9.48.2.3 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.