mirror of
https://github.com/wolfpld/tracy.git
synced 2024-11-30 01:04:36 +00:00
121 lines
2.8 KiB
C++
121 lines
2.8 KiB
C++
#ifdef __linux__
|
|
|
|
#include <algorithm>
|
|
#include <assert.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <unistd.h>
|
|
|
|
#include "TracyDebug.hpp"
|
|
#include "TracyKCore.hpp"
|
|
#include "../common/TracyAlloc.hpp"
|
|
|
|
#if !defined(__GLIBC__) && !defined(__WORDSIZE)
|
|
// include __WORDSIZE headers for musl
|
|
# include <bits/reg.h>
|
|
#endif
|
|
|
|
namespace tracy
|
|
{
|
|
|
|
using elf_half = uint16_t;
|
|
using elf_word = uint32_t;
|
|
using elf_sword = int32_t;
|
|
|
|
#if __WORDSIZE == 32
|
|
using elf_addr = uint32_t;
|
|
using elf_off = uint32_t;
|
|
using elf_xword = uint32_t;
|
|
#else
|
|
using elf_addr = uint64_t;
|
|
using elf_off = uint64_t;
|
|
using elf_xword = uint64_t;
|
|
#endif
|
|
|
|
struct elf_ehdr
|
|
{
|
|
unsigned char e_ident[16];
|
|
elf_half e_type;
|
|
elf_half e_machine;
|
|
elf_word e_version;
|
|
elf_addr e_entry;
|
|
elf_off e_phoff;
|
|
elf_off e_shoff;
|
|
elf_word e_flags;
|
|
elf_half e_ehsize;
|
|
elf_half e_phentsize;
|
|
elf_half e_phnum;
|
|
elf_half e_shentsize;
|
|
elf_half e_shnum;
|
|
elf_half e_shstrndx;
|
|
};
|
|
|
|
struct elf_phdr
|
|
{
|
|
elf_word p_type;
|
|
elf_word p_flags;
|
|
elf_off p_offset;
|
|
elf_addr p_vaddr;
|
|
elf_addr p_paddr;
|
|
elf_xword p_filesz;
|
|
elf_xword p_memsz;
|
|
uint64_t p_align; // include 32-bit-only flags field for 32-bit compatibility
|
|
};
|
|
|
|
KCore::KCore()
|
|
: m_offsets( 16 )
|
|
{
|
|
m_fd = open( "/proc/kcore", O_RDONLY );
|
|
if( m_fd == -1 ) return;
|
|
|
|
elf_ehdr ehdr;
|
|
if( read( m_fd, &ehdr, sizeof( ehdr ) ) != sizeof( ehdr ) ) goto err;
|
|
|
|
assert( ehdr.e_phentsize == sizeof( elf_phdr ) );
|
|
|
|
for( elf_half i=0; i<ehdr.e_phnum; i++ )
|
|
{
|
|
elf_phdr phdr;
|
|
if( lseek( m_fd, ehdr.e_phoff + i * ehdr.e_phentsize, SEEK_SET ) == -1 ) goto err;
|
|
if( read( m_fd, &phdr, sizeof( phdr ) ) != sizeof( phdr ) ) goto err;
|
|
if( phdr.p_type != 1 ) continue;
|
|
|
|
auto ptr = m_offsets.push_next();
|
|
ptr->start = phdr.p_vaddr;
|
|
ptr->size = phdr.p_memsz;
|
|
ptr->offset = phdr.p_offset;
|
|
}
|
|
|
|
std::sort( m_offsets.begin(), m_offsets.end(), []( const Offset& lhs, const Offset& rhs ) { return lhs.start < rhs.start; } );
|
|
TracyDebug( "KCore: %zu segments found\n", m_offsets.size() );
|
|
return;
|
|
|
|
err:
|
|
close( m_fd );
|
|
m_fd = -1;
|
|
}
|
|
|
|
KCore::~KCore()
|
|
{
|
|
if( m_fd != -1 ) close( m_fd );
|
|
}
|
|
|
|
void* KCore::Retrieve( uint64_t addr, uint64_t size ) const
|
|
{
|
|
if( m_fd == -1 ) return nullptr;
|
|
auto it = std::lower_bound( m_offsets.begin(), m_offsets.end(), addr, []( const Offset& lhs, uint64_t rhs ) { return lhs.start + lhs.size < rhs; } );
|
|
if( it == m_offsets.end() ) return nullptr;
|
|
if( addr + size > it->start + it->size ) return nullptr;
|
|
if( lseek( m_fd, it->offset + addr - it->start, SEEK_SET ) == -1 ) return nullptr;
|
|
auto ptr = tracy_malloc( size );
|
|
if( read( m_fd, ptr, size ) != ssize_t( size ) )
|
|
{
|
|
tracy_free( ptr );
|
|
return nullptr;
|
|
}
|
|
return ptr;
|
|
}
|
|
|
|
}
|
|
|
|
#endif |