How can I pass a Defined quad number (8 BYTES) as a parameters to a subprogram in 32 bit NASM assembly
I am using 32-bit NASM assembly and was wondering if there is a way to pass a defined quad number (8bytes) as a parameter to a subprogram in Nasm 32-bit assembly. I know that the stack in 32bit assembly is organized to accept defined double words (4 bytes). So I am wondering if this is even possible to do.
Example code:
section .data
x: dq 10 ;Defining x as a 8 byte number
section .bss
section .text
global asm_main
asm_main:
enter 0,0 ;Creating stack frame
push QWORD[x] ;pushing x as a parameter for the test subprogram
call test ;Calling the subprogram
add esp,8 ;Deallocating memory used by parameter
leave
ret
But when I run the code I get an error saying that (push QWORD[x]):
instruction not supported in 32-bit mode
assembly stack parameter-passing nasm 32bit-64bit
edited Nov 23 '18 at 21:58
zx485
14.5k133047
asked Nov 23 '18 at 21:53
JohnJohn
132
add a comment |
I am using 32-bit NASM assembly and was wondering if there is a way to pass a defined quad number (8bytes) as a parameter to a subprogram in Nasm 32-bit assembly. I know that the stack in 32bit assembly is organized to accept defined double words (4 bytes). So I am wondering if this is even possible to do.
Example code:
section .data
x: dq 10 ;Defining x as a 8 byte number
section .bss
section .text
global asm_main
asm_main:
enter 0,0 ;Creating stack frame
push QWORD[x] ;pushing x as a parameter for the test subprogram
call test ;Calling the subprogram
add esp,8 ;Deallocating memory used by parameter
leave
ret
But when I run the code I get an error saying that (push QWORD[x]):
instruction not supported in 32-bit mode
assembly stack parameter-passing nasm 32bit-64bit
edited Nov 23 '18 at 21:58
zx485
14.5k133047
asked Nov 23 '18 at 21:53
JohnJohn
132
2
push each dword separately, or copy it via an XMM register withmovqload/store.
– Peter Cordes
Nov 23 '18 at 21:55
Can you elaborate on how to push each dword separately
– John
Nov 23 '18 at 21:59
@John A QWORD can be seen as two DWORDs. So first push the high DWORD and then the low one.
– fuz
Nov 23 '18 at 22:02
add a comment |
I am using 32-bit NASM assembly and was wondering if there is a way to pass a defined quad number (8bytes) as a parameter to a subprogram in Nasm 32-bit assembly. I know that the stack in 32bit assembly is organized to accept defined double words (4 bytes). So I am wondering if this is even possible to do.
Example code:
section .data
x: dq 10 ;Defining x as a 8 byte number
section .bss
section .text
global asm_main
asm_main:
enter 0,0 ;Creating stack frame
push QWORD[x] ;pushing x as a parameter for the test subprogram
call test ;Calling the subprogram
add esp,8 ;Deallocating memory used by parameter
leave
ret
But when I run the code I get an error saying that (push QWORD[x]):
instruction not supported in 32-bit mode
assembly stack parameter-passing nasm 32bit-64bit
edited Nov 23 '18 at 21:58
zx485
14.5k133047
asked Nov 23 '18 at 21:53
JohnJohn
132
I am using 32-bit NASM assembly and was wondering if there is a way to pass a defined quad number (8bytes) as a parameter to a subprogram in Nasm 32-bit assembly. I know that the stack in 32bit assembly is organized to accept defined double words (4 bytes). So I am wondering if this is even possible to do.
Example code:
section .data
x: dq 10 ;Defining x as a 8 byte number
section .bss
section .text
global asm_main
asm_main:
enter 0,0 ;Creating stack frame
push QWORD[x] ;pushing x as a parameter for the test subprogram
call test ;Calling the subprogram
add esp,8 ;Deallocating memory used by parameter
leave
ret
But when I run the code I get an error saying that (push QWORD[x]):
instruction not supported in 32-bit mode
assembly stack parameter-passing nasm 32bit-64bit
assembly stack parameter-passing nasm 32bit-64bit
edited Nov 23 '18 at 21:58
zx485
14.5k133047
asked Nov 23 '18 at 21:53
JohnJohn
132
edited Nov 23 '18 at 21:58
zx485
14.5k133047
asked Nov 23 '18 at 21:53
JohnJohn
132
edited Nov 23 '18 at 21:58
zx485
14.5k133047
edited Nov 23 '18 at 21:58
zx485
14.5k133047
edited Nov 23 '18 at 21:58
zx485
14.5k133047
14.5k133047
asked Nov 23 '18 at 21:53
JohnJohn
132
asked Nov 23 '18 at 21:53
JohnJohn
132
asked Nov 23 '18 at 21:53
JohnJohn
132
132
2
push each dword separately, or copy it via an XMM register withmovqload/store.
– Peter Cordes
Nov 23 '18 at 21:55
Can you elaborate on how to push each dword separately
– John
Nov 23 '18 at 21:59
@John A QWORD can be seen as two DWORDs. So first push the high DWORD and then the low one.
– fuz
Nov 23 '18 at 22:02
add a comment |
2
push each dword separately, or copy it via an XMM register withmovqload/store.
– Peter Cordes
Nov 23 '18 at 21:55
Can you elaborate on how to push each dword separately
– John
Nov 23 '18 at 21:59
@John A QWORD can be seen as two DWORDs. So first push the high DWORD and then the low one.
– fuz
Nov 23 '18 at 22:02
2
2
push each dword separately, or copy it via an XMM register with
movq load/store.– Peter Cordes
Nov 23 '18 at 21:55
push each dword separately, or copy it via an XMM register with
movq load/store.– Peter Cordes
Nov 23 '18 at 21:55
Can you elaborate on how to push each dword separately
– John
Nov 23 '18 at 21:59
Can you elaborate on how to push each dword separately
– John
Nov 23 '18 at 21:59
@John A QWORD can be seen as two DWORDs. So first push the high DWORD and then the low one.
– fuz
Nov 23 '18 at 22:02
@John A QWORD can be seen as two DWORDs. So first push the high DWORD and then the low one.
– fuz
Nov 23 '18 at 22:02
add a comment |
1 Answer
1
active
oldest
votes
One way is to push each dword separately
push dword [x+4] ; high half first
push dword [x] ; then low half
Or you can do a 64-bit copy via an XMM register with movq load/store. x87 fild / fistp is probably not worth using, but movq is if SSE2 is available.
BTW, avoid the enter instruction. It's very slow. Use push ebp / mov ebp,esp like compilers do. (And for the record, you could have answered your own question by looking at compiler output for a function that calls another function, like void foo(int64_t *p) { bar(*p); }. https://godbolt.org/z/0rUx-M
answered Nov 23 '18 at 22:03
Peter CordesPeter Cordes
127k18190326
add a comment |
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1 Answer
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oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
One way is to push each dword separately
push dword [x+4] ; high half first
push dword [x] ; then low half
Or you can do a 64-bit copy via an XMM register with movq load/store. x87 fild / fistp is probably not worth using, but movq is if SSE2 is available.
BTW, avoid the enter instruction. It's very slow. Use push ebp / mov ebp,esp like compilers do. (And for the record, you could have answered your own question by looking at compiler output for a function that calls another function, like void foo(int64_t *p) { bar(*p); }. https://godbolt.org/z/0rUx-M
answered Nov 23 '18 at 22:03
Peter CordesPeter Cordes
127k18190326
add a comment |
One way is to push each dword separately
push dword [x+4] ; high half first
push dword [x] ; then low half
Or you can do a 64-bit copy via an XMM register with movq load/store. x87 fild / fistp is probably not worth using, but movq is if SSE2 is available.
BTW, avoid the enter instruction. It's very slow. Use push ebp / mov ebp,esp like compilers do. (And for the record, you could have answered your own question by looking at compiler output for a function that calls another function, like void foo(int64_t *p) { bar(*p); }. https://godbolt.org/z/0rUx-M
answered Nov 23 '18 at 22:03
Peter CordesPeter Cordes
127k18190326
add a comment |
One way is to push each dword separately
push dword [x+4] ; high half first
push dword [x] ; then low half
Or you can do a 64-bit copy via an XMM register with movq load/store. x87 fild / fistp is probably not worth using, but movq is if SSE2 is available.
BTW, avoid the enter instruction. It's very slow. Use push ebp / mov ebp,esp like compilers do. (And for the record, you could have answered your own question by looking at compiler output for a function that calls another function, like void foo(int64_t *p) { bar(*p); }. https://godbolt.org/z/0rUx-M
answered Nov 23 '18 at 22:03
Peter CordesPeter Cordes
127k18190326
One way is to push each dword separately
push dword [x+4] ; high half first
push dword [x] ; then low half
Or you can do a 64-bit copy via an XMM register with movq load/store. x87 fild / fistp is probably not worth using, but movq is if SSE2 is available.
BTW, avoid the enter instruction. It's very slow. Use push ebp / mov ebp,esp like compilers do. (And for the record, you could have answered your own question by looking at compiler output for a function that calls another function, like void foo(int64_t *p) { bar(*p); }. https://godbolt.org/z/0rUx-M
answered Nov 23 '18 at 22:03
Peter CordesPeter Cordes
127k18190326
answered Nov 23 '18 at 22:03
Peter CordesPeter Cordes
127k18190326
answered Nov 23 '18 at 22:03
Peter CordesPeter Cordes
127k18190326
answered Nov 23 '18 at 22:03
Peter CordesPeter Cordes
127k18190326
127k18190326
add a comment |
add a comment |
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2
push each dword separately, or copy it via an XMM register with
movqload/store.– Peter Cordes
Nov 23 '18 at 21:55
Can you elaborate on how to push each dword separately
– John
Nov 23 '18 at 21:59
@John A QWORD can be seen as two DWORDs. So first push the high DWORD and then the low one.
– fuz
Nov 23 '18 at 22:02