Star on github

jalr

Jump and link register

Saves the return address in the first register and jumps to the address in the second plus an offset, or with one register links through ra.

RISC-V manual: jalr

Forms

  • jalr , ,

Pseudo-instructions

The processor does not have these forms. The assembler replaces each of them with one or more real instructions. Open a row to see them.

Jump to address in t0 and set the return address to ra

  • Jump to address in t1 and set the return address to t0

Operands

t1
Any integer register, x0 to x31, or its named alias, such as zero, t0 or t6.
t2
An integer register. It may be the same register as t1.
imm12
A signed 12-bit immediate, -2048 to 2047.
t0
An integer register. It may be the same register as t1. 
# jalr saves the next instruction address (0x00400010) in ra. link_marker is that skipped instruction; t2 ends at 1.
.text
li t2, 0
la t3, done
jalr ra, 0(t3)
link_marker:
addi t2, t2, 100
done:
addi t2, t2, 1