assembly - GDB expressions -

- 

   0x00000000004013fb <+334>:   mov    0x602500(,%rax,8),%rdx

i want know 0x602500(,%rax,8) means.

there source code 

 0x00000000004012fb <+78>:  movq   $0x400a8c,0x2011fa(%rip)        # 0x602500 <func>    0x0000000000401306 <+89>:    movq   $0x400d44,0x2011f7(%rip)        # 0x602508 <func+8>    0x0000000000401311 <+100>:   movq   $0x400faa,0x2011f4(%rip)        # 0x602510 <func+16>    0x000000000040131c <+111>:   movq   $0x401262,0x2011f1(%rip)        # 0x602518 <func+24>    0x0000000000401327 <+122>:   movq   $0x401295,0x2011ee(%rip)        # 0x602520 <func+32>

each 0x400a8c, 400d44, 400faa, 401262 , 401295 address of functions guess 0x602500(,%rax,8) choose proper function execute rax. want make sure guess

from gnu documentation:

https://sourceware.org/binutils/docs/as/i386_002dmemory.html#i386_002dmemory

an intel syntax indirect memory reference of form       section:[base + index*scale + disp]  translated at&t syntax       section:disp(base, index, scale)

in other words:

  1. you derive pointer (compute address) rax, scale = 8

  2. then take offset of 0x602500 address

  3. and write value (the value @ address + 0x602500) %rdx

scale values might 1, 2, 4, or 8: byte, 16-bit, 32-bit or 64-bit.


Comments

Post a Comment

Popular posts from this blog

php - How to display all orders for a single product showing the most recent first? Woocommerce -

-
i have password protected page on frontend. on page, want display full list of purchases associated single woocommerce product id. option 1: i've looked through woocommerce docs , , found: wc_cli_order , list_( $args, $assoc_args ) function lists orders. presumably, orders can filtered product id [--=] filter orders based on order property. line item fields (numeric array, started index zero): line_items.0.product_id option 2: i found article , based on customer id. i've modified code based on guesses meta_key , meta_value. $customer_orders = get_posts( array( 'numberposts' => -1, 'meta_key' => '_product', 'meta_value' => get_product_id(), 'post_type' => wc_get_order_types(), 'post_status' => array_keys( wc_get_order_statuses() ), ) ); how display orders single product showing recent order first? here solution put based on these articles: http://www.w...
Read more

asp.net - How to correctly use QUERY_STRING in ISAPI rewrite? -

-
i'm having difficult time , hope guys can help. using helicon isapi rewrite version 3.1.0.104 on our iis server. edit http.conf file , have tried , still fail. this trying do: redirect url: https://www.domain.com/switch-by-version?version=2.8.5.2594 to: https://test.domain.com/load/load.aspx?tver=2.8.5.2594 the version number @ end source url change, , need target url have same version number @ end of url example above shows. i tried following not work: rewritecond %{query_string} ^version=(\d\d?)\.(\d\d?)\.(\d\d?)\.(.*)$ [nc] rewriterule ^/switch-by-version(.*)$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l] any appreciated! thanks. if it's running in equivalent context of .htaccess , rule shouldn't start / . here's simpler version: rewritecond %{query_string} ^version=(\d+\.\d+\.\d+(?:\..+)?)$ [nc] rewriterule ^switch-by-version/?$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l]
Read more

angularjs - How restrict admin panel using in backend laravel and admin panel on angular? -

-
https://scotch.io/tutorials/token-based-authentication-for-angularjs-and-laravel-apps following tutorials, try write authentication restrict admin panel, didn't understood how can that. this admin panel, admin panel don't want show , request database unauthenticated users. my laravel-routes route::get('/admin',function(){ return view('index'); }); route::get('/api/v1/employees/{id?}', 'employees@index'); route::get('/api/v1/users/{id?}', 'employees@users'); route::post('/api/v1/employees', 'employees@store'); route::post('/api/v1/employees/{id}', 'employees@update'); route::delete('/api/v1/employees/{id}', 'employees@destroy'); route::group(['prefix' => 'api'], function() { route::resource('authenticate', 'authenticatecontroller', ['only' => ['index']]); route::post('authenticate', 'authentic...
Read more