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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-07-08 13:28:15 +0200 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-07-08 13:28:28 +0200 |
| commit | 5aa276efcbd67f4300ca1a7f809c6e00aadb03da (patch) | |
| tree | 9b8f0e074014cda8d42f5a97a95bc25082d8b764 /results/classifier/zero-shot-user-mode/instruction/1233225 | |
| parent | 1a3c4faf4e0a25ed0b86e8739d5319a634cb9112 (diff) | |
| download | emulator-bug-study-5aa276efcbd67f4300ca1a7f809c6e00aadb03da.tar.gz emulator-bug-study-5aa276efcbd67f4300ca1a7f809c6e00aadb03da.zip | |
restructure results
Diffstat (limited to 'results/classifier/zero-shot-user-mode/instruction/1233225')
| -rw-r--r-- | results/classifier/zero-shot-user-mode/instruction/1233225 | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/results/classifier/zero-shot-user-mode/instruction/1233225 b/results/classifier/zero-shot-user-mode/instruction/1233225 new file mode 100644 index 00000000..cadb2201 --- /dev/null +++ b/results/classifier/zero-shot-user-mode/instruction/1233225 @@ -0,0 +1,30 @@ +instruction: 0.521 +runtime: 0.297 +syscall: 0.181 + + + +mips/mipsel linux user float division problem + +Hi, + +I tested the following with the qemu git HEAD as of 2013-09-30 on Debian stable and testing. My host runs amd64 but I also tried this out inside a i386 chroot with the same result. The problem occurs for mips and mipsel. Given the following program: + +#include <stdio.h> +int main(int argc, char **argv) +{ + int a = 1; + double d = a/2.0; + printf("%f\n", d); + return 0; +} + +Instead of printing 0.5, it will print 2.0 if executed in qemu user mode. + +$ mipsel-linux-gnu-gcc mipstest.c +$ ~/qemu/mipsel-linux-user/qemu-mipsel ./a.out +2.0 + +Expecting this to be a problem with my cross compiler (gcc-4.4 from emdebian) I ran a fully emulated debian squeeze environment inside qemu. There, I compiled the same program natively with gcc and as expected got 0.5 as the output. I also copied the cross compiled binary inside the emulated environment and also got 0.5 when I ran it. So the same mips/mipsel binary produces different output depending on whether it is run in a fully emulated environment or qemu user mode. + +Can anybody else reproduce this problem? \ No newline at end of file |
