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Issue with AAPCS (ie parameters passing to a function) for gcc 11

Ayan Kr over 3 years ago

Refer the following disassembly :-

set_boot_mpumap(next_xen_mpumap_index, (uint32_t) boot_mpumap);

a2c44: e30b2000 movw r2, #45056 ; 0xb000

a2c48: e3402008 movt r2, #8

a2c4c: e5940000 ldr r0, [r4]

a2c50: e3a01000 mov r1, #0 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< ---------------Problem

a2c54: ebfedae2 bl 597e4 <set_boot_mpumap>

The address of boot_mpumap = 0x8b000 is being passed via r2 and r1 is

set to 0.

This causes the issue as set_boot_mpumap() expects r1 to have the value of boot_mpumap.

I am using the below version of toolchain.

ayan@ayan-Lenovo-V15-IIL:~/xen_r52/r82_mpu_gitlab$

arm-none-linux-gnueabihf-gcc -v

Using built-in specs.

COLLECT_GCC=arm-none-linux-

gnueabihf-gcc

COLLECT_LTO_WRAPPER=/home/ayan/xen_r52/gcc-arm-11.2-2022.02-x86_64-arm-none-linux-gnueabihf/bin/../libexec/gcc/arm-none-linux-gnueabihf/11.2.1/lto-wrapper

Target: arm-none-linux-gnueabihf

Configured with:

/data/jenkins/workspace/GNU-toolchain/arm-11/src/gcc/configure

--target=arm-none-linux-gnueabihf --prefix=

--with-sysroot=/arm-none-linux-gnueabihf/libc

--with-build-sysroot=/data/jenkins/workspace/GNU-toolchain/arm-11/build-arm-none-linux-gnueabihf/install//arm-none-linux-gnueabihf/libc

--with-bugurl=https://bugs.linaro.org/

<https://bugs.linaro.org/>--enable-gnu-indirect-function --enable-shared

--disable-libssp --disable-libmudflap --enable-checking=release

--enable-languages=c,c++,fortran

--with-gmp=/data/jenkins/workspace/GNU-toolchain/arm-11/build-arm-none-linux-gnueabihf/host-tools

--with-mpfr=/data/jenkins/workspace/GNU-toolchain/arm-11/build-arm-none-linux-gnueabihf/host-tools

--with-mpc=/data/jenkins/workspace/GNU-toolchain/arm-11/build-arm-none-linux-gnueabihf/host-tools

--with-isl=/data/jenkins/workspace/GNU-toolchain/arm-11/build-arm-none-linux-gnueabihf/host-tools

--with-arch=armv7-a --with-fpu=neon --with-float=hard --with-mode=thumb

--with-arch=armv7-a --with-pkgversion='GNU Toolchain for the Arm

Architecture 11.2-2022.02 (arm-11.14)'

Thread model: posix

Supported LTO compression algorithms: zlib

gcc version 11.2.1 20220111 (GNU Toolchain for the Arm Architecture

11.2-2022.02 (arm-11.14))

Any hints ?