Study RISC-V ISA Exam Questions & Answers 2024/2025
0 view 0 purchase
Course
RISC-V ISA
Institution
RISC-V ISA
Study RISC-V ISA Exam Questions & Answers 2024/2025
How many registers are defined for an RV32I/RV64I processor? - ANSWERSx1-31 (general purpose)
+ PC (program counter)
+ x0 (hardwired zero)
===============
32 registers 32/64b wide
What four memory access instructions are supported in R...
Study RISC-V ISA Exam Questions &
Answers 2024/2025
How many registers are defined for an RV32I/RV64I processor? - ANSWERSx1-31 (general purpose)
+ PC (program counter)
+ x0 (hardwired zero)
===============
32 registers 32/64b wide
What four memory access instructions are supported in RV64I by the I-format, and how do operations of
this format interpret immediate values? - ANSWERSlb: load (8b) byte.
lh: load (16b) half word.
lw: load word (32b).
ld: load double (64b).
Operation instructions sign-extend immediates.
Ld from stack. - ANSWERSld rd, imm(sp) # load 64b from stack
Why does loading from a large offset or immediate value require multiple instructions? - ANSWERSAn
immediate is of size 12b when using loads so the effective address should be loaded into a register first if
the offset is greater than 12b which can help store the whole address (32b or 64b).
What are registers x0-4 and how are they defined? - ANSWERSx0: zero (hardwired zero)
x1: ra (return address)
x2: sp (stack pointer)
x3: gp (global pointer)
x4: tp (thread pointer)
, Prior to using a 32b immediate, use ___ (which loads the upper 20b of the destination register) for
immediate values greater than 12b. - ANSWERSlui dst, imm
What temporary registers (tN) are defined? - ANSWERSt0-6 (x5-7, x28-31)
What argument/return registers (aN) are defined? - ANSWERSa0-7
arguments: a0-7 (x10-17)
return values: a0, a1 (x10, x11)
What saved registers (sN) are defined? - ANSWERSs0-11 (x8-9, x18-27)
register x8 has what two other names? - ANSWERSs0: saved register
fp: frame pointer
Load 0xCAFEBABE into t0 in RV32I. - ANSWERSlui t0, 0xCAFEB
lw t0, 0xABE(t0)
Which registers are saved by the caller? - ANSWERSreturn address (ra)
function arguments (aN)
temporary registers (tN)
Which registers are saved by the callee? - ANSWERSstack pointer (sp)
frame pointer (fp)
saved registers (sN)
What is the difference between lui and auipc? - ANSWERSlui supports global addressing (uses the
effective address directly, rd=imm) while auipc supports relative addressing (adds upper immediate and
program counter to rd, rd=imm+PC).
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Bensuda. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.99. You're not tied to anything after your purchase.
