On Sat, 14 Jun 2025 at 13:50, <r...@wjsota.com> wrote: > > Hi! > > Is `qemu-aarch64 -cpu neoverse-n1` supposed to emulate the `retaa` > instruction? > > I have a binary called `main_pac` compiled from > https://learn.arm.com/learning-paths/servers-and-cloud-computing/pac/example/ > . > > The compiling command is `aarch64-linux-gnu-gcc -march=armv8.5-a -fPIC > -pedantic -Wall -Wextra -ggdb3 -O0 -mbranch-protection=standard > -fno-stack-protector -fPIE -static main.c -o main_pac`. The binary includes > the `paciasp` and `retaa` instructions associated with ARM PAC. > > ``` > (gdb) disas main > Dump of assembler code for function main: > 0x0000000000400858 <+0>: paciasp > 0x000000000040085c <+4>: stp x29, x30, [sp, #-32]! > […] > 0x0000000000400898 <+64>: ldp x29, x30, [sp], #32 > 0x000000000040089c <+68>: retaa > End of assembler dump. > (gdb) quit > ``` > > When emulated using `qemu-aarch64 -cpu neoverse-n1` , the program completes > without issues. > ``` > user@dell-op7020:~/learning/arm_learning_path_pac$ qemu-aarch64 -cpu > neoverse-n1 main_pac test > Hello World!
This might be a bug, but why are you compiling for armv8.5 and then trying to run the code on a CPU type that isn't armv8.5 in the first place? thanks -- PMM
