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move GNU and ELF specific struct readers to appropriate layers

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This commit is contained in:
Nikita Smith
2025-12-28 01:16:55 -08:00
parent f150662cc4
commit fd6c3ef0e0
6 changed files with 466 additions and 507 deletions
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src/demon/linux/demon_core_linux.c
+281 -463
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@@ -120,7 +120,8 @@ dmn_lnx_read_string(Arena *arena, int memory_fd, U64 vaddr)
internal internal
MACHINE_OP_MEM_READ(dmn_lnx_machine_op_mem_read) MACHINE_OP_MEM_READ(dmn_lnx_machine_op_mem_read)
{ {
return dmn_lnx_read(((DMN_LNX_Entity *)ud)->fd, r1u64(addr, addr + buffer_size), buffer); U64 read_size = dmn_lnx_read(*(int *)ud, r1u64(addr, addr + buffer_size), buffer);
return read_size == buffer_size ? MachineOpResult_Ok : MachineOpResult_Fail;
} }
internal int internal int
@@ -134,192 +135,6 @@ dmn_lnx_ptrace_seize(pid_t pid)
return OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_SEIZE, pid, 0, PTRACE_O_TRACEEXEC | PTRACE_O_EXITKILL | PTRACE_O_TRACEFORK | PTRACE_O_TRACECLONE)); return OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_SEIZE, pid, 0, PTRACE_O_TRACEEXEC | PTRACE_O_EXITKILL | PTRACE_O_TRACEFORK | PTRACE_O_TRACECLONE));
} }
////////////////////////////////
//~ Runtime Struct Helpers
internal B32
dmn_lnx_read_ehdr(int memory_fd, U64 addr, ELF_Hdr64 *ehdr_out)
{
B32 is_read = 0;
U8 e_ident[ELF_Identifier_Max] = {0};
U64 e_ident_size = dmn_lnx_read(memory_fd, r1u64(addr, addr + sizeof(e_ident)), &e_ident);
if(e_ident_size == sizeof(e_ident))
{
if(str8_match(str8_prefix(str8_array_fixed(e_ident), elf_magic_string.size), elf_magic_string, 0))
{
switch(e_ident[ELF_Identifier_Class])
{
default:{InvalidPath;}break;
case ELF_Class_None: {}break;
case ELF_Class_32:
{
ELF_Hdr32 ehdr32 = {0};
if(dmn_lnx_read_struct(memory_fd, addr, &ehdr32))
{
*ehdr_out = elf_hdr64_from_hdr32(ehdr32);
is_read = 1;
}
}break;
case ELF_Class_64:
{
is_read = dmn_lnx_read_struct(memory_fd, addr, ehdr_out);
}break;
}
}
}
return is_read;
}
internal B32
dmn_lnx_read_phdr(int memory_fd, U64 addr, ELF_Class elf_class, ELF_Phdr64 *phdr_out)
{
B32 is_read = 0;
switch (elf_class)
{
case ELF_Class_None: break;
case ELF_Class_32:
{
ELF_Phdr32 phdr32 = {0};
if(dmn_lnx_read_struct(memory_fd, addr, &phdr32))
{
*phdr_out = elf_phdr64_from_phdr32(phdr32);
is_read = 1;
}
}break;
case ELF_Class_64:
{
is_read = dmn_lnx_read_struct(memory_fd, addr, phdr_out);
}break;
default:{NotImplemented;}break;
}
return is_read;
}
internal B32
dmn_lnx_read_shdr(int memory_fd, U64 addr, ELF_Class elf_class, ELF_Shdr64 *shdr_out)
{
B32 is_read = 0;
switch (elf_class)
{
case ELF_Class_None: break;
case ELF_Class_32:
{
ELF_Shdr32 shdr32 = {0};
if(dmn_lnx_read_struct(memory_fd, addr, &shdr32))
{
*shdr_out = elf_shdr64_from_shdr32(shdr32);
is_read = 1;
}
}break;
case ELF_Class_64:
{
is_read = dmn_lnx_read_struct(memory_fd, addr, shdr_out);
}break;
default:{NotImplemented;}break;
}
return is_read;
}
internal B32
dmn_lnx_read_linkmap(int memory_fd, U64 addr, ELF_Class elf_class, GNU_LinkMap64 *linkmap_out)
{
B32 is_read = 0;
switch(elf_class)
{
case ELF_Class_None: {}break;
case ELF_Class_32:
{
GNU_LinkMap32 linkmap32 = {0};
if(dmn_lnx_read_struct(memory_fd, addr, &linkmap32))
{
*linkmap_out = gnu_linkmap64_from_linkmap32(linkmap32);
is_read = 1;
}
}break;
case ELF_Class_64:
{
is_read = dmn_lnx_read_struct(memory_fd, addr, linkmap_out);
}break;
default:{NotImplemented;}break;
}
return is_read;
}
internal B32
dmn_lnx_read_dynamic(int memory_fd, U64 addr, ELF_Class elf_class, ELF_Dyn64 *dyn_out)
{
B32 is_read = 0;
switch(elf_class)
{
case ELF_Class_None:{}break;
case ELF_Class_32:
{
ELF_Dyn32 dyn32 = {0};
if(dmn_lnx_read_struct(memory_fd, addr, &dyn32))
{
*dyn_out = elf_dyn64_from_dyn32(dyn32);
is_read = 1;
}
}break;
case ELF_Class_64:
{
is_read = dmn_lnx_read_struct(memory_fd, addr, dyn_out);
}break;
default:{NotImplemented;}break;
}
return is_read;
}
internal B32
dmn_lnx_read_symbol(int memory_fd, U64 addr, ELF_Class elf_class, ELF_Sym64 *symbol_out)
{
B32 is_read = 0;
switch(elf_class)
{
case ELF_Class_None:{}break;
case ELF_Class_32:
{
ELF_Sym32 symbol32 = {0};
if(dmn_lnx_read_struct(memory_fd, addr, &symbol32))
{
*symbol_out = elf_sym64_from_sym32(symbol32);
is_read = 1;
}
}break;
case ELF_Class_64:
{
is_read = dmn_lnx_read_struct(memory_fd, addr, symbol_out);
}break;
default:{NotImplemented;}break;
}
return is_read;
}
internal B32
dmn_lnx_read_r_debug(int memory_fd, U64 addr, Arch arch, GNU_RDebugInfo64 *rdebug_out)
{
B32 is_read = 0;
switch(gnu_rdebug_info_size_from_arch(arch))
{
case 0: {} break;
case sizeof(GNU_RDebugInfo32): {
GNU_RDebugInfo32 rdebug32 = {0};
if(dmn_lnx_read_struct(memory_fd, addr, &rdebug32))
{
*rdebug_out = gnu_rdebug_info64_from_rdebug_info32(rdebug32);
is_read = 1;
}
}break;
case sizeof(GNU_RDebugInfo64):
{
is_read = dmn_lnx_read_struct(memory_fd, addr, rdebug_out);
}break;
default:{InvalidPath;}break;
}
Assert(is_read);
return is_read;
}
//- rjf: pid => info extraction //- rjf: pid => info extraction
internal String8 internal String8
@@ -353,260 +168,6 @@ dmn_lnx_exe_path_from_pid(Arena *arena, pid_t pid)
return result; return result;
} }
internal ELF_Hdr64
dmn_lnx_ehdr_from_pid(pid_t pid)
{
Temp scratch = scratch_begin(0, 0);
B32 is_read = 0;
ELF_Hdr64 exe = {0};
String8 exe_path = dmn_lnx_exe_path_from_pid(scratch.arena, pid);
if(exe_path.size != 0)
{
int exe_fd = OS_LNX_RETRY_ON_EINTR(open((char *)exe_path.str, O_RDONLY));
if(exe_fd != -1)
{
is_read = dmn_lnx_read_ehdr(exe_fd, 0, &exe);
close(exe_fd);
}
}
Assert(is_read);
scratch_end(scratch);
return exe;
}
internal DMN_LNX_ProcessAuxv
dmn_lnx_auxv_from_pid(pid_t pid, ELF_Class elf_class)
{
Temp scratch = scratch_begin(0, 0);
DMN_LNX_ProcessAuxv result = {0};
// rjf: open aux data
String8 auxv_path = push_str8f(scratch.arena, "/proc/%d/auxv", pid);
int auxv_fd = OS_LNX_RETRY_ON_EINTR(open((char*)auxv_path.str, O_RDONLY));
// rjf: scan aux data
if(auxv_fd >= 0)
{
for(;;)
{
// rjf: read next aux
ELF_Auxv64 auxv = {0};
switch(elf_class)
{
case ELF_Class_None:{}break;
case ELF_Class_32:
{
ELF_Auxv32 auxv32 = {0};
if(read(auxv_fd, &auxv32, sizeof(auxv32)) != sizeof(auxv32)) { goto brkloop; }
auxv = elf_auxv64_from_auxv32(auxv32);
}break;
case ELF_Class_64:
{
if(read(auxv_fd, &auxv, sizeof(auxv)) != sizeof(auxv)) { goto brkloop; }
}break;
default:{NotImplemented;}break;
}
// rjf: fill result
switch(auxv.a_type)
{
default:{}break;
case ELF_AuxType_Null: goto brkloop; break;
case ELF_AuxType_Base: result.base = auxv.a_val; break;
case ELF_AuxType_Phnum: result.phnum = auxv.a_val; break;
case ELF_AuxType_Phent: result.phent = auxv.a_val; break;
case ELF_AuxType_Phdr: result.phdr = auxv.a_val; break;
case ELF_AuxType_ExecFn: result.execfn = auxv.a_val; break;
case ELF_AuxType_Pagesz: result.pagesz = auxv.a_val; break;
}
}
brkloop:;
close(auxv_fd);
}
scratch_end(scratch);
return result;
}
internal DMN_LNX_PhdrInfo
dmn_lnx_phdr_info_from_memory(int memory_fd, ELF_Class elf_class, U64 rebase, U64 e_phaddr, U64 e_phentsize, U64 e_phnum)
{
DMN_LNX_PhdrInfo result = { .range.min = max_U64 };
// rjf: scan table
for(U64 ph_cursor = e_phaddr, ph_opl = (e_phaddr + e_phentsize * e_phnum);
ph_cursor < ph_opl;
ph_cursor += e_phentsize)
{
ELF_Phdr64 phdr = {0};
if(!dmn_lnx_read_phdr(memory_fd, ph_cursor, elf_class, &phdr))
{
Assert(0 && "unable to read a program header");
}
// rjf: save
switch(phdr.p_type)
{
default:{}break;
case ELF_PType_Dynamic:
{
result.dynamic = rebase + phdr.p_vaddr;
}break;
case ELF_PType_Load:
{
U64 min = rebase + phdr.p_vaddr;
U64 max = rebase + phdr.p_vaddr + phdr.p_memsz;
result.range.min = Min(result.range.min, min);
result.range.max = Max(result.range.max, max);
}break;
}
}
return result;
}
internal DMN_LNX_DynamicInfo
dmn_lnx_dynamic_info_from_memory(int memory_fd, ELF_Class elf_class, U64 rebase, U64 dynamic_vaddr)
{
DMN_LNX_DynamicInfo dynamic_info = {0};
for(U64 dynamic_cursor = dynamic_vaddr; ; dynamic_cursor += elf_dyn_size_from_class(elf_class))
{
// rjf: read next dyn entry
ELF_Dyn64 dyn = {0};
if(!dmn_lnx_read_dynamic(memory_fd, dynamic_cursor, elf_class, &dyn)) { Assert(0 && "unable to read dynamic"); }
// rjf: break on zero
if(dyn.tag == ELF_DynTag_Null) { break; }
// extract reuiqred values out of dynamic section
if(dyn.tag == ELF_DynTag_Strtab)
{
dynamic_info.strtab_vaddr = rebase + dyn.val;
}
else if(dyn.tag == ELF_DynTag_Strsz)
{
dynamic_info.strtab_size = dyn.val;
}
else if(dyn.tag == ELF_DynTag_Symtab)
{
dynamic_info.symtab_vaddr = rebase + dyn.val;
}
else if(dyn.tag == ELF_DynTag_Syment)
{
dynamic_info.symtab_entry_size = dyn.val;
}
else if(dyn.tag == ELF_DynTag_Hash)
{
dynamic_info.hash_vaddr = rebase + dyn.val;
}
else if(dyn.tag == ELF_DynTag_GNU_Hash)
{
dynamic_info.gnu_hash_vaddr = rebase + dyn.val;
}
}
return dynamic_info;
}
internal U64
dmn_lnx_rdebug_vaddr_from_memory(int memory_fd, U64 loader_vbase, B32 is_rebased)
{
Temp scratch = scratch_begin(0, 0);
U64 rdebug_vaddr = 0;
// load DL's header
ELF_Hdr64 ehdr = {0};
if(!dmn_lnx_read_ehdr(memory_fd, loader_vbase, &ehdr)) { Assert(0 && "failed to read interp's header"); goto exit; }
U64 rebase = ehdr.e_type == ELF_Type_Dyn ? loader_vbase : 0;
ELF_Class elf_class = ehdr.e_ident[ELF_Identifier_Class];
// find dynamic program header
U64 dynamic_vaddr = max_U64;
for EachIndex(phdr_idx, ehdr.e_phnum)
{
U64 phdr_vaddr = loader_vbase + ehdr.e_phoff + phdr_idx * ehdr.e_phentsize;
ELF_Phdr64 phdr = {0};
if(!dmn_lnx_read_phdr(memory_fd, phdr_vaddr, elf_class, &phdr)) { Assert(0 && "failed to read program header"); goto exit; }
if(phdr.p_type == ELF_PType_Dynamic)
{
dynamic_vaddr = rebase + phdr.p_vaddr;
break;
}
}
// extract necessary info out of dynamic program header
U64 dynamic_info_rebase = is_rebased ? 0 : rebase;
DMN_LNX_DynamicInfo dynamic_info = dmn_lnx_dynamic_info_from_memory(memory_fd, elf_class, dynamic_info_rebase, dynamic_vaddr);
// extract symbol table count from available options
U64 symbol_count = 0;
if(dynamic_info.hash_vaddr)
{
U64 hash_entry_size = 4;
if(elf_class == ELF_Class_64 && (ehdr.e_machine == ELF_MachineKind_ALPHA || ehdr.e_machine == ELF_MachineKind_S390 || ehdr.e_machine == ELF_MachineKind_S390_OLD))
{
hash_entry_size = 8;
}
U64 chain_count = 0;
if(dmn_lnx_read(memory_fd, r1u64(dynamic_info.hash_vaddr, dynamic_info.hash_vaddr + hash_entry_size), &chain_count) == hash_entry_size)
{
symbol_count = chain_count;
}
else
{
Assert(0 && "failed to read hash table's chain count out of HASH");
}
}
else
{
// TODO: extract count from GNU_HASH
NotImplemented;
}
// scan symbol table for the rendezvous symbol
if(dynamic_info.symtab_vaddr && dynamic_info.symtab_entry_size && symbol_count)
{
for EachIndex(symbol_idx, symbol_count)
{
ELF_Sym64 symbol = {0};
if(!dmn_lnx_read_symbol(memory_fd, dynamic_info.symtab_vaddr + symbol_idx * dynamic_info.symtab_entry_size, elf_class, &symbol))
{
Assert(0 && "failed to read symbol table");
break;
}
Temp temp = temp_begin(scratch.arena);
String8 symbol_name = {0};
if(symbol.st_name < dynamic_info.strtab_size)
{
U64 cap = dynamic_info.strtab_size - symbol.st_name;
symbol_name = dmn_lnx_read_string_capped(temp.arena, memory_fd, dynamic_info.strtab_vaddr + symbol.st_name, cap);
}
if(str8_match(symbol_name, str8_lit("_r_debug"), 0))
{
ELF_SymType symbol_type = ELF_ST_TYPE(symbol.st_info);
if(symbol_type == ELF_SymType_Object && symbol.st_size > 0)
{
rdebug_vaddr = rebase + symbol.st_value;
break;
}
}
temp_end(temp);
}
}
exit:;
scratch_end(scratch);
return rdebug_vaddr;
}
internal String8 internal String8
dmn_lnx_dl_path_from_pid(Arena *arena, pid_t pid, U64 auxv_base) dmn_lnx_dl_path_from_pid(Arena *arena, pid_t pid, U64 auxv_base)
{ {
@@ -679,6 +240,259 @@ dmn_lnx_dl_path_from_pid(Arena *arena, pid_t pid, U64 auxv_base)
return dl_path; return dl_path;
} }
internal ELF_Hdr64
dmn_lnx_ehdr_from_pid(pid_t pid)
{
Temp scratch = scratch_begin(0, 0);
B32 is_read = 0;
ELF_Hdr64 exe = {0};
String8 exe_path = dmn_lnx_exe_path_from_pid(scratch.arena, pid);
if(exe_path.size != 0)
{
int exe_fd = OS_LNX_RETRY_ON_EINTR(open((char *)exe_path.str, O_RDONLY));
if(exe_fd != -1)
{
is_read = elf_read_ehdr(dmn_lnx_machine_op_mem_read, &exe_fd, 0, &exe);
close(exe_fd);
}
}
Assert(is_read);
scratch_end(scratch);
return exe;
}
internal DMN_LNX_ProcessAuxv
dmn_lnx_auxv_from_pid(pid_t pid, ELF_Class elf_class)
{
Temp scratch = scratch_begin(0, 0);
DMN_LNX_ProcessAuxv result = {0};
// rjf: open aux data
String8 auxv_path = push_str8f(scratch.arena, "/proc/%d/auxv", pid);
int auxv_fd = OS_LNX_RETRY_ON_EINTR(open((char*)auxv_path.str, O_RDONLY));
// rjf: scan aux data
if(auxv_fd >= 0)
{
for(;;)
{
// rjf: read next aux
ELF_Auxv64 auxv = {0};
switch(elf_class)
{
case ELF_Class_None:{}break;
case ELF_Class_32:
{
ELF_Auxv32 auxv32 = {0};
if(read(auxv_fd, &auxv32, sizeof(auxv32)) != sizeof(auxv32)) { goto brkloop; }
auxv = elf_auxv64_from_auxv32(auxv32);
}break;
case ELF_Class_64:
{
if(read(auxv_fd, &auxv, sizeof(auxv)) != sizeof(auxv)) { goto brkloop; }
}break;
default:{NotImplemented;}break;
}
// rjf: fill result
switch(auxv.a_type)
{
default:{}break;
case ELF_AuxType_Null: goto brkloop; break;
case ELF_AuxType_Base: result.base = auxv.a_val; break;
case ELF_AuxType_Phnum: result.phnum = auxv.a_val; break;
case ELF_AuxType_Phent: result.phent = auxv.a_val; break;
case ELF_AuxType_Phdr: result.phdr = auxv.a_val; break;
case ELF_AuxType_ExecFn: result.execfn = auxv.a_val; break;
case ELF_AuxType_Pagesz: result.pagesz = auxv.a_val; break;
}
}
brkloop:;
close(auxv_fd);
}
scratch_end(scratch);
return result;
}
internal Rng1U64
dmn_lnx_compute_image_vrange(int memory_fd, ELF_Class elf_class, U64 rebase, U64 e_phaddr, U64 e_phentsize, U64 e_phnum)
{
Rng1U64 result = { .min = max_U64 };
for(U64 ph_cursor = e_phaddr, ph_opl = (e_phaddr + e_phentsize * e_phnum); ph_cursor < ph_opl; ph_cursor += e_phentsize)
{
ELF_Phdr64 phdr = {0};
if(elf_read_phdr(dmn_lnx_machine_op_mem_read, &memory_fd, ph_cursor, elf_class, &phdr) != MachineOpResult_Ok)
{
Assert(0 && "unable to read a program header");
}
if(phdr.p_type == ELF_PType_Load)
{
U64 min = rebase + phdr.p_vaddr;
U64 max = rebase + phdr.p_vaddr + phdr.p_memsz;
result.min = Min(result.min, min);
result.max = Max(result.max, max);
}
}
return result;
}
internal U64
dmn_lnx_find_dynamic_phdr(int memory_fd, ELF_Class elf_class, U64 rebase, U64 e_phaddr, U64 e_phentsize, U64 e_phnum)
{
U64 result = max_U64;
for(U64 ph_cursor = e_phaddr, ph_opl = (e_phaddr + e_phentsize * e_phnum); ph_cursor < ph_opl; ph_cursor += e_phentsize)
{
ELF_Phdr64 phdr = {0};
if(elf_read_phdr(dmn_lnx_machine_op_mem_read, &memory_fd, ph_cursor, elf_class, &phdr) != MachineOpResult_Ok)
{
Assert(0 && "unable to read a program header");
}
if(phdr.p_type == ELF_PType_Dynamic)
{
result = rebase + phdr.p_vaddr;
break;
}
}
return result;
}
internal DMN_LNX_DynamicInfo
dmn_lnx_dynamic_info_from_memory(int memory_fd, ELF_Class elf_class, U64 rebase, U64 dynamic_vaddr)
{
DMN_LNX_DynamicInfo dynamic_info = {0};
for(U64 dynamic_cursor = dynamic_vaddr; ; dynamic_cursor += elf_dyn_size_from_class(elf_class))
{
// rjf: read next dyn entry
ELF_Dyn64 dyn = {0};
if(elf_read_dyn(dmn_lnx_machine_op_mem_read, &memory_fd, dynamic_cursor, elf_class, &dyn) != MachineOpResult_Ok) { Assert(0 && "unable to read dynamic"); }
// rjf: break on zero
if(dyn.tag == ELF_DynTag_Null) { break; }
// extract reuiqred values out of dynamic section
if(dyn.tag == ELF_DynTag_Strtab)
{
dynamic_info.strtab_vaddr = rebase + dyn.val;
}
else if(dyn.tag == ELF_DynTag_Strsz)
{
dynamic_info.strtab_size = dyn.val;
}
else if(dyn.tag == ELF_DynTag_Symtab)
{
dynamic_info.symtab_vaddr = rebase + dyn.val;
}
else if(dyn.tag == ELF_DynTag_Syment)
{
dynamic_info.symtab_entry_size = dyn.val;
}
else if(dyn.tag == ELF_DynTag_Hash)
{
dynamic_info.hash_vaddr = rebase + dyn.val;
}
else if(dyn.tag == ELF_DynTag_GNU_Hash)
{
dynamic_info.gnu_hash_vaddr = rebase + dyn.val;
}
}
return dynamic_info;
}
internal U64
dmn_lnx_rdebug_vaddr_from_memory(int memory_fd, U64 loader_vbase, B32 is_rebased)
{
Temp scratch = scratch_begin(0, 0);
U64 rdebug_vaddr = 0;
// load DL's header
ELF_Hdr64 ehdr = {0};
if(elf_read_ehdr(dmn_lnx_machine_op_mem_read, &memory_fd, loader_vbase, &ehdr) != MachineOpResult_Ok) { Assert(0 && "failed to read interp's header"); goto exit; }
U64 rebase = ehdr.e_type == ELF_Type_Dyn ? loader_vbase : 0;
ELF_Class elf_class = ehdr.e_ident[ELF_Identifier_Class];
// find dynamic program header
U64 phdr_vaddr = loader_vbase + ehdr.e_phoff;
U64 dynamic_vaddr = dmn_lnx_find_dynamic_phdr(memory_fd, elf_class, rebase, phdr_vaddr, ehdr.e_phentsize, ehdr.e_phentsize);
// extract necessary info out of dynamic program header
U64 dynamic_info_rebase = is_rebased ? 0 : rebase;
DMN_LNX_DynamicInfo dynamic_info = dmn_lnx_dynamic_info_from_memory(memory_fd, elf_class, dynamic_info_rebase, dynamic_vaddr);
// extract symbol table count from available options
U64 symbol_count = 0;
if(dynamic_info.hash_vaddr)
{
U64 hash_entry_size = 4;
if(elf_class == ELF_Class_64 && (ehdr.e_machine == ELF_MachineKind_ALPHA || ehdr.e_machine == ELF_MachineKind_S390 || ehdr.e_machine == ELF_MachineKind_S390_OLD))
{
hash_entry_size = 8;
}
U64 chain_count = 0;
if(dmn_lnx_read(memory_fd, r1u64(dynamic_info.hash_vaddr, dynamic_info.hash_vaddr + hash_entry_size), &chain_count) == hash_entry_size)
{
symbol_count = chain_count;
}
else
{
Assert(0 && "failed to read hash table's chain count out of HASH");
}
}
else
{
// TODO: extract count from GNU_HASH
NotImplemented;
}
// scan symbol table for the rendezvous symbol
if(dynamic_info.symtab_vaddr && dynamic_info.symtab_entry_size && symbol_count)
{
for EachIndex(symbol_idx, symbol_count)
{
ELF_Sym64 symbol = {0};
if(elf_read_symbol(dmn_lnx_machine_op_mem_read, &memory_fd, dynamic_info.symtab_vaddr + symbol_idx * dynamic_info.symtab_entry_size, elf_class, &symbol) != MachineOpResult_Ok)
{
Assert(0 && "failed to read symbol table");
break;
}
Temp temp = temp_begin(scratch.arena);
String8 symbol_name = {0};
if(symbol.st_name < dynamic_info.strtab_size)
{
U64 cap = dynamic_info.strtab_size - symbol.st_name;
symbol_name = dmn_lnx_read_string_capped(temp.arena, memory_fd, dynamic_info.strtab_vaddr + symbol.st_name, cap);
}
if(str8_match(symbol_name, str8_lit("_r_debug"), 0))
{
ELF_SymType symbol_type = ELF_ST_TYPE(symbol.st_info);
if(symbol_type == ELF_SymType_Object && symbol.st_size > 0)
{
rdebug_vaddr = rebase + symbol.st_value;
break;
}
}
temp_end(temp);
}
}
exit:;
scratch_end(scratch);
return rdebug_vaddr;
}
//////////////////////////////// ////////////////////////////////
//~ SDT Probes //~ SDT Probes
@@ -690,11 +504,11 @@ dmn_lnx_read_probes(Arena *arena, int fd, U64 offset, U64 image_base)
DMN_LNX_ProbeList probes = {0}; DMN_LNX_ProbeList probes = {0};
ELF_Hdr64 ehdr = {0}; ELF_Hdr64 ehdr = {0};
if(!dmn_lnx_read_ehdr(fd, offset, &ehdr)) { goto exit; } if(elf_read_ehdr(dmn_lnx_machine_op_mem_read, &fd, offset, &ehdr) != MachineOpResult_Ok) { goto exit; }
U64 strtab_shdr_offset = offset + ehdr.e_shoff + ehdr.e_shstrndx * ehdr.e_shentsize; U64 strtab_shdr_offset = offset + ehdr.e_shoff + ehdr.e_shstrndx * ehdr.e_shentsize;
ELF_Shdr64 strtab_shdr = {0}; ELF_Shdr64 strtab_shdr = {0};
if(!dmn_lnx_read_shdr(fd, strtab_shdr_offset, ehdr.e_ident[ELF_Identifier_Class], &strtab_shdr)) { goto exit; } if(elf_read_shdr(dmn_lnx_machine_op_mem_read, &fd, strtab_shdr_offset, ehdr.e_ident[ELF_Identifier_Class], &strtab_shdr) != MachineOpResult_Ok) { goto exit; }
B32 found_probes = 0; B32 found_probes = 0;
B32 found_probes_base = 0; B32 found_probes_base = 0;
@@ -705,7 +519,7 @@ dmn_lnx_read_probes(Arena *arena, int fd, U64 offset, U64 image_base)
shdr_off < shdr_opl; shdr_off < shdr_opl;
shdr_off += ehdr.e_shentsize) { shdr_off += ehdr.e_shentsize) {
ELF_Shdr64 shdr = {0}; ELF_Shdr64 shdr = {0};
if(!dmn_lnx_read_shdr(fd, shdr_off, ehdr.e_ident[ELF_Identifier_Class], &shdr)) { goto exit; } if(elf_read_shdr(dmn_lnx_machine_op_mem_read, &fd, shdr_off, ehdr.e_ident[ELF_Identifier_Class], &shdr) != MachineOpResult_Ok) { goto exit; }
if(shdr.sh_type == ELF_ShType_Note) if(shdr.sh_type == ELF_ShType_Note)
{ {
@@ -956,6 +770,7 @@ internal B32
dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread) dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread)
{ {
AssertAlways(dmn_lnx_state->tracer_tid == gettid()); AssertAlways(dmn_lnx_state->tracer_tid == gettid());
AssertAlways(thread->thread_state == DMN_LNX_ThreadState_Stopped);
B32 result = 0; B32 result = 0;
switch(thread->arch) switch(thread->arch)
@@ -1178,6 +993,7 @@ internal B32
dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread) dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread)
{ {
AssertAlways(dmn_lnx_state->tracer_tid == thread->parent->tracer_tid); AssertAlways(dmn_lnx_state->tracer_tid == thread->parent->tracer_tid);
AssertAlways(thread->thread_state == DMN_LNX_ThreadState_Stopped);
B32 result = 0; B32 result = 0;
switch(thread->arch) switch(thread->arch)
@@ -1486,13 +1302,13 @@ dmn_lnx_handle_create_process(Arena *arena, DMN_EventList *events, B32 debug_sub
U64 rdebug_brk_vaddr = rdebug_vaddr + gnu_r_brk_offset_from_arch(arch); U64 rdebug_brk_vaddr = rdebug_vaddr + gnu_r_brk_offset_from_arch(arch);
U64 base_vaddr = (auxv.phdr & ~(auxv.pagesz-1)); U64 base_vaddr = (auxv.phdr & ~(auxv.pagesz-1));
U64 rebase = exe_ehdr.e_type == ELF_Type_Dyn ? base_vaddr : 0; U64 rebase = exe_ehdr.e_type == ELF_Type_Dyn ? base_vaddr : 0;
DMN_LNX_PhdrInfo phdr_info = dmn_lnx_phdr_info_from_memory(memory_fd, exe_ehdr.e_ident[ELF_Identifier_Class], rebase, auxv.phdr, auxv.phent, auxv.phnum); Rng1U64 image_vrange = dmn_lnx_compute_image_vrange(memory_fd, exe_ehdr.e_ident[ELF_Identifier_Class], rebase, auxv.phdr, auxv.phent, auxv.phnum);
Arena *process_arena = arena_alloc(); Arena *process_arena = arena_alloc();
ELF_Class dl_class; ELF_Class dl_class;
{ {
ELF_Hdr64 ehdr = {0}; ELF_Hdr64 ehdr = {0};
if(!dmn_lnx_read_ehdr(memory_fd, auxv.base, &ehdr)) { Assert(0 && "failed to read interp's header"); } if(elf_read_ehdr(dmn_lnx_machine_op_mem_read, &memory_fd, auxv.base, &ehdr) != MachineOpResult_Ok) { Assert(0 && "failed to read interp's header"); }
dl_class = ehdr.e_ident[ELF_Identifier_Class]; dl_class = ehdr.e_ident[ELF_Identifier_Class];
} }
@@ -1618,7 +1434,7 @@ dmn_lnx_handle_create_process(Arena *arena, DMN_EventList *events, B32 debug_sub
e->module = dmn_lnx_handle_from_entity(module); e->module = dmn_lnx_handle_from_entity(module);
e->arch = process->arch; e->arch = process->arch;
e->address = base_vaddr; e->address = base_vaddr;
e->size = dim_1u64(phdr_info.range); e->size = dim_1u64(image_vrange);
e->string = dmn_lnx_read_string(arena, process->fd, auxv.execfn); e->string = dmn_lnx_read_string(arena, process->fd, auxv.execfn);
e->elf_phdr_vrange = r1u64(auxv.phdr, auxv.phdr + auxv.phent * auxv.phnum); e->elf_phdr_vrange = r1u64(auxv.phdr, auxv.phdr + auxv.phent * auxv.phnum);
e->elf_phdr_entsize = auxv.phent; e->elf_phdr_entsize = auxv.phent;
@@ -1721,12 +1537,12 @@ dmn_lnx_load_module(Arena *arena, DMN_EventList *events, DMN_LNX_Entity *process
// parse out module's ELF header // parse out module's ELF header
ELF_Hdr64 module_ehdr = {0}; ELF_Hdr64 module_ehdr = {0};
if(!dmn_lnx_read_ehdr(process->fd, base_vaddr, &module_ehdr)) { goto exit; } if(elf_read_ehdr(dmn_lnx_machine_op_mem_read, &process->fd, base_vaddr, &module_ehdr) != MachineOpResult_Ok) { goto exit; }
// gather info about module // gather info about module
U64 module_rebase = module_ehdr.e_type == ELF_Type_Dyn ? base_vaddr : 0; U64 module_rebase = module_ehdr.e_type == ELF_Type_Dyn ? base_vaddr : 0;
U64 module_phdr_vaddr = module_rebase + module_ehdr.e_phoff; U64 module_phdr_vaddr = module_rebase + module_ehdr.e_phoff;
DMN_LNX_PhdrInfo module_phdr_info = dmn_lnx_phdr_info_from_memory(process->fd, module_ehdr.e_ident[ELF_Identifier_Class], module_rebase, module_phdr_vaddr, module_ehdr.e_phentsize, module_ehdr.e_phnum); Rng1U64 module_vrange = dmn_lnx_compute_image_vrange(process->fd, module_ehdr.e_ident[ELF_Identifier_Class], module_rebase, module_phdr_vaddr, module_ehdr.e_phentsize, module_ehdr.e_phnum);
String8 module_name = dmn_lnx_read_string(process->arena, process->fd, module_name_vaddr); String8 module_name = dmn_lnx_read_string(process->arena, process->fd, module_name_vaddr);
// read TLS index and TLS offset // read TLS index and TLS offset
@@ -1757,7 +1573,7 @@ dmn_lnx_load_module(Arena *arena, DMN_EventList *events, DMN_LNX_Entity *process
e->module = dmn_lnx_handle_from_entity(module); e->module = dmn_lnx_handle_from_entity(module);
e->arch = arch_from_elf_machine(module_ehdr.e_machine); e->arch = arch_from_elf_machine(module_ehdr.e_machine);
e->address = base_vaddr; e->address = base_vaddr;
e->size = dim_1u64(module_phdr_info.range); e->size = dim_1u64(module_vrange);
e->string = module_name; e->string = module_name;
e->elf_phdr_vrange = r1u64(module_phdr_vaddr, module_phdr_vaddr + module_ehdr.e_phentsize * module_ehdr.e_phnum); e->elf_phdr_vrange = r1u64(module_phdr_vaddr, module_phdr_vaddr + module_ehdr.e_phentsize * module_ehdr.e_phnum);
e->elf_phdr_entsize = module_ehdr.e_phentsize; e->elf_phdr_entsize = module_ehdr.e_phentsize;
@@ -1775,7 +1591,7 @@ dmn_lnx_handle_load_module(Arena *arena, DMN_EventList *events, DMN_LNX_Entity *
for(U64 map_vaddr = new_link_map_vaddr; map_vaddr != 0; map_vaddr = map.next_vaddr) for(U64 map_vaddr = new_link_map_vaddr; map_vaddr != 0; map_vaddr = map.next_vaddr)
{ {
// read out new link map item // read out new link map item
if(!dmn_lnx_read_linkmap(process->fd, map_vaddr, process->dl_class, &map)) { break; } if(gnu_read_link_map(dmn_lnx_machine_op_mem_read, &process->fd, map_vaddr, process->dl_class, &map) != MachineOpResult_Ok) { break; }
// was module with this base already registered? // was module with this base already registered?
DMN_LNX_Entity *module = hash_table_search_u64_raw(process->loaded_modules_ht, map.addr_vaddr); DMN_LNX_Entity *module = hash_table_search_u64_raw(process->loaded_modules_ht, map.addr_vaddr);
@@ -1804,9 +1620,9 @@ dmn_lnx_handle_unload_module(Arena *arena, DMN_EventList *events, DMN_LNX_Entity
// mark live modules // mark live modules
B32 is_64bit = process->dl_class == ELF_Class_64; B32 is_64bit = process->dl_class == ELF_Class_64;
GNU_RDebugInfoList rdebug_list = gnu_parse_rdebug(scratch.arena, is_64bit, rdebug_vaddr, dmn_lnx_machine_op_mem_read, process); GNU_RDebugInfoList rdebug_list = gnu_parse_rdebug(scratch.arena, is_64bit, rdebug_vaddr, dmn_lnx_machine_op_mem_read, &process->fd);
for EachNode(rdebug_n, GNU_RDebugInfoNode, rdebug_list.first) { for EachNode(rdebug_n, GNU_RDebugInfoNode, rdebug_list.first) {
GNU_LinkMapList link_map_list = gnu_parse_link_map_list(scratch.arena, is_64bit, rdebug_n->v.r_map, dmn_lnx_machine_op_mem_read, process); GNU_LinkMapList link_map_list = gnu_parse_link_map_list(scratch.arena, is_64bit, rdebug_n->v.r_map, dmn_lnx_machine_op_mem_read, &process->fd);
for EachNode(link_map_n, GNU_LinkMapNode, link_map_list.first) { for EachNode(link_map_n, GNU_LinkMapNode, link_map_list.first) {
DMN_LNX_Entity *module = hash_table_search_u64_raw(process->loaded_modules_ht, link_map_n->v.addr_vaddr); DMN_LNX_Entity *module = hash_table_search_u64_raw(process->loaded_modules_ht, link_map_n->v.addr_vaddr);
module->is_live = 1; module->is_live = 1;
@@ -1889,7 +1705,7 @@ dmn_lnx_handle_breakpoint(Arena *arena, DMN_EventList *events, DMN_ActiveTrap *u
if(!stap_read_arg_u(probe->args.v[1], process->arch, thread->reg_block, dmn_lnx_stap_memory_read, process, &rdebug_addr)) { goto init_complete_exit; } if(!stap_read_arg_u(probe->args.v[1], process->arch, thread->reg_block, dmn_lnx_stap_memory_read, process, &rdebug_addr)) { goto init_complete_exit; }
GNU_RDebugInfo64 rdebug = {0}; GNU_RDebugInfo64 rdebug = {0};
if(!dmn_lnx_read_r_debug(process->fd, rdebug_addr, process->arch, &rdebug)) { goto init_complete_exit; } if(gnu_read_r_debug(dmn_lnx_machine_op_mem_read, &process->fd, rdebug_addr, process->arch, &rdebug) != MachineOpResult_Ok) { goto init_complete_exit; }
if(rdebug.r_version < 1) { goto init_complete_exit; } if(rdebug.r_version < 1) { goto init_complete_exit; }
dmn_lnx_handle_load_module(arena, events, process, name_space_id, rdebug.r_map); dmn_lnx_handle_load_module(arena, events, process, name_space_id, rdebug.r_map);
@@ -2083,7 +1899,7 @@ dmn_lnx_handle_attach(Arena *arena, DMN_EventList *events, pid_t pid)
// extract modules from r_debug // extract modules from r_debug
B32 is_64bit = process->dl_class == ELF_Class_64; B32 is_64bit = process->dl_class == ELF_Class_64;
GNU_RDebugInfoList rdebug_list = gnu_parse_rdebug(scratch.arena, is_64bit, process->rdebug_vaddr, dmn_lnx_machine_op_mem_read, process); GNU_RDebugInfoList rdebug_list = gnu_parse_rdebug(scratch.arena, is_64bit, process->rdebug_vaddr, dmn_lnx_machine_op_mem_read, &process->fd);
U64 name_space_id = 0; U64 name_space_id = 0;
for EachNode(rdebug_n, GNU_RDebugInfoNode, rdebug_list.first) for EachNode(rdebug_n, GNU_RDebugInfoNode, rdebug_list.first)
{ {
@@ -2794,6 +2610,15 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
DMN_LNX_Entity *thread = dmn_lnx_thread_from_pid(wait_id); DMN_LNX_Entity *thread = dmn_lnx_thread_from_pid(wait_id);
DMN_LNX_Entity *process = thread->parent; DMN_LNX_Entity *process = thread->parent;
AssertAlways(thread->thread_state == DMN_LNX_ThreadState_PendingCreation || thread->thread_state == DMN_LNX_ThreadState_Stopped);
if(process->expect_user_interrupt)
{
process->expect_user_interrupt = 0;
dmn_lnx_handle_halt(arena, &events);
break;
}
if(thread->thread_state == DMN_LNX_ThreadState_PendingCreation) if(thread->thread_state == DMN_LNX_ThreadState_PendingCreation)
{ {
// finish thread init // finish thread init
@@ -2803,14 +2628,6 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
AssertAlways(dmn_lnx_state->threads_pending_creation > 0); AssertAlways(dmn_lnx_state->threads_pending_creation > 0);
dmn_lnx_state->threads_pending_creation -= 1; dmn_lnx_state->threads_pending_creation -= 1;
} }
else
{
if(process->expect_user_interrupt)
{
process->expect_user_interrupt = 0;
dmn_lnx_handle_halt(arena, &events);
}
}
}break; }break;
default: { Assert(0 && "unexpected ptrace code"); } break; default: { Assert(0 && "unexpected ptrace code"); } break;
} }
@@ -3130,3 +2947,4 @@ dmn_process_iter_end(DMN_ProcessIter *iter)
} }
MemoryZeroStruct(iter); MemoryZeroStruct(iter);
} }
src/demon/linux/demon_core_linux.h
+3 -26
View File
@@ -136,13 +136,6 @@ struct DMN_LNX_ProcessAuxv
U64 pagesz; U64 pagesz;
}; };
typedef struct DMN_LNX_PhdrInfo DMN_LNX_PhdrInfo;
struct DMN_LNX_PhdrInfo
{
Rng1U64 range;
U64 dynamic;
};
typedef struct DMN_LNX_DynamicInfo DMN_LNX_DynamicInfo; typedef struct DMN_LNX_DynamicInfo DMN_LNX_DynamicInfo;
struct DMN_LNX_DynamicInfo struct DMN_LNX_DynamicInfo
{ {
@@ -343,34 +336,21 @@ internal DMN_LNX_EntityNode * dmn_lnx_entity_list_push(Arena *arena, DMN_LNX_Ent
//- rjf: file descriptor memory reading/writing helpers //- rjf: file descriptor memory reading/writing helpers
internal U64 dmn_lnx_read(int memory_fd, Rng1U64 range, void *dst); internal U64 dmn_lnx_read(int memory_fd, Rng1U64 range, void *dst);
internal B32 dmn_lnx_write(int memory_fd, Rng1U64 range, void *src); internal B32 dmn_lnx_write(int memory_fd, Rng1U64 range, void *src);
#define dmn_lnx_read_struct(fd, vaddr, ptr) dmn_lnx_read((fd), r1u64((vaddr), (vaddr)+sizeof(*(ptr))), (ptr))
#define dmn_lnx_write_struct(fd, vaddr, ptr) dmn_lnx_write((fd), r1u64((vaddr), (vaddr)+sizeof(*(ptr))), (ptr))
internal String8 dmn_lnx_read_string_capped(Arena *arena, int memory_fd, U64 base_vaddr, U64 cap_size); internal String8 dmn_lnx_read_string_capped(Arena *arena, int memory_fd, U64 base_vaddr, U64 cap_size);
internal String8 dmn_lnx_read_string(Arena *arena, int memory_fd, U64 base_vaddr); internal String8 dmn_lnx_read_string(Arena *arena, int memory_fd, U64 base_vaddr);
#define dmn_lnx_read_struct(fd, vaddr, ptr) dmn_lnx_read((fd), r1u64((vaddr), (vaddr)+sizeof(*(ptr))), (ptr))
//////////////////////////////// #define dmn_lnx_write_struct(fd, vaddr, ptr) dmn_lnx_write((fd), r1u64((vaddr), (vaddr)+sizeof(*(ptr))), (ptr))
//~ Runtime Struct Helpers
internal B32 dmn_lnx_read_ehdr(int memory_fd, U64 addr, ELF_Hdr64 *ehdr_out);
internal B32 dmn_lnx_read_phdr(int memory_fd, U64 addr, ELF_Class elf_class, ELF_Phdr64 *phdr_out);
internal B32 dmn_lnx_read_shdr(int memory_fd, U64 addr, ELF_Class elf_class, ELF_Shdr64 *shdr_out);
internal B32 dmn_lnx_read_linkmap(int memory_fd, U64 addr, ELF_Class elf_class, GNU_LinkMap64 *link_map_out);
internal B32 dmn_lnx_read_dynamic(int memory_fd, U64 addr, ELF_Class elf_class, ELF_Dyn64 *dyn_out);
internal B32 dmn_lnx_read_symbol(int memory_fd, U64 addr, ELF_Class elf_class, ELF_Sym64 *symbol_out);
internal B32 dmn_lnx_read_r_debug(int memory_fd, U64 addr, Arch arch, GNU_RDebugInfo64 *rdebug_out);
//- rjf: pid => info extraction //- rjf: pid => info extraction
internal String8 dmn_lnx_exe_path_from_pid(Arena *arena, pid_t pid); internal String8 dmn_lnx_exe_path_from_pid(Arena *arena, pid_t pid);
internal String8 dmn_lnx_dl_path_from_pid(Arena *arena, pid_t pid, U64 auxv_base);
internal ELF_Hdr64 dmn_lnx_ehdr_from_pid(pid_t pid); internal ELF_Hdr64 dmn_lnx_ehdr_from_pid(pid_t pid);
internal DMN_LNX_ProcessAuxv dmn_lnx_auxv_from_pid(pid_t pid, ELF_Class elf_class); internal DMN_LNX_ProcessAuxv dmn_lnx_auxv_from_pid(pid_t pid, ELF_Class elf_class);
//- ELF/GNU info from memory //- ELF/GNU info from memory
internal DMN_LNX_PhdrInfo dmn_lnx_phdr_info_from_memory(int memory_fd, ELF_Class elf_class, U64 rebase, U64 e_phaddr, U64 e_phentsize, U64 e_phnum);
internal DMN_LNX_DynamicInfo dmn_lnx_dynamic_info_from_memory(int memory_fd, ELF_Class elf_Class, U64 rebase, U64 dynamic_vaddr); internal DMN_LNX_DynamicInfo dmn_lnx_dynamic_info_from_memory(int memory_fd, ELF_Class elf_Class, U64 rebase, U64 dynamic_vaddr);
internal U64 dmn_lnx_rdebug_vaddr_from_memory(int memory_fd, U64 loader_vaddr, B32 is_rebased); internal U64 dmn_lnx_rdebug_vaddr_from_memory(int memory_fd, U64 loader_vaddr, B32 is_rebased);
internal String8 dmn_lnx_dl_path_from_pid(Arena *arena, pid_t pid, U64 auxv_base);
//////////////////////////////// ////////////////////////////////
//~ rjf: Entity Functions //~ rjf: Entity Functions
@@ -390,9 +370,6 @@ internal void dmn_lnx_thread_write_ip(DMN_LNX_Entity *thread, U64 ip);
internal void dmn_lnx_thread_write_sp(DMN_LNX_Entity *thread, U64 sp); internal void dmn_lnx_thread_write_sp(DMN_LNX_Entity *thread, U64 sp);
internal B32 dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread); internal B32 dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread);
internal B32 dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread); internal B32 dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread);
////////////////////////////////
internal B32 dmn_lnx_set_single_step_flag(DMN_LNX_Entity *thread, B32 is_on); internal B32 dmn_lnx_set_single_step_flag(DMN_LNX_Entity *thread, B32 is_on);
#endif // DEMON_CORE_LINUX_H #endif // DEMON_CORE_LINUX_H
src/elf/elf.c
+112
View File
@@ -179,3 +179,115 @@ elf_dyn_size_from_class(ELF_Class elf_class)
return result; return result;
} }
////////////////////////////////
internal MachineOpResult
elf_read_ehdr(MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Hdr64 *ehdr_out)
{
U8 e_ident[ELF_Identifier_Max] = {0};
MachineOpResult result = mem_read(addr, &e_ident, sizeof(e_ident), mem_read_ud);
if (result == MachineOpResult_Ok) {
if (str8_match(str8_prefix(str8_array_fixed(e_ident), elf_magic_string.size), elf_magic_string, 0)) {
switch (e_ident[ELF_Identifier_Class]) {
default: { InvalidPath; }break;
case ELF_Class_None: { }break;
case ELF_Class_32: {
ELF_Hdr32 ehdr32 = {0};
result = mem_read(addr, &ehdr32, sizeof(ehdr32), mem_read_ud);
if (result == MachineOpResult_Ok) {
*ehdr_out = elf_hdr64_from_hdr32(ehdr32);
}
} break;
case ELF_Class_64: {
result = mem_read(addr, ehdr_out, sizeof(*ehdr_out), mem_read_ud);
} break;
}
}
}
return result;
}
internal MachineOpResult
elf_read_phdr(MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Class elf_class, ELF_Phdr64 *phdr_out)
{
MachineOpResult result = MachineOpResult_Fail;
switch (elf_class) {
case ELF_Class_None: break;
case ELF_Class_32: {
ELF_Phdr32 phdr32 = {0};
result = mem_read(addr, &phdr32, sizeof(phdr32), mem_read_ud);
if (result == MachineOpResult_Ok) {
*phdr_out = elf_phdr64_from_phdr32(phdr32);
}
} break;
case ELF_Class_64: {
result = mem_read(addr, phdr_out, sizeof(*phdr_out), mem_read_ud);
} break;
default: { NotImplemented; } break;
}
return result;
}
internal MachineOpResult
elf_read_shdr(MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Class elf_class, ELF_Shdr64 *shdr_out)
{
MachineOpResult result = MachineOpResult_Fail;
switch (elf_class) {
case ELF_Class_None: break;
case ELF_Class_32: {
ELF_Shdr32 shdr32 = {0};
result = mem_read(addr, &shdr32, sizeof(shdr32), mem_read_ud);
if (result == MachineOpResult_Ok) {
*shdr_out = elf_shdr64_from_shdr32(shdr32);
}
} break;
case ELF_Class_64: {
result = mem_read(addr, shdr_out, sizeof(*shdr_out), mem_read_ud);
} break;
default: { NotImplemented; } break;
}
return result;
}
internal MachineOpResult
elf_read_dyn(MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Class elf_class, ELF_Dyn64 *dyn_out)
{
MachineOpResult result = MachineOpResult_Fail;
switch (elf_class) {
case ELF_Class_None: {} break;
case ELF_Class_32: {
ELF_Dyn32 dyn32 = {0};
result = mem_read(addr, &dyn32, sizeof(dyn32), mem_read_ud);
if (result == MachineOpResult_Fail) {
*dyn_out = elf_dyn64_from_dyn32(dyn32);
}
} break;
case ELF_Class_64: {
result = mem_read(addr, dyn_out, sizeof(*dyn_out), mem_read_ud);
} break;
default: { NotImplemented; } break;
}
return result;
}
internal MachineOpResult
elf_read_symbol(MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Class elf_class, ELF_Sym64 *symbol_out)
{
MachineOpResult result = MachineOpResult_Fail;
switch (elf_class) {
case ELF_Class_None: {} break;
case ELF_Class_32: {
ELF_Sym32 symbol32 = {0};
result = mem_read(addr, &symbol32, sizeof(symbol32), mem_read_ud);
if (result == MachineOpResult_Ok) {
*symbol_out = elf_sym64_from_sym32(symbol32);
}
}break;
case ELF_Class_64: {
result = mem_read(addr, symbol_out, sizeof(*symbol_out), mem_read_ud);
}break;
default: { NotImplemented; } break;
}
return result;
}
src/elf/elf.h
+9
View File
@@ -841,4 +841,13 @@ internal Arch arch_from_elf_machine(ELF_MachineKind machine);
internal U64 elf_phdr_size_from_class(ELF_Class elf_class); internal U64 elf_phdr_size_from_class(ELF_Class elf_class);
internal U64 elf_dyn_size_from_class(ELF_Class elf_class); internal U64 elf_dyn_size_from_class(ELF_Class elf_class);
////////////////////////////////
//~ Compat Readers
internal MachineOpResult elf_read_ehdr (MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Hdr64 *ehdr_out);
internal MachineOpResult elf_read_phdr (MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Class elf_class, ELF_Phdr64 *phdr_out);
internal MachineOpResult elf_read_shdr (MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Class elf_class, ELF_Shdr64 *shdr_out);
internal MachineOpResult elf_read_dyn (MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Class elf_class, ELF_Dyn64 *dyn_out);
internal MachineOpResult elf_read_symbol(MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, ELF_Class elf_class, ELF_Sym64 *symbol_out);
#endif // ELF_H #endif // ELF_H
src/gnu/gnu.c
+37
View File
@@ -276,3 +276,40 @@ gnu_string_from_property_flags_x86(Arena *arena, GNU_PropertyX86 prop, U32 flags
return result; return result;
} }
internal MachineOpResult
gnu_read_link_map(MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, B32 is_64bit, GNU_LinkMap64 *link_map_out)
{
MachineOpResult result = MachineOpResult_Fail;
if (is_64bit) {
result = mem_read(addr, link_map_out, sizeof(*link_map_out), mem_read_ud);
} else {
GNU_LinkMap32 link_map_32 = {0};
result = mem_read(addr, &link_map_32, sizeof(link_map_32), mem_read_ud);
if (result == MachineOpResult_Ok) {
*link_map_out = gnu_linkmap64_from_linkmap32(link_map_32);
}
}
return result;
}
internal MachineOpResult
gnu_read_r_debug(MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, Arch arch, GNU_RDebugInfo64 *rdebug_out)
{
MachineOpResult result = MachineOpResult_Fail;
switch (gnu_rdebug_info_size_from_arch(arch)) {
case 0: {} break;
case sizeof(GNU_RDebugInfo32): {
GNU_RDebugInfo32 rdebug32 = {0};
result = mem_read(addr, &rdebug32, sizeof(rdebug32), mem_read_ud);
if (result == MachineOpResult_Ok) {
*rdebug_out = gnu_rdebug_info64_from_rdebug_info32(rdebug32);
}
} break;
case sizeof(GNU_RDebugInfo64): {
result = mem_read(addr, rdebug_out, sizeof(*rdebug_out), mem_read_ud);
} break;
default: { InvalidPath; } break;
}
return result;
}
src/gnu/gnu.h
+6
View File
@@ -201,4 +201,10 @@ internal String8 gnu_string_from_abi_tag(GNU_AbiTag abi_tag);
internal String8 gnu_string_from_note_type(GNU_NoteType note_type); internal String8 gnu_string_from_note_type(GNU_NoteType note_type);
internal String8 gnu_string_from_property_x86(GNU_PropertyX86 prop); internal String8 gnu_string_from_property_x86(GNU_PropertyX86 prop);
////////////////////////////////
//~ Compat Readers
internal MachineOpResult gnu_read_link_map(MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, B32 is_64bit, GNU_LinkMap64 *link_map_out);
internal MachineOpResult gnu_read_r_debug (MachineOp_MemRead *mem_read, void *mem_read_ud, U64 addr, Arch arch, GNU_RDebugInfo64 *rdebug_out);
#endif // GNU_H #endif // GNU_H