9.47.2.3 Symbolic Operand Modifiers

The assembler supports several modifiers when using symbol addresses in TILEPro instruction operands. The general syntax is the following:

     modifier(symbol)

The following modifiers are supported:

lo16

This modifier is used to load the low 16 bits of the symbol's address, sign-extended to a 32-bit value (sign-extension allows it to be range-checked against signed 16 bit immediate operands without complaint).

hi16

This modifier is used to load the high 16 bits of the symbol's address, also sign-extended to a 32-bit value.

ha16

ha16(N) is identical to hi16(N), except if lo16(N) is negative it adds one to the hi16(N) value. This way lo16 and ha16 can be added to create any 32-bit value using auli. For example, here is how you move an arbitrary 32-bit address into r3:

          moveli r3, lo16(sym)
          auli r3, r3, ha16(sym)

got

This modifier is used to load the offset of the GOT entry corresponding to the symbol.

got_lo16

This modifier is used to load the sign-extended low 16 bits of the offset of the GOT entry corresponding to the symbol.

got_hi16

This modifier is used to load the sign-extended high 16 bits of the offset of the GOT entry corresponding to the symbol.

got_ha16

This modifier is like got_hi16, but it adds one if got_lo16 of the input value is negative.

plt

This modifier is used for function symbols. It causes a procedure linkage table, an array of code stubs, to be created at the time the shared object is created or linked against, together with a global offset table entry. The value is a pc-relative offset to the corresponding stub code in the procedure linkage table. This arrangement causes the run-time symbol resolver to be called to look up and set the value of the symbol the first time the function is called (at latest; depending environment variables). It is only safe to leave the symbol unresolved this way if all references are function calls.

tls_gd

This modifier is used to load the offset of the GOT entry of the symbol's TLS descriptor, to be used for general-dynamic TLS accesses.

tls_gd_lo16

This modifier is used to load the sign-extended low 16 bits of the offset of the GOT entry of the symbol's TLS descriptor, to be used for general dynamic TLS accesses.

tls_gd_hi16

This modifier is used to load the sign-extended high 16 bits of the offset of the GOT entry of the symbol's TLS descriptor, to be used for general dynamic TLS accesses.

tls_gd_ha16

This modifier is like tls_gd_hi16, but it adds one to the value if tls_gd_lo16 of the input value is negative.

tls_ie

This modifier is used to load the offset of the GOT entry containing the offset of the symbol's address from the TCB, to be used for initial-exec TLS accesses.

tls_ie_lo16

This modifier is used to load the low 16 bits of the offset of the GOT entry containing the offset of the symbol's address from the TCB, to be used for initial-exec TLS accesses.

tls_ie_hi16

This modifier is used to load the high 16 bits of the offset of the GOT entry containing the offset of the symbol's address from the TCB, to be used for initial-exec TLS accesses.

tls_ie_ha16

This modifier is like tls_ie_hi16, but it adds one to the value if tls_ie_lo16 of the input value is negative.

tls_le

This modifier is used to load the offset of the symbol's address from the TCB, to be used for local-exec TLS accesses.

tls_le_lo16

This modifier is used to load the low 16 bits of the offset of the symbol's address from the TCB, to be used for local-exec TLS accesses.

tls_le_hi16

This modifier is used to load the high 16 bits of the offset of the symbol's address from the TCB, to be used for local-exec TLS accesses.

tls_le_ha16

This modifier is like tls_le_hi16, but it adds one to the value if tls_le_lo16 of the input value is negative.

tls_gd_call

This modifier is used to tag an instruction as the “call” part of a calling sequence for a TLS GD reference of its operand.

tls_gd_add

This modifier is used to tag an instruction as the “add” part of a calling sequence for a TLS GD reference of its operand.

tls_ie_load

This modifier is used to tag an instruction as the “load” part of a calling sequence for a TLS IE reference of its operand.