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Start working on memory-mapped files.

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First of all, change sys$mmap to take a struct SC_mmap_params since our
sycsall calling convention can't handle more than 3 arguments.

This exposed a bug in Syscall::invoke() needing to use clobber lists.
It was a bit confusing to debug. :^)
This commit is contained in:
Andreas Kling 2018-11-08 11:37:01 +01:00
parent 41a751c90c
commit fdbd9f1e27
14 changed files with 82 additions and 26 deletions
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17
Kernel/Syscall.h
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@ -82,33 +82,42 @@ inline constexpr const char* toString(Function function)
return "Unknown";
}
struct SC_mmap_params {
uint32_t addr;
uint32_t size;
int32_t prot;
int32_t flags;
int32_t fd;
uint32_t offset; // FIXME: 64-bit off_t?
};
void initialize();
inline dword invoke(dword function)
{
dword result;
asm volatile("int $0x80":"=a"(result):"a"(function));
asm volatile("int $0x80":"=a"(result):"a"(function):"memory");
return result;
}
inline dword invoke(dword function, dword arg1)
{
dword result;
asm volatile("int $0x80":"=a"(result):"a"(function),"d"(arg1));
asm volatile("int $0x80":"=a"(result):"a"(function),"d"(arg1):"memory");
return result;
}
inline dword invoke(dword function, dword arg1, dword arg2)
{
dword result;
asm volatile("int $0x80":"=a"(result):"a"(function),"d"(arg1),"c"(arg2));
asm volatile("int $0x80":"=a"(result):"a"(function),"d"(arg1),"c"(arg2):"memory");
return result;
}
inline dword invoke(dword function, dword arg1, dword arg2, dword arg3)
{
dword result;
asm volatile("int $0x80":"=a"(result):"a"(function),"d"(arg1),"c"(arg2),"b"(arg3));
asm volatile("int $0x80":"=a"(result):"a"(function),"d"(arg1),"c"(arg2),"b"(arg3):"memory");
return result;
}