enhanced syscall macros
This commit is contained in:
parent
4c2df3b4dd
commit
1f0e2e081e
@ -377,6 +377,35 @@ typedef DIR qse_dir_t;
|
||||
|
||||
#include <sys/syscall.h>
|
||||
|
||||
/*
|
||||
|
||||
http://www.x86-64.org/documentation/abi.pdf
|
||||
|
||||
A.2 AMD64 Linux Kernel Conventions
|
||||
The section is informative only.
|
||||
|
||||
A.2.1 Calling Conventions
|
||||
The Linux AMD64 kernel uses internally the same calling conventions as user-
|
||||
level applications (see section 3.2.3 for details). User-level applications
|
||||
that like to call system calls should use the functions from the C library.
|
||||
The interface between the C library and the Linux kernel is the same as for
|
||||
the user-level applications with the following differences:
|
||||
|
||||
1. User-level applications use as integer registers for passing the sequence
|
||||
%rdi, %rsi, %rdx, %rcx, %r8 and %r9. The kernel interface uses %rdi,
|
||||
%rsi, %rdx, %r10, %r8 and %r9.
|
||||
2. A system-call is done via the syscall instruction. The kernel destroys
|
||||
registers %rcx and %r11.
|
||||
3. The number of the syscall has to be passed in register %rax.
|
||||
4. System-calls are limited to six arguments, no argument is passed directly
|
||||
on the stack.
|
||||
5. Returning from the syscall, register %rax contains the result of the
|
||||
system-call. A value in the range between -4095 and -1 indicates an error,
|
||||
it is -errno.
|
||||
6. Only values of class INTEGER or class MEMORY are passed to the kernel.
|
||||
|
||||
*/
|
||||
|
||||
/*
|
||||
#define QSE_SYSCALL0(ret,num) \
|
||||
__asm__ volatile ( \
|
||||
@ -421,29 +450,42 @@ typedef DIR qse_dir_t;
|
||||
__asm__ volatile ( \
|
||||
"syscall\n" \
|
||||
: "=a"(ret) \
|
||||
:"a"((qse_uint64_t)num) \
|
||||
: "%rcx", "%r11")
|
||||
: "a"((qse_uint64_t)num) \
|
||||
: "memory", "cc", "%rcx", "%r11" \
|
||||
)
|
||||
|
||||
|
||||
#define QSE_SYSCALL1(ret,num,arg1) \
|
||||
__asm__ volatile ( \
|
||||
"syscall\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint64_t)num), "D"((qse_uint64_t)arg1) \
|
||||
: "%rcx", "%r11")
|
||||
: "memory", "cc", "%rcx", "%r11" \
|
||||
)
|
||||
|
||||
#define QSE_SYSCALL2(ret,num,arg1,arg2) \
|
||||
__asm__ volatile ( \
|
||||
"syscall\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint64_t)num), "D"((qse_uint64_t)arg1), "S"((qse_uint64_t)arg2) \
|
||||
: "%rcx", "%r11")
|
||||
: "memory", "cc", "%rcx", "%r11" \
|
||||
)
|
||||
|
||||
#define QSE_SYSCALL3(ret,num,arg1,arg2,arg3) \
|
||||
__asm__ volatile ( \
|
||||
"syscall\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint64_t)num), "D"((qse_uint64_t)arg1), "S"((qse_uint64_t)arg2), "d"((qse_uint64_t)arg3) \
|
||||
: "%rcx", "%r11")
|
||||
: "memory", "cc", "%rcx", "%r11" \
|
||||
)
|
||||
|
||||
#define QSE_SYSCALL4(ret,num,arg1,arg2,arg3,arg4) \
|
||||
__asm__ volatile ( \
|
||||
"syscall\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint64_t)num), "D"((qse_uint64_t)arg1), "S"((qse_uint64_t)arg2), "d"((qse_uint64_t)arg3), "c"((qse_uint64_t)arg4) \
|
||||
: "memory", "cc", "%rcx", "%r11" \
|
||||
)
|
||||
|
||||
#elif defined(__linux) && defined(__GNUC__) && defined(__i386)
|
||||
|
||||
@ -454,14 +496,17 @@ typedef DIR qse_dir_t;
|
||||
"int $0x80\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint32_t)num) \
|
||||
: "memory")
|
||||
: "memory" \
|
||||
)
|
||||
|
||||
/*
|
||||
#define QSE_SYSCALL1(ret,num,arg1) \
|
||||
__asm__ volatile ( \
|
||||
"int $0x80\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1))
|
||||
: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1) \
|
||||
: "memory" \
|
||||
)
|
||||
|
||||
GCC in x86 PIC mode uses ebx to store the GOT table. so the macro shouldn't
|
||||
clobber the ebx register. this modified version stores ebx before interrupt
|
||||
@ -475,14 +520,17 @@ and restores it after interrupt.
|
||||
"pop %%ebx\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint32_t)num), "r"((qse_uint32_t)arg1) \
|
||||
: "memory")
|
||||
: "memory" \
|
||||
)
|
||||
|
||||
/*
|
||||
#define QSE_SYSCALL2(ret,num,arg1,arg2) \
|
||||
__asm__ volatile ( \
|
||||
"int $0x80\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2))
|
||||
: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2) \
|
||||
: "memory" \
|
||||
)
|
||||
*/
|
||||
#define QSE_SYSCALL2(ret,num,arg1,arg2) \
|
||||
__asm__ volatile ( \
|
||||
@ -492,14 +540,17 @@ and restores it after interrupt.
|
||||
"pop %%ebx\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint32_t)num), "r"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2) \
|
||||
: "memory")
|
||||
: "memory" \
|
||||
)
|
||||
|
||||
/*
|
||||
#define QSE_SYSCALL3(ret,num,arg1,arg2,arg3) \
|
||||
__asm__ volatile ( \
|
||||
"int $0x80\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2), "d"((qse_uint32_t)arg3))
|
||||
: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2), "d"((qse_uint32_t)arg3) \
|
||||
: "memory" \
|
||||
)
|
||||
*/
|
||||
#define QSE_SYSCALL3(ret,num,arg1,arg2,arg3) \
|
||||
__asm__ volatile ( \
|
||||
@ -509,7 +560,19 @@ and restores it after interrupt.
|
||||
"pop %%ebx\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint32_t)num), "r"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2), "d"((qse_uint32_t)arg3) \
|
||||
: "memory")
|
||||
: "memory" \
|
||||
)
|
||||
|
||||
#define QSE_SYSCALL4(ret,num,arg1,arg2,arg3,arg4) \
|
||||
__asm__ volatile ( \
|
||||
"push %%ebx\n" \
|
||||
"movl %2, %%ebx\n" \
|
||||
"int $0x80\n" \
|
||||
"pop %%ebx\n" \
|
||||
: "=a"(ret) \
|
||||
: "a"((qse_uint32_t)num), "r"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2), "d"((qse_uint32_t)arg3), "S"((qse_uint32_t)arg4) \
|
||||
: "memory" \
|
||||
)
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user