enhanced syscall macros
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@ -377,6 +377,35 @@ typedef DIR qse_dir_t;
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#include <sys/syscall.h>
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/*
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http://www.x86-64.org/documentation/abi.pdf
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A.2 AMD64 Linux Kernel Conventions
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The section is informative only.
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A.2.1 Calling Conventions
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The Linux AMD64 kernel uses internally the same calling conventions as user-
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level applications (see section 3.2.3 for details). User-level applications
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that like to call system calls should use the functions from the C library.
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The interface between the C library and the Linux kernel is the same as for
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the user-level applications with the following differences:
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1. User-level applications use as integer registers for passing the sequence
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%rdi, %rsi, %rdx, %rcx, %r8 and %r9. The kernel interface uses %rdi,
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%rsi, %rdx, %r10, %r8 and %r9.
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2. A system-call is done via the syscall instruction. The kernel destroys
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registers %rcx and %r11.
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3. The number of the syscall has to be passed in register %rax.
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4. System-calls are limited to six arguments, no argument is passed directly
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on the stack.
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5. Returning from the syscall, register %rax contains the result of the
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system-call. A value in the range between -4095 and -1 indicates an error,
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it is -errno.
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6. Only values of class INTEGER or class MEMORY are passed to the kernel.
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*/
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/*
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#define QSE_SYSCALL0(ret,num) \
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__asm__ volatile ( \
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@ -422,28 +451,41 @@ typedef DIR qse_dir_t;
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"syscall\n" \
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: "=a"(ret) \
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: "a"((qse_uint64_t)num) \
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: "%rcx", "%r11")
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: "memory", "cc", "%rcx", "%r11" \
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)
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#define QSE_SYSCALL1(ret,num,arg1) \
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__asm__ volatile ( \
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"syscall\n" \
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: "=a"(ret) \
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: "a"((qse_uint64_t)num), "D"((qse_uint64_t)arg1) \
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: "%rcx", "%r11")
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: "memory", "cc", "%rcx", "%r11" \
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)
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#define QSE_SYSCALL2(ret,num,arg1,arg2) \
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__asm__ volatile ( \
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"syscall\n" \
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: "=a"(ret) \
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: "a"((qse_uint64_t)num), "D"((qse_uint64_t)arg1), "S"((qse_uint64_t)arg2) \
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: "%rcx", "%r11")
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: "memory", "cc", "%rcx", "%r11" \
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)
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#define QSE_SYSCALL3(ret,num,arg1,arg2,arg3) \
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__asm__ volatile ( \
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"syscall\n" \
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: "=a"(ret) \
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: "a"((qse_uint64_t)num), "D"((qse_uint64_t)arg1), "S"((qse_uint64_t)arg2), "d"((qse_uint64_t)arg3) \
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: "%rcx", "%r11")
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: "memory", "cc", "%rcx", "%r11" \
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)
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#define QSE_SYSCALL4(ret,num,arg1,arg2,arg3,arg4) \
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__asm__ volatile ( \
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"syscall\n" \
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: "=a"(ret) \
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: "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) \
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: "memory", "cc", "%rcx", "%r11" \
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)
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#elif defined(__linux) && defined(__GNUC__) && defined(__i386)
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@ -454,14 +496,17 @@ typedef DIR qse_dir_t;
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"int $0x80\n" \
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: "=a"(ret) \
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: "a"((qse_uint32_t)num) \
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: "memory")
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: "memory" \
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)
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/*
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#define QSE_SYSCALL1(ret,num,arg1) \
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__asm__ volatile ( \
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"int $0x80\n" \
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: "=a"(ret) \
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: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1))
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: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1) \
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: "memory" \
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)
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GCC in x86 PIC mode uses ebx to store the GOT table. so the macro shouldn't
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clobber the ebx register. this modified version stores ebx before interrupt
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@ -475,14 +520,17 @@ and restores it after interrupt.
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"pop %%ebx\n" \
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: "=a"(ret) \
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: "a"((qse_uint32_t)num), "r"((qse_uint32_t)arg1) \
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: "memory")
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: "memory" \
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)
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/*
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#define QSE_SYSCALL2(ret,num,arg1,arg2) \
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__asm__ volatile ( \
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"int $0x80\n" \
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: "=a"(ret) \
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: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2))
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: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2) \
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: "memory" \
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)
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*/
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#define QSE_SYSCALL2(ret,num,arg1,arg2) \
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__asm__ volatile ( \
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@ -492,14 +540,17 @@ and restores it after interrupt.
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"pop %%ebx\n" \
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: "=a"(ret) \
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: "a"((qse_uint32_t)num), "r"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2) \
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: "memory")
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: "memory" \
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)
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/*
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#define QSE_SYSCALL3(ret,num,arg1,arg2,arg3) \
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__asm__ volatile ( \
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"int $0x80\n" \
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: "=a"(ret) \
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: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2), "d"((qse_uint32_t)arg3))
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: "a"((qse_uint32_t)num), "b"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2), "d"((qse_uint32_t)arg3) \
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: "memory" \
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)
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*/
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#define QSE_SYSCALL3(ret,num,arg1,arg2,arg3) \
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__asm__ volatile ( \
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@ -509,7 +560,19 @@ and restores it after interrupt.
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"pop %%ebx\n" \
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: "=a"(ret) \
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: "a"((qse_uint32_t)num), "r"((qse_uint32_t)arg1), "c"((qse_uint32_t)arg2), "d"((qse_uint32_t)arg3) \
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: "memory")
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: "memory" \
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)
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#define QSE_SYSCALL4(ret,num,arg1,arg2,arg3,arg4) \
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__asm__ volatile ( \
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"push %%ebx\n" \
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"movl %2, %%ebx\n" \
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"int $0x80\n" \
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"pop %%ebx\n" \
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: "=a"(ret) \
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: "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) \
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: "memory" \
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)
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#endif
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