what's the difference between iret and iretd,iretq?
2012年8月2日 · IRET returns from an interrupt (hardware or software) by means of popping IP (or EIP), CS, and the flags off the stack and then continuing execution from the new CS:IP. …
x86 - Switching to User-mode using iret - Stack Overflow
2016年6月3日 · iret works by undoing steps 1-3 (The ISR is responsible for undoing step 4 if necessary). We can use this fact to get to ring 3 by pushing the required information to the …
What is the difference between the instructions STI, RET and IRET …
2021年5月20日 · iret is complex - its behavior depends on many things (CPU mode, return info, etc) and in some cases it might do a full hardware task switch (changing every general …
Trouble finding source of General Protection Fault after IRET …
2022年8月22日 · The return address of the iret points to a valid location inside my kernel code. When using gdb , if I step instructionwise, the GPF happens exactly as I execute the iret , all …
assembly - Why does iret from a page fault handler generate …
2012年5月14日 · EDIT: From the picture it's apparent that the page fault handler didn't remove the exception code (value of 4 at address in ESP) before executing IRET. And so IRET interpreted …
Must IRET be used when returning from an interrupt?
2012年5月5日 · IRET can restore the registers from the stack,including EFLAGS, ESP, EIP and so on, but we can also restore the registers all by ourselves. For example, "movl" can be used …
how to simulate a iret on linux x86_64 - Stack Overflow
2012年8月1日 · Does iret care if the cs and ss it pops are correctly zero-extended? You should just be able to movl %%ss, %%eax to get a mov with no operand-size prefix, which will zero …
Stack for iret and int instruction
2012年10月22日 · An interrupt causes the CPU to save the EFLAGS, CS and IP registers onto the "stack" and the iret instruction pops them off it. Where is this stack located? How does the …
Who calls IRET after context switch in Linux Kernel?
2015年10月26日 · If an exact IRET frame does not exist because of the particular syscall mechanism used, one is assembled. When the kernel needs to resume A, the kernel reloads …
Use of iret when returning from exec system call
IRET is our most capable (but slowest) syscall * return path, which is able to restore modified SS, CS and certain * EFLAGS values that other (fast) syscall return instructions * are not able to …