Index
> Non-x86 architectures > [linux] how to arrange for the arguments ioctl? |
| Author |
|
|
revolution 12 Nov 2015, 11:41
sergo_mat: To load arbitrary constants you need to do it in more than one instruction, or use a LDR instruction and load from memory. To access memory pointers close to the code you can use ADR.
Code: EVIOCGKEY = 0x4518 toch_desc = 0x12345678 sys_ioctl = 0x87654321 start_key: stmfd sp!,{r1-r2,r7,lr} ldr r7,[constant_toch_desc] ldr r0,[r7] ldr r1,[constant_EVIOCGKEY] adr r2,newt ldr r7,[constant_sys_ioctl] swi 0 ldmfd sp!,{r1-r2,r7,pc} ;return constant_EVIOCGKEY: dw EVIOCGKEY constant_toch_desc: dw toch_desc constant_sys_ioctl: dw sys_ioctl newt: dw 256 dup(?) |
|||
12 Nov 2015, 11:41 |
|
|
sergo_mat 12 Nov 2015, 11:56
Thank you but the question is that how to arrange for the arguments ioctl
to get data from the touchscreen /dev/input/event0 |
|||
|
12 Nov 2015, 11:56 |
|
|
revolution 12 Nov 2015, 12:09
sergo_mat: Your question appears to be related to your OS. Which OS are you using?
|
|||
|
12 Nov 2015, 12:09 |
|
|
sergo_mat 12 Nov 2015, 12:12
Linux
|
|||
|
12 Nov 2015, 12:12 |
|
|
sergo_mat 12 Nov 2015, 12:14
I have successfully open /dev/input/event0 and get fd
|
|||
|
12 Nov 2015, 12:14 |
|
|
sergo_mat 12 Nov 2015, 12:18
Next, we need to use the argument ioctl EVIOCGKEY and then there is a problem ioctl returns an error FFFFFFEA
|
|||
|
12 Nov 2015, 12:18 |
|
|
Picnic 23 Feb 2016, 09:16
sergo_mat are you trying to get the coordinates of touchscreen?
If you did, can you provide an arm code sample (or give a few more information on how). |
|||
|
23 Feb 2016, 09:16 |
|
|
sergo_mat 20 Jun 2016, 13:34
You can obtain the coordinates tochskreen well as keystrokes but you need to read the size of the virtual file to find out whether or not it was touch
|
|||
|
20 Jun 2016, 13:34 |
|
|
sergo_mat 07 Feb 2021, 09:05
Help, can anyone come across trying to output sound through db "/ dev / snd / pcmC0D0p", 0 when opening decryptor = 3 but I can not write the structure using SNDRV_PCM_IOCTL_HW_PARAMS = _IOWR ('A', 0x11, struct sndrv_pcm4_hw_params
SNDRV_PCM_IOCTL_HW_PARAMS =0xc25c4111 FFFFFFE7-ANSWER |
|||
|
07 Feb 2021, 09:05 |
|
|
Melissa 27 Sep 2021, 13:56
take a look at source code of driver, and modify as needed
|
|||
|
27 Sep 2021, 13:56 |
|
< Last Thread | Next Thread > |
Forum Rules:
|