9.39.2.3 Symbolic Operand Modifiers

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

     modifier(symbol)

The following modifiers are supported:

hw0

This modifier is used to load bits 0-15 of the symbol's address.

hw1

This modifier is used to load bits 16-31 of the symbol's address.

hw2

This modifier is used to load bits 32-47 of the symbol's address.

hw3

This modifier is used to load bits 48-63 of the symbol's address.

hw0_last

This modifier yields the same value as hw0, but it also checks that the value does not overflow.

hw1_last

This modifier yields the same value as hw1, but it also checks that the value does not overflow.

hw2_last

This modifier yields the same value as hw2, but it also checks that the value does not overflow.

A 48-bit symbolic value is constructed by using the following idiom:

          moveli r0, hw2_last(sym)
          shl16insli r0, r0, hw1(sym)
          shl16insli r0, r0, hw0(sym)
     

hw0_got

This modifier is used to load bits 0-15 of the symbol's offset in the GOT entry corresponding to the symbol.

hw1_got

This modifier is used to load bits 16-31 of the symbol's offset in the GOT entry corresponding to the symbol.

hw2_got

This modifier is used to load bits 32-47 of the symbol's offset in the GOT entry corresponding to the symbol.

hw3_got

This modifier is used to load bits 48-63 of the symbol's offset in the GOT entry corresponding to the symbol.

hw0_last_got

This modifier yields the same value as hw0_got, but it also checks that the value does not overflow.

hw1_last_got

This modifier yields the same value as hw1_got, but it also checks that the value does not overflow.

hw2_last_got

This modifier yields the same value as hw2_got, but it also checks that the value does not overflow.

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.

hw0_tls_gd

This modifier is used to load bits 0-15 of the offset of the GOT entry of the symbol's TLS descriptor, to be used for general-dynamic TLS accesses.

hw1_tls_gd

This modifier is used to load bits 16-31 of the offset of the GOT entry of the symbol's TLS descriptor, to be used for general-dynamic TLS accesses.

hw2_tls_gd

This modifier is used to load bits 32-47 of the offset of the GOT entry of the symbol's TLS descriptor, to be used for general-dynamic TLS accesses.

hw3_tls_gd

This modifier is used to load bits 48-63 of the offset of the GOT entry of the symbol's TLS descriptor, to be used for general-dynamic TLS accesses.

hw0_last_tls_gd

This modifier yields the same value as hw0_tls_gd, but it also checks that the value does not overflow.

hw1_last_tls_gd

This modifier yields the same value as hw1_tls_gd, but it also checks that the value does not overflow.

hw2_last_tls_gd

This modifier yields the same value as hw2_tls_gd, but it also checks that the value does not overflow.

hw0_tls_ie

This modifier is used to load bits 0-15 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.

hw1_tls_ie

This modifier is used to load bits 16-31 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.

hw2_tls_ie

This modifier is used to load bits 32-47 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.

hw3_tls_ie

This modifier is used to load bits 48-63 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.

hw0_last_tls_ie

This modifier yields the same value as hw0_tls_ie, but it also checks that the value does not overflow.

hw1_last_tls_ie

This modifier yields the same value as hw1_tls_ie, but it also checks that the value does not overflow.

hw2_last_tls_ie

This modifier yields the same value as hw2_tls_ie, but it also checks that the value does not overflow.