diff options
Diffstat (limited to 'results/classifier/deepseek-2-tmp/output/mistranslation/1128')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/output/mistranslation/1128 | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/results/classifier/deepseek-2-tmp/output/mistranslation/1128 b/results/classifier/deepseek-2-tmp/output/mistranslation/1128 deleted file mode 100644 index 4d642fbe..00000000 --- a/results/classifier/deepseek-2-tmp/output/mistranslation/1128 +++ /dev/null @@ -1,25 +0,0 @@ - -PPC: `spr_write_xer` doesn't set flag bits in `cpu_xer` -Description of problem: -`spr_write_xer()` does not set the `ca`, `ov`, `so`, `ca32`, `ov32` etc. flag bits in the `cpu_xer` variable. - -In fact it copies all bits from the source `GPR` and _excludes_ each flag bit. - -This is not a problem for execution since `spr_read_xer()` gets the flag bits from `cpu_ca/ov/so...` and not from `cpu_xer`. - -Nonetheless it is problem for tools which trace the execution in QEMU (e.g. https://github.com/BinaryAnalysisPlatform/qemu). - -A fix would be to remove the `~` in https://gitlab.com/qemu-project/qemu/-/blob/master/target/ppc/translate.c#L481 -Steps to reproduce: -Haven't found out yet how to debug QEMU so the TCGv values can be investigated. But in general one need to: - -- Execute a binary which executes something like: -``` -r4 = 0xffffffffffffffff -mtxer r4 -``` -and check the `cpu_xer` value after the `xer` write. - -Checking the debug logs (`in_asm,cpu`) doesn't work, since the `xer` value in the logs is not taken directly from `cpu_xer`. -Additional information: -Code ref: https://gitlab.com/qemu-project/qemu/-/blob/master/target/ppc/translate.c#L480-L483 |