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Validate privileged code relationships

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- Work towards improving non-optimized build support
- Introduce MODE=zero which is -O0 without ASAN/UBSAN
- Use system GCC when ~/.cosmo.mk has USE_SYSTEM_TOOLCHAIN=1
- Have package.com check .privileged code doesn't call non-privileged
This commit is contained in:
Justine Tunney 2023-06-08 04:37:05 -07:00
parent 01fd655097
commit daf4454a06
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GPG key ID: BE714B4575D6E328
82 changed files with 808 additions and 850 deletions
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25
libc/runtime/ftracer.c
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@ -27,7 +27,6 @@
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/stack.h"
#include "libc/runtime/symbols.internal.h"
#include "libc/thread/tls.h"
#include "libc/thread/tls2.h"
@ -47,9 +46,7 @@
#define DETOUR_SKEW 8
#endif
void ftrace_hook(void);
static int g_stackdigs;
extern _Hide int ftrace_stackdigs;
static struct CosmoFtrace g_ftrace;
static privileged inline int GetNestingLevelImpl(struct StackFrame *frame) {
@ -73,9 +70,11 @@ static privileged inline int GetNestingLevel(struct CosmoFtrace *ft,
/**
* Prints name of function being called.
*
* We insert CALL instructions that point to this function, in the
* prologues of other functions. We assume those functions behave
* according to the System Five NexGen32e ABI.
* Whenever a function is called, ftrace_hook() will be called from the
* function prologue which saves the parameter registers and calls this
* function, which is responsible for logging the function call.
*
* @see ftrace_install()
*/
privileged void ftracer(void) {
uintptr_t fn;
@ -101,20 +100,10 @@ privileged void ftracer(void) {
fn = sf->addr + DETOUR_SKEW;
if (fn != ft->ft_lastaddr) {
stackuse = GetStackAddr() + GetStackSize() - (intptr_t)sf;
kprintf("%rFUN %6P %'13T %'*ld %*s%t\n", g_stackdigs, stackuse,
kprintf("%rFUN %6P %'13T %'*ld %*s%t\n", ftrace_stackdigs, stackuse,
GetNestingLevel(ft, sf) * 2, "", fn);
ft->ft_lastaddr = fn;
}
ft->ft_noreentry = false;
}
}
textstartup int ftrace_install(void) {
if (GetSymbolTable()) {
g_stackdigs = LengthInt64Thousands(GetStackSize());
return __hook(ftrace_hook, GetSymbolTable());
} else {
kprintf("error: --ftrace failed to open symbol table\n");
return -1;
}
}