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| ID | Category | Severity | Reproducibility | Date Submitted | Last Update | ||||
| 0002454 | [uClibc] Architecture Specific | major | always | 03-06-08 04:12 | 10-16-08 07:47 | ||||
| Reporter | Joe Lin | View Status | public | ||||||
| Assigned To | uClibc | ||||||||
| Priority | normal | Resolution | unable to reproduce | ||||||
| Status | closed | Product Version | 0.9.28.1 | ||||||
| Summary | 0002454: Fixing ARM EABI support bug in syscall() | ||||||||
| Description |
When making an EABI syscall() system call, the library does not correctly pass requesting system number to the Linux kernel. For example, the ping facility in Busybox will issue a syscall() to get monotonic time (see monotonic_us() in libbb/time.c). The syscall() in syscall-eabi.S passes R7 value verbatim. But the kernel (see linux's vector_swi routine in arch/arm/kernel/entry-common.S) expects R7 a number without __NR_SYSCALL_BASE. This bug caused a Segmentation Fault. Below is the patch. -------------------------------------------------------------- diff -Naurd uClibc-0.9.29/libc/sysdeps/linux/arm/syscall-eabi.S uClibc-0.9.29-p1/libc/sysdeps/linux/arm/syscall-eabi.S --- uClibc-0.9.29/libc/sysdeps/linux/arm/syscall-eabi.S 2006-02-11 12:29:52.000000000 +0800 +++ uClibc-0.9.29-p1/libc/sysdeps/linux/arm/syscall-eabi.S 2008-03-06 19:53:15.000000000 +0800 @@ -29,7 +29,7 @@ syscall: mov ip, sp stmfd sp!, {r4, r5, r6, r7} - mov r7, r0 + sub r7, r0, #SYS_SYSCALL_BASE mov r0, r1 mov r1, r2 mov r2, r3 -------------------------------------------------------------- |
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Notes |
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(0006484) khem 04-09-08 00:07 |
is your kernel compiled with AEABI ? Are you compiling uclibc also with EABI turned on in toolchain ? |
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(0006504) Joe Lin 04-09-08 19:22 |
Yes, I compiled both kernel and uClibc with EABI turned on. If uClibc was compiled in OABI, it would go through different path in kernel, which got no problem. If kernel was not compiled to process EABI executables, EABI programs would not work. |
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(0006554) khem 04-10-08 19:12 |
I do not get segmentation fault on using busybox applet ping. |
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(0006604) Joe Lin 04-13-08 18:39 |
No segmentation fault? My code runs with the patch ok, which means it should get the fault if without the patch. I'll take a time to review the exact point of problem using my hardware ICE. For now I just can't remember where the instruction is in the arch/arm/kernel/entry-common.S. Will report the point then. |
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(0012664) bernhardf 10-03-08 08:04 |
Any update? |
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(0013234) khem 10-11-08 02:33 |
ping works fine on EABI system running kernel 2.6.25 and latest uClibc SVN. So I am closing this issue as we can not reproduce it. If there is more information to reproduce this problem feel free to reopen it. |
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(0013714) bernhardf 10-16-08 07:47 |
This is closed, so close it. |
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Issue History |
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| Date Modified | Username | Field | Change |
| 03-06-08 04:12 | Joe Lin | New Issue | |
| 03-06-08 04:12 | Joe Lin | Status | new => assigned |
| 03-06-08 04:12 | Joe Lin | Assigned To | => uClibc |
| 04-09-08 00:07 | khem | Note Added: 0006484 | |
| 04-09-08 19:22 | Joe Lin | Note Added: 0006504 | |
| 04-10-08 19:12 | khem | Note Added: 0006554 | |
| 04-13-08 18:39 | Joe Lin | Note Added: 0006604 | |
| 10-03-08 08:04 | bernhardf | Note Added: 0012664 | |
| 10-11-08 02:33 | khem | Status | assigned => resolved |
| 10-11-08 02:33 | khem | Fixed in Version | => 0.9.30 |
| 10-11-08 02:33 | khem | Resolution | open => unable to reproduce |
| 10-11-08 02:33 | khem | Note Added: 0013234 | |
| 10-16-08 07:47 | bernhardf | Status | resolved => closed |
| 10-16-08 07:47 | bernhardf | Note Added: 0013714 | |
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