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printf: Add format specifier %p

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Kwarde
2025-07-15 16:39:19 +02:00
parent 70ab8b19c3
commit e718e1534b
2 changed files with 23 additions and 2 deletions
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9
src/console.asm
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@@ -69,6 +69,8 @@ puts:
; %X Unsigned integer, printed as hexadecimal number (uppercase)
; %b Unsigned integer, printed as binary number
; %o Unsigned integer, printed as octal number
; %p Print pointer, but truly alias for %#x -- this printf/udec processes all arguments as qwords so both %x and %p (and other specifiers) will always print full true value.
; That is also why %l/%ll is not supported - it's not needed.
; %s String
; %#{x} Use prefix for printed number (non-decimal). Supported specifiers: x, X, b, o. Works in combination with width specifier (see below)
; %[#]n* Pad left, n chars (maximum 64). Supported specifiers: d, i, u, x, X, b, o
@@ -281,6 +283,8 @@ printf:
je .rep_b
cmp byte [rdi + 1], 'o'
je .rep_o
cmp byte [rdi + 1], 'p'
je .rep_p
cmp byte [rdi + 1], 's'
je .rep_s
@@ -329,6 +333,11 @@ printf:
.rep_o:
process_arg 8, 0, utoa
;--- '%p' ---;
.rep_p:
mov r15, 1 ;always force prefix, no matter if %p or %#p was used. Do not override padding though
process_arg 16, 0, utoa
;--- '%s' ---;
.rep_s:
load_arg rsi

16
src/tests.asm
View File

@@ -99,9 +99,10 @@ section .rodata
printf12Str db "\nRAX\t%064b\nEAX\t\t\t\t\t%032b\n AX\t\t\t\t\t\t\t%016b\n AH\t\t\t\t\t\t\t%08b\t\n AL\t\t\t\t\t\t\t\t%08b\n",EOS
printf13 db TAB,"printf(",DQUO,"%o | %8o | %08o\n",DQUO,", 1500, 1500, 1500): ",NL,TAB,TAB,EOS
printf13Str db "%o | %8o | %08o\n",EOS
printf14 db TAB,"printf(",DQUO,"%#b | %#08b | %#x | %#8X\n | %#o",DQUO,", 8, 8, 0xABCDEF, 0x12345678, 15): ",NL,TAB,TAB,EOS
printf14 db TAB,"printf(",DQUO,"%#b | %#08b | %#x | %#8X | %#o\n",DQUO,", 8, 8, 0xABCDEF, 0x12345678, 15): ",NL,TAB,TAB,EOS
printf14Str db "%#b | %#08b | %#x | %#8X | %#o\n",EOS
printf15 db TAB,"printf(",DQUO,"%p | %#p | %8p | %08p | %#08p\n",DQUO,", 0xabc, 0xabc, 0xabc, 0xabc, 0xabc): ",NL,TAB,TAB,EOS
printf15Str db "%p | %#p | %8p | %08p | %#08p\n",EOS
; strlen()
msgStrlen db NL,"TEST strlen()",NL,EOS
strlen1 db TAB,"strlen(str1): %d",NL,EOS
@@ -396,6 +397,17 @@ _start:
mov r8, 0x12345678
mov r9, 15
call printf
; TEST 15
lea rdi, [rel printf15]
call print
lea rdi, [rel printf15Str]
mov rsi, 0xabc
mov rdx, 0xabc
mov rcx, 0xabc
mov r8, 0xabc
mov r9, 0xabc
call printf
%endif
;---