70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
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#include <ksymtab.h>
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typedef struct kfunc {
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/*
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Bit 31 = 1 -> driver/module function, Bit 31 = 0 -> kernel function
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Bits 30-20 -> module/driver ID (11 bits)
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Bits 19-0 -> function ID (20 bits)
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*/
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uint32_t id;
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uint32_t addr; /* Pointer to function, 0x0 if nonexistent */
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} kfunc_t;
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#define KFUNC_TABLE_ADDRESS 0xC0101000
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#define KFUNC_TABLE_SIZE (2 ^ 31) /* Maybe? who knows? */
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#define IS_MODULE_FUNC(id) ((id) & 0x80000000)
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#define GET_MODULE_ID(id) (((id) >> 20) & 0x7FF)
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#define GET_FUNC_ID(id) ((id) & 0xFFFFF)
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#define EXISTS(id) ((id) > 0x0)
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#define MAKE_KERNEL_FUNC(id) ((id) & 0x7FFFFFFF)
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#define MAKE_MODULE_FUNC(mid, fid) (0x80000000 | ((mid) << 20) | ((fid) & 0xFFFFF))
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kfunc_t* kfunc_table = (kfunc_t*)KFUNC_TABLE_ADDRESS;
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uint64_t kfunc_call(kfunc_t* func, uint32_t a, uint32_t b, uint32_t c, uint32_t d)
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{
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uint32_t eax_ret, edx_ret;
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asm volatile (
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"push %[d]\n\t"
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"push %[c]\n\t"
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"push %[b]\n\t"
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"push %[a]\n\t"
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"call *%[fn]\n\t"
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"add $16, %%esp\n\t" /* clean up stack (4 args * 4 bytes) */
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: "=a"(eax_ret), "=d"(edx_ret)
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: [a]"r"(a), [b]"r"(b), [c]"r"(c), [d]"r"(d), [fn]"r"(func->addr)
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: "memory"
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);
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return ((uint64_t)edx_ret << 32) | eax_ret;
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}
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uint64_t call_kfunc_by_id(uint32_t id, uint32_t a, uint32_t b, uint32_t c, uint32_t d)
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{
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for (int i = 0; i < KFUNC_TABLE_SIZE; i++)
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{
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if (kfunc_table[i].id == id)
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{
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if (kfunc_table[i].addr == 0x0)
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{
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return -1;
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}
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return kfunc_call(&kfunc_table[i], a, b, c, d);
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}
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}
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return -1;
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}
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