C programming tips in SPARC architecture

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原创最新推荐文章于 2023-05-26 16:54:54 发布 980 阅读 AI 写同款· GEO 优化 ›

一个变量越界导致破坏堆栈的bug 前一段时间在商用系统上出现了core dump，原因是由于一个局部变量写越界导致堆栈被破坏了。在这里，我把这个bug分享一下，希望给需要的朋友一点帮助。简化的代码如下： typedef struct { ...... } A; void func1(char *p) { ...... } void main(void) { A a; A *p = &a; char b[10]; 阅读详情

If you are a newbie of C programmers in SPARC architecture (For example, working on Solaris), you should pay attention to the following tips:

(1) By default, SPARC is big-endian (For Endianness, you can refer http://en.wikipedia.org/wiki/Endianness). It means for an integer (short, int, long, etc), the MSB will be stored in the lower address, while the LSB will be stored in the higher address.

(2) SPARC requires byte-alignment. It means for a short (2 bytes long) variable, the start address of the variable must be the multiples of 2, while a int (4 bytes long) variable, the start address of the variable must be the multiples of 4. If the address can't satisfy this condition, the application will core dump, and a "Bus Error" will be reported. For this tip, you can refer Expert C Programming: Deep C Secrets (Bus Error section, page 163 ~ page 164).

For more SPARC information, you can refer:

http://en.wikipedia.org/wiki/SPARC;

SPARC Processor Issues.