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Manually load required symbols.

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This commit is contained in:
Bartosz Taudul 2019-09-27 00:05:41 +02:00
parent 9de2d312a3
commit 6094d69479
2 changed files with 24 additions and 7 deletions
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2
extra/systrace/build
View File

@ -1,3 +1,3 @@
clang tracy_systrace.c -s -Os -ffunction-sections -fdata-sections -Wl,--gc-sections -fno-stack-protector -Wl,-z,norelro -Wl,--build-id=none -nostdlib -lc
clang tracy_systrace.c -s -Os -ffunction-sections -fdata-sections -Wl,--gc-sections -fno-stack-protector -Wl,-z,norelro -Wl,--build-id=none -nostdlib -ldl
strip --strip-all -R .note.gnu.gold-version -R .comment -R .note -R .note.gnu.build-id -R .note.ABI-tag -R .eh_frame -R .eh_frame_hdr -R .gnu.hash -R .gnu.version -R .got a.out
sstrip -z a.out (elfkickers)

29
extra/systrace/tracy_systrace.c
View File

@ -6,15 +6,32 @@
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <dlfcn.h>
enum { BufSize = 64*1024 };
typedef int (*open_t)( const char*, int, ... );
typedef void (*exit_t)( int );
typedef int (*poll_t)( struct pollfd*, nfds_t, int timeout );
typedef int (*nanosleep_t)( const struct timespec*, struct timespec* );
typedef ssize_t (*read_t)( int, void*, size_t );
typedef ssize_t (*write_t)( int, const void*, size_t );
void _start()
{
void* libc = dlopen( "libc.so", RTLD_LAZY );
open_t sym_open = dlsym( libc, "open" );
exit_t sym_exit = dlsym( libc, "exit" );
poll_t sym_poll = dlsym( libc, "poll" );
nanosleep_t sym_nanosleep = dlsym( libc, "nanosleep" );
read_t sym_read = dlsym( libc, "read" );
write_t sym_write = dlsym( libc, "write" );
char buf[BufSize];
int kernelFd = open( "/sys/kernel/debug/tracing/trace_pipe", O_RDONLY );
if( kernelFd < 0 ) exit( 0 );
int kernelFd = sym_open( "/sys/kernel/debug/tracing/trace_pipe", O_RDONLY );
if( kernelFd < 0 ) sym_exit( 0 );
struct pollfd pfd;
pfd.fd = kernelFd;
@ -26,11 +43,11 @@ void _start()
for(;;)
{
while( poll( &pfd, 1, 0 ) <= 0 ) nanosleep( &sleepTime, NULL );
const int rd = read( kernelFd, buf, BufSize );
while( sym_poll( &pfd, 1, 0 ) <= 0 ) sym_nanosleep( &sleepTime, NULL );
const int rd = sym_read( kernelFd, buf, BufSize );
if( rd <= 0 ) break;
write( STDOUT_FILENO, buf, rd );
sym_write( STDOUT_FILENO, buf, rd );
}
exit( 0 );
sym_exit( 0 );
}