Cannot change name of function in SASM
0
I want to have a function _say_hi() in SASM, but it won't link in my C program:
SECTION .DATA
hello: db 'Hello world!',10
helloLen: equ $-hello
SECTION .TEXT
GLOBAL _say_hi
_say_hi:
mov eax,4 ; write()
mov ebx,1 ; STDOUT
mov ecx,hello
mov edx,helloLen
int 80h ; Interrupt
ret ; Return control
These are my questions
1) Can I run the assembly code if I change the function name? Because when I hit Run, it says:
[00:10:21] Build started...
[00:10:21] Warning! Errors have occurred in the build:
/usr/lib/gcc/x86_64-linux-gnu/7/../../../../lib32/Scrt1.o: In function `_start':
(.text+0x28): undefined reference to `main'
collect2: error: ld returned 1 exit status
Then when I try to link it with my C program:
#include <stdio.h>
int main(int argc, char *argv) {
extern say_hi();
say_hi();
}
I get:
jorgee@jorgee-Aspire-5830TG:~/Desktop/Orga2$ gcc src/main.c asm/test.o -o main
src/main.c: In function ‘main’:
src/main.c:4:9: warning: type defaults to ‘int’ in declaration of ‘say_hi’ [-Wimplicit-int]
extern say_hi();
^~~~~~
/usr/bin/ld: asm/test.o: relocation R_X86_64_32 against `.DATA' can not be used when making a PIE object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
c gcc assembly sasm
asked Nov 26 '18 at 3:12
JorgeeFGJorgeeFG
2,55773562
|
show 3 more comments
0
I want to have a function _say_hi() in SASM, but it won't link in my C program:
SECTION .DATA
hello: db 'Hello world!',10
helloLen: equ $-hello
SECTION .TEXT
GLOBAL _say_hi
_say_hi:
mov eax,4 ; write()
mov ebx,1 ; STDOUT
mov ecx,hello
mov edx,helloLen
int 80h ; Interrupt
ret ; Return control
These are my questions
1) Can I run the assembly code if I change the function name? Because when I hit Run, it says:
[00:10:21] Build started...
[00:10:21] Warning! Errors have occurred in the build:
/usr/lib/gcc/x86_64-linux-gnu/7/../../../../lib32/Scrt1.o: In function `_start':
(.text+0x28): undefined reference to `main'
collect2: error: ld returned 1 exit status
Then when I try to link it with my C program:
#include <stdio.h>
int main(int argc, char *argv) {
extern say_hi();
say_hi();
}
I get:
jorgee@jorgee-Aspire-5830TG:~/Desktop/Orga2$ gcc src/main.c asm/test.o -o main
src/main.c: In function ‘main’:
src/main.c:4:9: warning: type defaults to ‘int’ in declaration of ‘say_hi’ [-Wimplicit-int]
extern say_hi();
^~~~~~
/usr/bin/ld: asm/test.o: relocation R_X86_64_32 against `.DATA' can not be used when making a PIE object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
c gcc assembly sasm
asked Nov 26 '18 at 3:12
JorgeeFGJorgeeFG
2,55773562
extern void say_hi(void);. How do you assemble?
– Antti Haapala
Nov 26 '18 at 3:22
SASM is not an assembler. NASM is.
– Antti Haapala
Nov 26 '18 at 3:23
1
Also you're building 64-bit exe; can't really useint 0x80- stackoverflow.com/questions/46087730/…
– Antti Haapala
Nov 26 '18 at 3:25
You're doing a bunch of stuff wrong- build a 32-bit non-PIE executable (instead of 64-bit PIE, which is causing the relocation problems), and don't prefix symbol names with_. Linux/ELF uses C symbol names directly in asm. And you're declaringsay_hiinsidemain, which is weird.
– Peter Cordes
Nov 26 '18 at 3:30
@PeterCordes I was just following a tutorial. I wish to use SIMD instructions, so I guess I should set SASM to work with 64 bits? Could you help me?
– JorgeeFG
Nov 26 '18 at 3:31
|
show 3 more comments
0
0
0
I want to have a function _say_hi() in SASM, but it won't link in my C program:
SECTION .DATA
hello: db 'Hello world!',10
helloLen: equ $-hello
SECTION .TEXT
GLOBAL _say_hi
_say_hi:
mov eax,4 ; write()
mov ebx,1 ; STDOUT
mov ecx,hello
mov edx,helloLen
int 80h ; Interrupt
ret ; Return control
These are my questions
1) Can I run the assembly code if I change the function name? Because when I hit Run, it says:
[00:10:21] Build started...
[00:10:21] Warning! Errors have occurred in the build:
/usr/lib/gcc/x86_64-linux-gnu/7/../../../../lib32/Scrt1.o: In function `_start':
(.text+0x28): undefined reference to `main'
collect2: error: ld returned 1 exit status
Then when I try to link it with my C program:
#include <stdio.h>
int main(int argc, char *argv) {
extern say_hi();
say_hi();
}
I get:
jorgee@jorgee-Aspire-5830TG:~/Desktop/Orga2$ gcc src/main.c asm/test.o -o main
src/main.c: In function ‘main’:
src/main.c:4:9: warning: type defaults to ‘int’ in declaration of ‘say_hi’ [-Wimplicit-int]
extern say_hi();
^~~~~~
/usr/bin/ld: asm/test.o: relocation R_X86_64_32 against `.DATA' can not be used when making a PIE object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
c gcc assembly sasm
asked Nov 26 '18 at 3:12
JorgeeFGJorgeeFG
2,55773562
I want to have a function _say_hi() in SASM, but it won't link in my C program:
SECTION .DATA
hello: db 'Hello world!',10
helloLen: equ $-hello
SECTION .TEXT
GLOBAL _say_hi
_say_hi:
mov eax,4 ; write()
mov ebx,1 ; STDOUT
mov ecx,hello
mov edx,helloLen
int 80h ; Interrupt
ret ; Return control
These are my questions
1) Can I run the assembly code if I change the function name? Because when I hit Run, it says:
[00:10:21] Build started...
[00:10:21] Warning! Errors have occurred in the build:
/usr/lib/gcc/x86_64-linux-gnu/7/../../../../lib32/Scrt1.o: In function `_start':
(.text+0x28): undefined reference to `main'
collect2: error: ld returned 1 exit status
Then when I try to link it with my C program:
#include <stdio.h>
int main(int argc, char *argv) {
extern say_hi();
say_hi();
}
I get:
jorgee@jorgee-Aspire-5830TG:~/Desktop/Orga2$ gcc src/main.c asm/test.o -o main
src/main.c: In function ‘main’:
src/main.c:4:9: warning: type defaults to ‘int’ in declaration of ‘say_hi’ [-Wimplicit-int]
extern say_hi();
^~~~~~
/usr/bin/ld: asm/test.o: relocation R_X86_64_32 against `.DATA' can not be used when making a PIE object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
c gcc assembly sasm
c gcc assembly sasm
asked Nov 26 '18 at 3:12
JorgeeFGJorgeeFG
2,55773562
asked Nov 26 '18 at 3:12
JorgeeFGJorgeeFG
2,55773562
asked Nov 26 '18 at 3:12
JorgeeFGJorgeeFG
2,55773562
asked Nov 26 '18 at 3:12
JorgeeFGJorgeeFG
2,55773562
asked Nov 26 '18 at 3:12
JorgeeFGJorgeeFG
2,55773562
2,55773562
extern void say_hi(void);. How do you assemble?
– Antti Haapala
Nov 26 '18 at 3:22
SASM is not an assembler. NASM is.
– Antti Haapala
Nov 26 '18 at 3:23
1
Also you're building 64-bit exe; can't really useint 0x80- stackoverflow.com/questions/46087730/…
– Antti Haapala
Nov 26 '18 at 3:25
You're doing a bunch of stuff wrong- build a 32-bit non-PIE executable (instead of 64-bit PIE, which is causing the relocation problems), and don't prefix symbol names with_. Linux/ELF uses C symbol names directly in asm. And you're declaringsay_hiinsidemain, which is weird.
– Peter Cordes
Nov 26 '18 at 3:30
@PeterCordes I was just following a tutorial. I wish to use SIMD instructions, so I guess I should set SASM to work with 64 bits? Could you help me?
– JorgeeFG
Nov 26 '18 at 3:31
|
show 3 more comments
extern void say_hi(void);. How do you assemble?
– Antti Haapala
Nov 26 '18 at 3:22
SASM is not an assembler. NASM is.
– Antti Haapala
Nov 26 '18 at 3:23
1
Also you're building 64-bit exe; can't really useint 0x80- stackoverflow.com/questions/46087730/…
– Antti Haapala
Nov 26 '18 at 3:25
You're doing a bunch of stuff wrong- build a 32-bit non-PIE executable (instead of 64-bit PIE, which is causing the relocation problems), and don't prefix symbol names with_. Linux/ELF uses C symbol names directly in asm. And you're declaringsay_hiinsidemain, which is weird.
– Peter Cordes
Nov 26 '18 at 3:30
@PeterCordes I was just following a tutorial. I wish to use SIMD instructions, so I guess I should set SASM to work with 64 bits? Could you help me?
– JorgeeFG
Nov 26 '18 at 3:31
extern void say_hi(void);. How do you assemble?– Antti Haapala
Nov 26 '18 at 3:22
extern void say_hi(void);. How do you assemble?– Antti Haapala
Nov 26 '18 at 3:22
SASM is not an assembler. NASM is.
– Antti Haapala
Nov 26 '18 at 3:23
SASM is not an assembler. NASM is.
– Antti Haapala
Nov 26 '18 at 3:23
1
1
Also you're building 64-bit exe; can't really use
int 0x80 - stackoverflow.com/questions/46087730/…– Antti Haapala
Nov 26 '18 at 3:25
Also you're building 64-bit exe; can't really use
int 0x80 - stackoverflow.com/questions/46087730/…– Antti Haapala
Nov 26 '18 at 3:25
You're doing a bunch of stuff wrong- build a 32-bit non-PIE executable (instead of 64-bit PIE, which is causing the relocation problems), and don't prefix symbol names with
_. Linux/ELF uses C symbol names directly in asm. And you're declaring say_hi inside main, which is weird.– Peter Cordes
Nov 26 '18 at 3:30
You're doing a bunch of stuff wrong- build a 32-bit non-PIE executable (instead of 64-bit PIE, which is causing the relocation problems), and don't prefix symbol names with
_. Linux/ELF uses C symbol names directly in asm. And you're declaring say_hi inside main, which is weird.– Peter Cordes
Nov 26 '18 at 3:30
@PeterCordes I was just following a tutorial. I wish to use SIMD instructions, so I guess I should set SASM to work with 64 bits? Could you help me?
– JorgeeFG
Nov 26 '18 at 3:31
@PeterCordes I was just following a tutorial. I wish to use SIMD instructions, so I guess I should set SASM to work with 64 bits? Could you help me?
– JorgeeFG
Nov 26 '18 at 3:31
|
show 3 more comments
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extern void say_hi(void);. How do you assemble?– Antti Haapala
Nov 26 '18 at 3:22
SASM is not an assembler. NASM is.
– Antti Haapala
Nov 26 '18 at 3:23
1
Also you're building 64-bit exe; can't really use
int 0x80- stackoverflow.com/questions/46087730/…– Antti Haapala
Nov 26 '18 at 3:25
You're doing a bunch of stuff wrong- build a 32-bit non-PIE executable (instead of 64-bit PIE, which is causing the relocation problems), and don't prefix symbol names with
_. Linux/ELF uses C symbol names directly in asm. And you're declaringsay_hiinsidemain, which is weird.– Peter Cordes
Nov 26 '18 at 3:30
@PeterCordes I was just following a tutorial. I wish to use SIMD instructions, so I guess I should set SASM to work with 64 bits? Could you help me?
– JorgeeFG
Nov 26 '18 at 3:31