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Espresso 0.0.1e

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This commit is contained in:
David Goeke
2025-07-04 14:23:29 -05:00
parent dd11e15c3b
commit dbaee2c881
17 changed files with 215 additions and 20 deletions
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81
lib/ksymtab.c
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@ -2,20 +2,12 @@
#include <ksymtab.h>
typedef struct kfunc {
/*
Bit 31 = 1 -> driver/module function, Bit 31 = 0 -> kernel function
Bits 30-20 -> module/driver ID (11 bits)
Bits 19-0 -> function ID (20 bits)
*/
uint32_t id;
uint32_t addr; /* Pointer to function, 0x0 if nonexistent */
} kfunc_t;
#define KFUNC_TABLE_ADDRESS 0xC0101000
#define KFUNC_TABLE_SIZE (2 ^ 31) /* Maybe? who knows? */
#define KSYMTAB_MAX 0x8086FF
#define IS_MODULE_FUNC(id) ((id) & 0x80000000)
#define GET_MODULE_ID(id) (((id) >> 20) & 0x7FF)
@ -26,9 +18,10 @@ typedef struct kfunc {
#define MAKE_MODULE_FUNC(mid, fid) (0x80000000 | ((mid) << 20) | ((fid) & 0xFFFFF))
kfunc_t* kfunc_table = (kfunc_t*)KFUNC_TABLE_ADDRESS;
static uint32_t ktab_size = 0;
uint64_t kfunc_call(kfunc_t* func, uint32_t a, uint32_t b, uint32_t c, uint32_t d)
{
@ -53,7 +46,7 @@ uint64_t kfunc_call(kfunc_t* func, uint32_t a, uint32_t b, uint32_t c, uint32_t
uint64_t call_kfunc_by_id(uint32_t id, uint32_t a, uint32_t b, uint32_t c, uint32_t d)
{
for (int i = 0; i < KFUNC_TABLE_SIZE; i++)
for (int i = 0; i < (int)ktab_size; i++)
{
if (kfunc_table[i].id == id)
{
@ -67,3 +60,65 @@ uint64_t call_kfunc_by_id(uint32_t id, uint32_t a, uint32_t b, uint32_t c, uint3
return -1;
}
uint32_t add_kfunc(void* addr, bool module, uint16_t module_id, uint32_t function_id)
{
if (ktab_size >= KSYMTAB_MAX)
{
return 0xFFFFFFFF;
}
kfunc_t kf = make_kfunc(addr, module, module_id, function_id);
kfunc_table[ktab_size] = kf;
ktab_size++;
return kf.id;
}
/*
Constructs and returns a kfunc_t:
- 'addr' is the address of the function (can be NULL/0)
- 'module' indicates if it's a module/driver function
- 'module_id' is used only if 'module' is true (11 bits max)
- 'function_id':
- 20 bits if module is true
- 31 bits if kernel function
*/
kfunc_t make_kfunc(void* addr, bool module, uint16_t module_id, uint32_t function_id)
{
uint32_t id;
if (module)
{
id = 0x80000000 | ((module_id & 0x7FF) << 20) | (function_id & 0xFFFFF);
}
else
{
if (function_id == UINT32_MAX)
{
function_id = ktab_size;
}
id = function_id & 0x7FFFFFFF;
}
kfunc_t result = {
.id = id,
.addr = (uint32_t)(uintptr_t)addr
};
return result;
}
kfunc_t* find_kfunc(uint32_t id)
{
for (uint32_t i = 0; i < ktab_size; i++)
{
if (kfunc_table[i].id == id)
{
return &kfunc_table[i];
}
}
return NULL;
}