diff options
Diffstat (limited to 'gitlab/issues_text/target_riscv/host_missing/accel_missing/1093')
| -rw-r--r-- | gitlab/issues_text/target_riscv/host_missing/accel_missing/1093 | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/gitlab/issues_text/target_riscv/host_missing/accel_missing/1093 b/gitlab/issues_text/target_riscv/host_missing/accel_missing/1093 deleted file mode 100644 index e7f74b5e5..000000000 --- a/gitlab/issues_text/target_riscv/host_missing/accel_missing/1093 +++ /dev/null @@ -1,33 +0,0 @@ -RISC-V: signal frame is misaligned in signal handlers -Description of problem: -`qemu-user` misaligns the signal frame (to 4 bytes rather than 16 bytes) on RISC-V 64, e.g causing pointer misalignment diagnostics to be triggered by UBSan. -Steps to reproduce: -1. Create a C file with the following contents: -```c -#include <signal.h> -#include <stdio.h> - -void handler(int sig, siginfo_t *info, void *context) { - printf("signal occurred, info: %p, context: %p\n", info, context); -} - -int main() { - struct sigaction act; - act.sa_flags = SA_SIGINFO; - act.sa_sigaction = handler; - sigaction(SIGINT, &act, NULL); - - // Deliberately misalign the stack - asm volatile ("addi sp, sp, -4"); - - while(1); - // Unreachable -} -``` -2. Compile with an appropriate RISC-V toolchain and run with `qemu-riscv64 ./a.out`. -3. Send a `SIGINT` (e.g by hitting Ctrl-C), and observe that the signal frame will be misaligned: -``` -signal occurred, info: 0x400080025c, context: 0x40008002dc -``` -Additional information: -This issue is alluded to in the source code, see https://gitlab.com/qemu-project/qemu/-/blob/master/linux-user/riscv/signal.c#L68-69. It should be sufficient to change that constant to 15. |