kaguya
124 lines
3.7 KiB
C++
124 lines
3.7 KiB
C++
#include <bits/syscall.h>
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#include <errno.h>
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extern "C" long __do_syscall_ret(unsigned long ret) {
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return ret;
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}
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using sc_word_t = long;
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sc_word_t __do_syscall0(long sc) {
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register long sc_reg asm("rax") = sc;
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register sc_word_t ret asm("rax");
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asm volatile ("syscall" : "=r"(ret) : "r"(sc_reg) : "rcx", "r11", "memory");
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return ret;
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}
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sc_word_t __do_syscall1(long sc, sc_word_t arg1) {
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register long sc_reg asm("rax") = sc;
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register sc_word_t arg1_reg asm("rdi") = arg1;
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register sc_word_t ret asm("rax");
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asm volatile ("syscall" : "=r"(ret) :
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"r"(sc_reg),
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"r"(arg1_reg)
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: "rcx", "r11", "memory");
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return ret;
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}
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sc_word_t __do_syscall2(long sc, sc_word_t arg1, sc_word_t arg2) {
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register long sc_reg asm("rax") = sc;
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register sc_word_t arg1_reg asm("rdi") = arg1;
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register sc_word_t arg2_reg asm("rsi") = arg2;
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register sc_word_t ret asm("rax");
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asm volatile ("syscall" : "=r"(ret) :
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"r"(sc_reg),
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"r"(arg1_reg),
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"r"(arg2_reg)
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: "rcx", "r11", "memory");
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return ret;
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}
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sc_word_t __do_syscall3(long sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3) {
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register long sc_reg asm("rax") = sc;
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register sc_word_t arg1_reg asm("rdi") = arg1;
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register sc_word_t arg2_reg asm("rsi") = arg2;
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register sc_word_t arg3_reg asm("rdx") = arg3;
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register sc_word_t ret asm("rax");
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asm volatile ("syscall" : "=r"(ret) :
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"r"(sc_reg),
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"r"(arg1_reg),
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"r"(arg2_reg),
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"r"(arg3_reg)
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: "rcx", "r11", "memory");
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return ret;
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}
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sc_word_t __do_syscall4(long sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4) {
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register long sc_reg asm("rax") = sc;
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register sc_word_t arg1_reg asm("rdi") = arg1;
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register sc_word_t arg2_reg asm("rsi") = arg2;
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register sc_word_t arg3_reg asm("rdx") = arg3;
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register sc_word_t arg4_reg asm("r10") = arg4; // arg4 must be in r10 on x86_64
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register sc_word_t ret asm("rax");
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asm volatile ("syscall" : "=r"(ret) :
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"r"(sc_reg),
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"r"(arg1_reg),
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"r"(arg2_reg),
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"r"(arg3_reg),
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"r"(arg4_reg)
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: "rcx", "r11", "memory");
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return ret;
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}
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sc_word_t __do_syscall5(long sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4, sc_word_t arg5) {
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register long sc_reg asm("rax") = sc;
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register sc_word_t arg1_reg asm("rdi") = arg1;
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register sc_word_t arg2_reg asm("rsi") = arg2;
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register sc_word_t arg3_reg asm("rdx") = arg3;
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register sc_word_t arg4_reg asm("r10") = arg4;
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register sc_word_t arg5_reg asm("r8") = arg5;
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register sc_word_t ret asm("rax");
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asm volatile ("syscall" : "=r"(ret) :
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"r"(sc_reg),
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"r"(arg1_reg),
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"r"(arg2_reg),
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"r"(arg3_reg),
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"r"(arg4_reg),
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"r"(arg5_reg)
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: "rcx", "r11", "memory");
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return ret;
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}
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sc_word_t __do_syscall6(long sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4, sc_word_t arg5, sc_word_t arg6) {
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register long sc_reg asm("rax") = sc;
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register sc_word_t arg1_reg asm("rdi") = arg1;
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register sc_word_t arg2_reg asm("rsi") = arg2;
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register sc_word_t arg3_reg asm("rdx") = arg3;
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register sc_word_t arg4_reg asm("r10") = arg4;
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register sc_word_t arg5_reg asm("r8") = arg5;
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register sc_word_t arg6_reg asm("r9") = arg6;
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register sc_word_t ret asm("rax");
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asm volatile ("syscall" : "=r"(ret) :
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"r"(sc_reg),
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"r"(arg1_reg),
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"r"(arg2_reg),
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"r"(arg3_reg),
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"r"(arg4_reg),
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"r"(arg5_reg),
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"r"(arg6_reg)
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: "rcx", "r11", "memory");
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return ret;
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}
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/* x86_64 only supports 6 arguments in the syscall ABI. The 7th argument is ignored
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* (no syscall in Linux or your kernel uses 7 scalar arguments). */
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sc_word_t __do_syscall7(long sc,
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sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4, sc_word_t arg5, sc_word_t arg6,
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sc_word_t arg7) {
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(void)arg7;
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return __do_syscall6(sc, arg1, arg2, arg3, arg4, arg5, arg6);
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} |