Databases
StackOverflow2013
Postsdbo
POHow to use RIP Relative Addressing in a 64-bit assembly program?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to use RIP Relative Addressing in a 64-bit assembly program?
    primarykey
    data
    text
    <p>How do I use RIP Relative Addressing in a Linux assembly program for the AMD64 archtitecture? I am looking for a simple example (a Hello world program) that uses the AMD64 RIP relative adressing mode.</p> <p>For example the following 64-bit assembly program would work with normal (absolute addressing):</p> <pre><code>.text .global _start _start: mov $0xd, %rdx mov $msg, %rsi pushq $0x1 pop %rax mov %rax, %rdi syscall xor %rdi, %rdi pushq $0x3c pop %rax syscall .data msg: .ascii "Hello world!\n" </code></pre> <p>I am guessing that the same program using RIP Relative Addressing would be something like:</p> <pre><code>.text .global _start _start: mov $0xd, %rdx mov msg(%rip), %rsi pushq $0x1 pop %rax mov %rax, %rdi syscall xor %rdi, %rdi pushq $0x3c pop %rax syscall msg: .ascii "Hello world!\n" </code></pre> <p>The normal version runs fine when compiled with:</p> <pre><code>as -o hello.o hello.s &amp;&amp; ld -s -o hello hello.o &amp;&amp; ./hello </code></pre> <p>But I can't get the RIP version working.</p> <p>Any ideas?</p> <p>--- edit ----</p> <p>Stephen Canon's answer makes the RIP version work.</p> <p>Now when I disassemble the executable of the RIP version I get:</p> <p>objdump -d hello</p> <pre><code>0000000000400078 &lt;.text&gt;: 400078: 48 c7 c2 0d 00 00 00 mov $0xd,%rdx 40007f: 48 8d 35 10 00 00 00 lea 0x10(%rip),%rsi # 0x400096 400086: 6a 01 pushq $0x1 400088: 58 pop %rax 400089: 48 89 c7 mov %rax,%rdi 40008c: 0f 05 syscall 40008e: 48 31 ff xor %rdi,%rdi 400091: 6a 3c pushq $0x3c 400093: 58 pop %rax 400094: 0f 05 syscall 400096: 48 rex.W 400097: 65 gs 400098: 6c insb (%dx),%es:(%rdi) 400099: 6c insb (%dx),%es:(%rdi) 40009a: 6f outsl %ds:(%rsi),(%dx) 40009b: 20 77 6f and %dh,0x6f(%rdi) 40009e: 72 6c jb 0x40010c 4000a0: 64 21 0a and %ecx,%fs:(%rdx) </code></pre> <p>Which shows what I was trying to accomplish: lea 0x10(%rip),%rsi loads the address 17 bytes after the lea instruction which is address 0x400096 where the Hello world string can be found and thus resulting in position independent code.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCiro Santilli 新疆改造中心 六四事件 法轮功
    1. USErik
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow to use RIP Relative Addressing in a 64-bit assembly program?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POHow to use RIP Relative Addressing in a 64-bit assembly program?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POHow to use RIP Relative Addressing in a 64-bit assembly program?
      1. USErik
      1. VTFavorite
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload