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asm_debug.S
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/** some simple macros that can be used to debug asm code in
* QEMU
*
*/
.macro debug_letter_overwrites_x0_x1 , char
movz x0, #0x900, lsl #16
mov x1, #\char
str x1, [x0]
.endm
.global asmprintchar
asmprintchar:
adrp x9, asmprintchar_table
add x9, x9, :lo12:asmprintchar_table
mov x10, #16
mul x0, x10, x0
add x9, x9, x0
br x9
asmprintchar_table:
debug_letter_overwrites_x0_x1 48 // 0
ret
debug_letter_overwrites_x0_x1 49 // 1
ret
debug_letter_overwrites_x0_x1 50 // 2
ret
debug_letter_overwrites_x0_x1 51 // 3
ret
debug_letter_overwrites_x0_x1 52 // 4
ret
debug_letter_overwrites_x0_x1 53 // 5
ret
debug_letter_overwrites_x0_x1 54 // 6
ret
debug_letter_overwrites_x0_x1 55 // 7
ret
debug_letter_overwrites_x0_x1 56 // 8
ret
debug_letter_overwrites_x0_x1 57 // 9
ret
debug_letter_overwrites_x0_x1 65 // A
ret
debug_letter_overwrites_x0_x1 66 // B
ret
debug_letter_overwrites_x0_x1 67 // C
ret
debug_letter_overwrites_x0_x1 68 // D
ret
debug_letter_overwrites_x0_x1 69 // E
ret
debug_letter_overwrites_x0_x1 70 // F
ret
asmphex_step:
mov x29, x30
mov x0, x2
lsr x0, x0, #60
// x0 is 4 msb of x2
lsl x2, x2, #4
bl asmprintchar
mov x30,x29
ret
asmputhex:
mov x28, x30
mov x2, x0
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
bl asmphex_step
mov x30, x28
ret