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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/11/15 07:30:46 UTC
[GitHub] [incubator-nuttx] xiaotailang opened a new issue, #7598: mpu protected mode debug
xiaotailang opened a new issue, #7598:
URL: https://github.com/apache/incubator-nuttx/issues/7598
Under mpu protected mode, I added a new system call, But appeared a panic , and I tried to debug, but when using gdb tracing, only the code in kernel mode can be traced, and the code in application mode cannot be traced. So I want to know in mpu protected mode, how does gdb track the code of application state and kernel state at the same time.
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[GitHub] [incubator-nuttx] superxyxiao commented on issue #7598: mpu protected mode debug
Posted by GitBox <gi...@apache.org>.
superxyxiao commented on issue #7598:
URL: https://github.com/apache/incubator-nuttx/issues/7598#issuecomment-1316362182
Is there any document about adding new system calls under the protection of mpu? I add a new system call in the following file, but when debugging, I found that the address of the new system call in the g_stublookup array is 0.
path/syscall/syscall_lookup.h:SYSCALL_LOOKUP(mycall, 0, STUB_mycall)
path/syscall/syscall_stublookup.c:uintptr_t STUB_mycall(int nbr);
path/syscall/syscall.csv:"mycall","nuttx/mycall.h","","int"
cat path/include/nuttx/mycall.h
#ifndef __ASSEMBLY__
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
int mycall(void);
#undef EXTERN
#ifdef __cplusplus
}
#endif
path/include/sys/syscall.h
#define SYS_mycall (SYS_prctl + 1)
#define SYS_maxsyscall (SYS_prctl + 2)
cat path/sched/mycall/mycall.c
#include <nuttx/compiler.h>
#include <nuttx/mycall.h>
int mycall(void)
{
int num=0;
num=num+2;
return num;
}
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[GitHub] [incubator-nuttx] patacongo commented on issue #7598: mpu protected mode debug
Posted by GitBox <gi...@apache.org>.
patacongo commented on issue #7598:
URL: https://github.com/apache/incubator-nuttx/issues/7598#issuecomment-1315262279
Can't you just add the symbol table for the user space to GDB using the add-symbol-file command?
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[GitHub] [incubator-nuttx] superxyxiao commented on issue #7598: mpu protected mode debug
Posted by GitBox <gi...@apache.org>.
superxyxiao commented on issue #7598:
URL: https://github.com/apache/incubator-nuttx/issues/7598#issuecomment-1316466364
I use version is nuttx-8.2
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[GitHub] [nuttx] xiaoxiang781216 commented on issue #7598: mpu protected mode debug
Posted by GitBox <gi...@apache.org>.
xiaoxiang781216 commented on issue #7598:
URL: https://github.com/apache/nuttx/issues/7598#issuecomment-1340371415
@superxyxiao nuttx-8.2 is a very old release(2019/11), why not use the last dev branch?
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