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Print register names

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Wesley Moore 2025-02-09 15:45:37 +10:00
parent 4c4d7bdbf7
commit 32b37bb374
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1 changed files with 29 additions and 8 deletions

37
calc.s
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@ -11,9 +11,12 @@
.section .rodata .section .rodata
str: .ascii "Hello World!\n" str: .ascii "Hello World!\n"
.set str_size, .-str .set str_size, .-str
str2: .ascii "regdump\n" str2: .ascii "regdump\n"
.set str2_size, .-str2 .set str2_size, .-str2
regnames:
.ascii "x0", "ra", "sp", "gp", "tp", "t0", "t1", "t2", "s0", "s1", "a0", "a1", "a2", "a3", "a4", "a5"
.section .bss .section .bss
buf: .skip 20 # room for 20 byte string buf: .skip 20 # room for 20 byte string
@ -92,19 +95,37 @@ regdump:
li a2, str2_size # length of other string li a2, str2_size # length of other string
ecall # invoke syscall to print the string ecall # invoke syscall to print the string
# as a test load something into buf and print it li t1, 0
la a1, buf # load address of buf into a1 li t2, 16
li a0, 'h
sb a0, 0(a1)
li a0, '\n
sb a0, 1(a1)
li a2, 2 # length of buf
regdump_loop:
beq t1, t2, regdump_done
# a1 = regnames + (2 * t1)
# a1 = t1 << 1 + regnames
la a1, regnames # load address of regnames
slli a2, t1, 1
add a1, a1, a2
# print the register name
li t0, SYSWRITE # "write" syscall li t0, SYSWRITE # "write" syscall
li a0, 1 # 1 = standard output (stdout) li a0, 1 # 1 = standard output (stdout)
# li a2, buflen # length of hello string # a1 is the address of the string, calculated above
li a2, 2 # length of register name string
ecall # invoke syscall to print the string ecall # invoke syscall to print the string
# add newline
la a1, buf # load address of buf into a1
li a0, '\n
sb a0, 0(a1)
li a2, 1 # length of buf
li t0, SYSWRITE # "write" syscall
li a0, 1 # 1 = standard output (stdout)
ecall # invoke syscall to print the string
addi t1, t1, 1
j regdump_loop
regdump_done:
addi sp, sp, 16 # deallocate stack space addi sp, sp, 16 # deallocate stack space
ret ret