Talk:Inline Assembly/Examples: Difference between revisions
Latest comment: 13 years ago by Love4boobies
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}</pre> |
}</pre> |
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--[[User:Quok|quok]] 19:17, 2 May 2009 (UTC) |
--[[User:Quok|quok]] 19:17, 2 May 2009 (UTC) |
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I see some problems with this article: |
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:1. It only provides GCC inline assembly. |
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:2. It uses GCC-specific extensions although the "inline" keyword was introduced in C99. |
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:'''3. More importantly, everything here is more suited as a macro than inline assembly. It is important to understand that "inline" is just a compiler hint and may be ignored entirely as far as optimizations go (and probably will). The only thing one can be sure of is that a pointer to the function cannot be obtained.''' |
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:4. I/O support is directly supported in C (TR 1169). |
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It would be nice if someone explained why this article is neccessary. |
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--[[User:Love4boobies|Love4boobies]] 05:44, 10 March 2011 (UTC) |
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Revision as of 05:44, 10 March 2011
Rolled back edit by imate900 that added the following lgdt function, which is wrong for many reasons. I just did not have time to fix the example yet.
void *lgdt(void *gdt, int entries)
{
struct { unsigned short *length, void *base } gdtr_t;
gdtr_t *gdtr;
gdtr.length = entries;
gdtr.base = gdt;
asm("lgdt (%0)": : "p" (&gdtr));
asm("mov %ax, 0x10");
asm("mov %ds, %ax");
asm("mov %es, %ax");
asm("mov %fs, %ax");
asm("mov %gs, %ax");
asm("mov %ss, %ax");
goto fix_cs;
fix_cs:
return;
}
--quok 19:17, 2 May 2009 (UTC)
I see some problems with this article:
- 1. It only provides GCC inline assembly.
- 2. It uses GCC-specific extensions although the "inline" keyword was introduced in C99.
- 3. More importantly, everything here is more suited as a macro than inline assembly. It is important to understand that "inline" is just a compiler hint and may be ignored entirely as far as optimizations go (and probably will). The only thing one can be sure of is that a pointer to the function cannot be obtained.
- 4. I/O support is directly supported in C (TR 1169).
It would be nice if someone explained why this article is neccessary. --Love4boobies 05:44, 10 March 2011 (UTC)