Accessing an element of array, which (array) is an element of structure in assembly (MASM)
recently I've started a course on x86 assembly (MASM) and have a question.
I have an array of structs that consist of 2 arrays each
Tabl1 struc
namex db 4 dup (?)
field1 dw 4 dup (?)
Tabl1 ENDS
Data1 segment
I_struc db ?
I_namex db ?
A1 Tabl1 6 dup (<>)
Data1 ends
I need to initialize each element of field1 array of each struct with some kind of value.
How can i access that element using adresses? So far I have
Code1 segment
ASSUME cs:Code1, ds:Data1
begin:
mov bx, 4
mov cx, 6
loop_1:
imul I_struc, cx, size Tabl1
loop_2:
imul I_namex, bx, size dw
mov byte ptr A1[I_struc-size Tabl1].field1[I_namex - size dw], somevalue ;line 25
loop loop_2
loop loop_1
mov ax, 4C00H
int 21H
Code1 ends
end begin
But MASM compiler says that dw symbol is not defined, although it's a standard type.
Edit 1: If I'm using 2 insted of size dw (which basically is the size of dw type in bytes) I get this error.
Edit 2: using "sizeof dw" insted of "size dw" I get this error
What I'm doing wrong and what's the solution for that?
arrays assembly struct x86 masm
asked Nov 24 '18 at 19:56
YRSHKHNYRSHKHN
164
add a comment |
recently I've started a course on x86 assembly (MASM) and have a question.
I have an array of structs that consist of 2 arrays each
Tabl1 struc
namex db 4 dup (?)
field1 dw 4 dup (?)
Tabl1 ENDS
Data1 segment
I_struc db ?
I_namex db ?
A1 Tabl1 6 dup (<>)
Data1 ends
I need to initialize each element of field1 array of each struct with some kind of value.
How can i access that element using adresses? So far I have
Code1 segment
ASSUME cs:Code1, ds:Data1
begin:
mov bx, 4
mov cx, 6
loop_1:
imul I_struc, cx, size Tabl1
loop_2:
imul I_namex, bx, size dw
mov byte ptr A1[I_struc-size Tabl1].field1[I_namex - size dw], somevalue ;line 25
loop loop_2
loop loop_1
mov ax, 4C00H
int 21H
Code1 ends
end begin
But MASM compiler says that dw symbol is not defined, although it's a standard type.
Edit 1: If I'm using 2 insted of size dw (which basically is the size of dw type in bytes) I get this error.
Edit 2: using "sizeof dw" insted of "size dw" I get this error
What I'm doing wrong and what's the solution for that?
arrays assembly struct x86 masm
asked Nov 24 '18 at 19:56
YRSHKHNYRSHKHN
164
1
Try usingsizeofinstead ofsize. The syntax ofsizeofisSIZEOF variable | type. This SO answer may give you some insight.
– zx485
Nov 24 '18 at 20:07
@zx485 but there is no variable that i want to find the size of, my goal is to use size of dw type.
– YRSHKHN
Nov 24 '18 at 20:09
I inferred that you wanted the size of a type, so my previous comment should still be valid.
– zx485
Nov 24 '18 at 20:11
@zx485 with sizeof I'm getting "symbol not defined: SIZEOF" error
– YRSHKHN
Nov 24 '18 at 20:14
add a comment |
recently I've started a course on x86 assembly (MASM) and have a question.
I have an array of structs that consist of 2 arrays each
Tabl1 struc
namex db 4 dup (?)
field1 dw 4 dup (?)
Tabl1 ENDS
Data1 segment
I_struc db ?
I_namex db ?
A1 Tabl1 6 dup (<>)
Data1 ends
I need to initialize each element of field1 array of each struct with some kind of value.
How can i access that element using adresses? So far I have
Code1 segment
ASSUME cs:Code1, ds:Data1
begin:
mov bx, 4
mov cx, 6
loop_1:
imul I_struc, cx, size Tabl1
loop_2:
imul I_namex, bx, size dw
mov byte ptr A1[I_struc-size Tabl1].field1[I_namex - size dw], somevalue ;line 25
loop loop_2
loop loop_1
mov ax, 4C00H
int 21H
Code1 ends
end begin
But MASM compiler says that dw symbol is not defined, although it's a standard type.
Edit 1: If I'm using 2 insted of size dw (which basically is the size of dw type in bytes) I get this error.
Edit 2: using "sizeof dw" insted of "size dw" I get this error
What I'm doing wrong and what's the solution for that?
arrays assembly struct x86 masm
asked Nov 24 '18 at 19:56
YRSHKHNYRSHKHN
164
recently I've started a course on x86 assembly (MASM) and have a question.
I have an array of structs that consist of 2 arrays each
Tabl1 struc
namex db 4 dup (?)
field1 dw 4 dup (?)
Tabl1 ENDS
Data1 segment
I_struc db ?
I_namex db ?
A1 Tabl1 6 dup (<>)
Data1 ends
I need to initialize each element of field1 array of each struct with some kind of value.
How can i access that element using adresses? So far I have
Code1 segment
ASSUME cs:Code1, ds:Data1
begin:
mov bx, 4
mov cx, 6
loop_1:
imul I_struc, cx, size Tabl1
loop_2:
imul I_namex, bx, size dw
mov byte ptr A1[I_struc-size Tabl1].field1[I_namex - size dw], somevalue ;line 25
loop loop_2
loop loop_1
mov ax, 4C00H
int 21H
Code1 ends
end begin
But MASM compiler says that dw symbol is not defined, although it's a standard type.
Edit 1: If I'm using 2 insted of size dw (which basically is the size of dw type in bytes) I get this error.
Edit 2: using "sizeof dw" insted of "size dw" I get this error
What I'm doing wrong and what's the solution for that?
arrays assembly struct x86 masm
arrays assembly struct x86 masm
asked Nov 24 '18 at 19:56
YRSHKHNYRSHKHN
164
asked Nov 24 '18 at 19:56
YRSHKHNYRSHKHN
164
edited Nov 24 '18 at 20:17
YRSHKHN
asked Nov 24 '18 at 19:56
YRSHKHNYRSHKHN
164
asked Nov 24 '18 at 19:56
YRSHKHNYRSHKHN
164
asked Nov 24 '18 at 19:56
YRSHKHNYRSHKHN
164
164
1
Try usingsizeofinstead ofsize. The syntax ofsizeofisSIZEOF variable | type. This SO answer may give you some insight.
– zx485
Nov 24 '18 at 20:07
@zx485 but there is no variable that i want to find the size of, my goal is to use size of dw type.
– YRSHKHN
Nov 24 '18 at 20:09
I inferred that you wanted the size of a type, so my previous comment should still be valid.
– zx485
Nov 24 '18 at 20:11
@zx485 with sizeof I'm getting "symbol not defined: SIZEOF" error
– YRSHKHN
Nov 24 '18 at 20:14
add a comment |
1
Try usingsizeofinstead ofsize. The syntax ofsizeofisSIZEOF variable | type. This SO answer may give you some insight.
– zx485
Nov 24 '18 at 20:07
@zx485 but there is no variable that i want to find the size of, my goal is to use size of dw type.
– YRSHKHN
Nov 24 '18 at 20:09
I inferred that you wanted the size of a type, so my previous comment should still be valid.
– zx485
Nov 24 '18 at 20:11
@zx485 with sizeof I'm getting "symbol not defined: SIZEOF" error
– YRSHKHN
Nov 24 '18 at 20:14
1
1
Try using
sizeof instead of size. The syntax of sizeof is SIZEOF variable | type. This SO answer may give you some insight.– zx485
Nov 24 '18 at 20:07
Try using
sizeof instead of size. The syntax of sizeof is SIZEOF variable | type. This SO answer may give you some insight.– zx485
Nov 24 '18 at 20:07
@zx485 but there is no variable that i want to find the size of, my goal is to use size of dw type.
– YRSHKHN
Nov 24 '18 at 20:09
@zx485 but there is no variable that i want to find the size of, my goal is to use size of dw type.
– YRSHKHN
Nov 24 '18 at 20:09
I inferred that you wanted the size of a type, so my previous comment should still be valid.
– zx485
Nov 24 '18 at 20:11
I inferred that you wanted the size of a type, so my previous comment should still be valid.
– zx485
Nov 24 '18 at 20:11
@zx485 with sizeof I'm getting "symbol not defined: SIZEOF" error
– YRSHKHN
Nov 24 '18 at 20:14
@zx485 with sizeof I'm getting "symbol not defined: SIZEOF" error
– YRSHKHN
Nov 24 '18 at 20:14
add a comment |
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1
Try using
sizeofinstead ofsize. The syntax ofsizeofisSIZEOF variable | type. This SO answer may give you some insight.– zx485
Nov 24 '18 at 20:07
@zx485 but there is no variable that i want to find the size of, my goal is to use size of dw type.
– YRSHKHN
Nov 24 '18 at 20:09
I inferred that you wanted the size of a type, so my previous comment should still be valid.
– zx485
Nov 24 '18 at 20:11
@zx485 with sizeof I'm getting "symbol not defined: SIZEOF" error
– YRSHKHN
Nov 24 '18 at 20:14