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elftest64: both Small PIC and Medium PIC model tests

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Try both Small PIC and Medium PIC model references.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2008-10-17 22:10:33 -07:00
parent 70e6c2a6cb
commit 15ed768673
2 changed files with 35 additions and 10 deletions
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36
test/elf64so.asm
View File

@ -27,7 +27,8 @@
BITS 64
GLOBAL lrotate:function ; [1]
GLOBAL greet:function ; [1]
GLOBAL greet_s:function ; [1]
GLOBAL greet_m:function ; [1]
GLOBAL asmstr:data asmstr.end-asmstr ; [2]
GLOBAL textptr:data 8 ; [2]
GLOBAL selfptr:data 8 ; [2]
@ -50,10 +51,14 @@ lrotate: ; [1]
pop rbp
ret
; prototype: void greet(void);
;; rdi - rsi - rdx - rcx - r8 - r9
;; rbx, rbp, r12-r15 are saved
greet:
;; prototype: void greet_*(void);
;;
;; Arguments are: rdi - rsi - rdx - rcx - r8 - r9
;; Registers: rbx, rbp, r12-r15 are saved
;; greet_s() is Small PIC model, greet_m() is Medium PIC model
;; (Large model cannot be linked with other code)
;;
greet_s:
mov rax,[rel commvar wrt ..got] ; &commvar
mov rcx,[rax] ; commvar
mov rax,[rel integer wrt ..got] ; &integer
@ -66,6 +71,25 @@ greet:
xor eax,eax ; No fp arguments
jmp printf wrt ..plt ; [10]
greet_m:
push r15 ; Used by convention...
lea r15,[rel _GLOBAL_OFFSET_TABLE_]
mov rax,[rel commvar wrt ..got] ; &commvar
mov rcx,[rax] ; commvar
mov rax,[rel integer wrt ..got] ; &integer
mov rsi,[rax]
lea rdx,[rsi+1]
mov rax,localint wrt ..gotoff ; &localint - r15
mov [rax+r15],rdx ; localint = integer+1
mov rax,localptr wrt ..gotoff ; &localptr - r15
mov rax,[rax+r15] ; localptr
mov rdx,[rax] ; *localptr = localint
mov rdi,printfstr wrt ..gotoff ; &printfstr - r15
add rdi,r15 ; &printfstr
xor eax,eax ; No fp arguments
pop r15
jmp printf wrt ..plt ; [10]
SECTION .data
; a string
@ -77,7 +101,7 @@ printfstr db "integer=%ld, localint=%ld, commvar=%ld", 10, 0
; some pointers
localptr dq localint ; [5] [17]
textptr dq greet wrt ..sym ; [15]
textptr dq greet_s wrt ..sym ; [15]
selfptr dq selfptr wrt ..sym ; [16]
SECTION .bss

9
test/elftest64.c
View File

@ -11,7 +11,8 @@
#include <inttypes.h>
extern long lrotate(long, int);
extern void greet(void);
extern void greet_s(void);
extern void greet_m(void);
extern int8_t asmstr[];
extern void *selfptr;
extern void *textptr;
@ -31,10 +32,10 @@ int main(void)
printf("The integers here should be 1234, 1235 and 4321:\n");
integer = 1234;
commvar = 4321;
greet_s();
greet_m();
greet();
printf("These pointers should be equal: %p and %p\n", &greet, textptr);
printf("These pointers should be equal: %p and %p\n", &greet_s, textptr);
printf("So should these: %p and %p\n", selfptr, &selfptr);