Pt_regs struct in Linux

The pt_regs parameter required for the system call is defined in the include/asm-i386/ptrace. h file:
Struct pt_regs {
Long EBX; // pointer to the executable file path (in regs. EBX
Long ECx; // pointer to the command line parameter (in regs. ECx)
Long edX; // environment variable pointer (in regs. EDX ).
Long ESI;
Long EDI;
Long EBP;
Long eax;
Int xds;
Int xes;
Long orig_eax;
Long EIP;
Int XCS;
Long eflags;
Long ESP;
Int XSS;
};
This parameter describes how the CPU registers in the user State are stored in the core State stack when the system call is executed. With this parameter, sys_execve can obtain the following information stored in the user space: the executable file path pointer (regs. in EBX), command line parameter pointer (regs. in ECx) and environment variable pointer (regs. in EDX ).