kaguya
91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
#include <bits/syscall.h>
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#include <sys/syscall.h>
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using sc_word_t = __sc_word_t;
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// Note: ebx is used for PIC (it holds a reference to the GOT), so we can't clobber it with gcc apparently,
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// and also need to make sure to restore it after a syscall
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sc_word_t __do_syscall0(long sc) {
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sc_word_t ret;
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asm volatile("int $0x80" : "=a"(ret) : "a"(sc) : "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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sc_word_t ret;
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asm volatile("xchg %%ebx, %%edi;"
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"int $0x80;"
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"xchg %%edi, %%ebx;"
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: "=a"(ret)
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: "a"(sc), "D"(arg1)
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: "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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sc_word_t ret;
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asm volatile("xchg %%ebx, %%edi;"
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"int $0x80;"
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"xchg %%edi, %%ebx;"
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: "=a"(ret)
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: "a"(sc), "D"(arg1), "c"(arg2)
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: "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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sc_word_t ret;
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asm volatile("xchg %%ebx, %%edi;"
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"int $0x80;"
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"xchg %%edi, %%ebx;"
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: "=a"(ret)
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: "a"(sc), "D"(arg1), "c"(arg2), "d"(arg3)
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: "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, sc_word_t arg4) {
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sc_word_t ret;
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asm volatile("xchg %%ebx, %%edi;"
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"int $0x80;"
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"xchg %%edi, %%ebx;"
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: "=a"(ret)
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: "a"(sc), "D"(arg1), "c"(arg2), "d"(arg3), "S"(arg4)
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: "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, sc_word_t arg4,
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sc_word_t arg5) {
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sc_word_t ret;
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asm volatile("pushl %2;"
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"push %%ebx;"
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"mov 4(%%esp), %%ebx;"
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"int $0x80;"
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"pop %%ebx;"
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"add $4, %%esp;"
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: "=a"(ret)
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: "a"(sc), "g"(arg1), "c"(arg2), "d"(arg3), "S"(arg4), "D"(arg5)
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: "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, sc_word_t arg4,
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sc_word_t arg5, sc_word_t arg6) {
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sc_word_t ret;
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sc_word_t a1a6[2] = { arg1, arg6 };
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asm volatile ("pushl %1;"
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"push %%ebx;"
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"push %%ebp;"
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"mov 8(%%esp),%%ebx;"
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"mov 4(%%ebx),%%ebp;"
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"mov (%%ebx),%%ebx;"
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"int $0x80;"
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"pop %%ebp;"
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"pop %%ebx;"
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"add $4,%%esp;"
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: "=a"(ret) : "g"(&a1a6), "a"(sc), "c"(arg2), "d"(arg3), "S"(arg4), "D"(arg5) : "memory");
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return ret;
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}
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