Next: , Previous: Nios II Syntax, Up: NiosII-Dependent


9.30.3 Nios II Machine Relocations

%hiadj(expression)
Extract the upper 16 bits of expression and add one if the 15th bit is set.

The value of %hiadj(expression) is:

          ((expression >> 16) & 0xffff) + ((expression >> 15) & 0x01)
     

The %hiadj relocation is intended to be used with the addi, ld or st instructions along with a %lo, in order to load a 32-bit constant.

          movhi r2, %hiadj(symbol)
          addi r2, r2, %lo(symbol)
     


%hi(expression)
Extract the upper 16 bits of expression.


%lo(expression)
Extract the lower 16 bits of expression.


%gprel(expression)
Subtract the value of the symbol _gp from expression.

The intention of the %gprel relocation is to have a fast small area of memory which only takes a 16-bit immediate to access.

          	.section .sdata
          fastint:
          	.int 123
          	.section .text
          	ldw r4, %gprel(fastint)(gp)
     


%call(expression)
%got(expression)
%gotoff(expression)
%gotoff_lo(expression)
%gotoff_hiadj(expression)
%tls_gd(expression)
%tls_ie(expression)
%tls_le(expression)
%tls_ldm(expression)
%tls_ldo(expression)
These relocations support the ABI for Linux Systems documented in the Nios II Processor Reference Handbook.