
diff --git a/compiler/src/test/pascal/cp.test.assembler.pas b/compiler/src/test/pascal/cp.test.assembler.pas
index e4a3e05..3cdc95f 100644
--- a/compiler/src/test/pascal/cp.test.assembler.pas
+++ b/compiler/src/test/pascal/cp.test.assembler.pas
@@ -38,6 +38,10 @@ type
     procedure TestMovqRegToXmm_SseEncoding;
     procedure TestNegl_F7Slash3;
     procedure TestLockXaddl_AtomicEncoding;
+    procedure TestUnsuffixedMov_InfersSize;
+    procedure TestJmpIndirectMem_FFSlash4;
+    procedure TestEndbr64AndHlt;
+    procedure TestSyscall_0F05;
   end;
 
   { ---- ELF writer unit tests ---- }
@@ -172,6 +176,52 @@ begin
     ContainsBytes(Obj, Chr($F0) + Chr($0F) + Chr($C1) + Chr($07)));
 end;
 
+procedure TAsmEncodingTests.TestUnsuffixedMov_InfersSize;
+var
+  Obj: string;
+begin
+  { Unsuffixed AT&T mnemonics infer size from the register operand.
+    mov %rbx, (%rdi) is 64-bit -> 48 89 1f (same as movq).  Verified vs cc. }
+  Obj := AssembleToBytes('mov %rbx, (%rdi)' + LineEnding);
+  AssertTrue('48 89 1f missing (mov inferred q)',
+    ContainsBytes(Obj, Chr($48) + Chr($89) + Chr($1F)));
+  { xor %eax, %eax is 32-bit -> 31 c0 (no REX.W). }
+  Obj := AssembleToBytes('xor %eax, %eax' + LineEnding);
+  AssertTrue('31 c0 missing (xor inferred l)',
+    ContainsBytes(Obj, Chr($31) + Chr($C0)));
+end;
+
+procedure TAsmEncodingTests.TestJmpIndirectMem_FFSlash4;
+var
+  Obj: string;
+begin
+  { jmp *56(%rdi) -> ff 67 38  (FF /4, memory-indirect).  The longjmp tail. }
+  Obj := AssembleToBytes('jmp *56(%rdi)' + LineEnding);
+  AssertTrue('ff 67 38 missing',
+    ContainsBytes(Obj, Chr($FF) + Chr($67) + Chr($38)));
+end;
+
+procedure TAsmEncodingTests.TestEndbr64AndHlt;
+var
+  Obj: string;
+begin
+  { endbr64 -> f3 0f 1e fa ; hlt -> f4 }
+  Obj := AssembleToBytes('endbr64' + LineEnding);
+  AssertTrue('f3 0f 1e fa missing',
+    ContainsBytes(Obj, Chr($F3) + Chr($0F) + Chr($1E) + Chr($FA)));
+  Obj := AssembleToBytes('hlt' + LineEnding);
+  AssertTrue('f4 missing', ContainsBytes(Obj, Chr($F4)));
+end;
+
+procedure TAsmEncodingTests.TestSyscall_0F05;
+var
+  Obj: string;
+begin
+  { syscall -> 0f 05 (needed for the FreeBSD direct-syscall stubs). }
+  Obj := AssembleToBytes('syscall' + LineEnding);
+  AssertTrue('0f 05 missing', ContainsBytes(Obj, Chr($0F) + Chr($05)));
+end;
+
 procedure TAsmEncodingTests.TestQuadSymbol_EmitsReloc;
 var
   Obj: string;
diff --git a/compiler/src/test/pascal/cp.test.linker.pas b/compiler/src/test/pascal/cp.test.linker.pas
index 79d4ce2..35f5c81 100644
--- a/compiler/src/test/pascal/cp.test.linker.pas
+++ b/compiler/src/test/pascal/cp.test.linker.pas
@@ -335,7 +335,7 @@ var
   I: Integer;
   M: TArchiveMember;
   Obj: TElfObjectFile;
-  SawSetjmp: Boolean;
+  SawLongName: Boolean;
 begin
   RTLPath := ProjectRoot() + 'compiler/target/blaise_rtl.a';
   if not FileExists(RTLPath) then
@@ -348,12 +348,14 @@ begin
     ReadArchiveFile(RTLPath, Members);
     AssertTrue('expected several RTL members, got '
       + IntToStr(Members.Count), Members.Count >= 5);
-    SawSetjmp := False;
+    { A member whose name exceeds 15 chars exercises the GNU long-name (//)
+      table.  rtl_platform_layout_linux.o is the longest current RTL member. }
+    SawLongName := False;
     for I := 0 to Members.Count - 1 do
     begin
       M := Members.Get(I);
-      if M.Name = 'blaise_setjmp_x86_64.o' then
-        SawSetjmp := True;
+      if M.Name = 'rtl_platform_layout_linux.o' then
+        SawLongName := True;
       { Every member must parse as a valid x86-64 relocatable object
         with at least its NULL section + one real section. }
       Obj := ParseElfObject(M.Data, M.Name);
@@ -364,8 +366,8 @@ begin
         Obj.Free();
       end;
     end;
-    AssertTrue('long-named member blaise_setjmp_x86_64.o not found '
-      + '(GNU long-name table mishandled?)', SawSetjmp);
+    AssertTrue('long-named member rtl_platform_layout_linux.o not found '
+      + '(GNU long-name table mishandled?)', SawLongName);
   finally
     for I := 0 to Members.Count - 1 do
       Members.Get(I).Free();