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Get cosmo_dlopen() working better on System Five

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Imported functions are now aspected with a trampoline that blocks
signals and changes the thread-local storage register. This means
bigger more complicated libraries can now be imported even though
the whole technique remains fundamentally unsafe.
This commit is contained in:
Justine Tunney 2023-11-15 10:48:31 -08:00
parent 3a470ed356
commit e4584ace81
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GPG key ID: BE714B4575D6E328
6 changed files with 304 additions and 190 deletions
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4
libc/intrin/kprintf.greg.c
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@ -471,7 +471,6 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt,
p = b;
f = fmt;
e = p + n; // assume if n was negative e < p will be the case
tib = __tls_enabled ? __get_tls_privileged() : 0;
for (;;) {
for (;;) {
if (!(c = *f++) || c == '%') break;
@ -582,6 +581,7 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt,
goto FormatUnsigned;
case 'P':
tib = __tls_enabled ? __get_tls_privileged() : 0;
if (!(tib && (tib->tib_flags & TIB_FLAG_VFORKED))) {
x = __pid;
#ifdef __x86_64__
@ -607,6 +607,7 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt,
goto FormatDecimal;
case 'H':
tib = __tls_enabled ? __get_tls_privileged() : 0;
if (!(tib && (tib->tib_flags & TIB_FLAG_VFORKED))) {
if (tib) {
x = atomic_load_explicit(&tib->tib_tid, memory_order_relaxed);
@ -760,6 +761,7 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt,
case 'm': {
int e;
tib = __tls_enabled ? __get_tls_privileged() : 0;
if (!(e = tib ? tib->tib_errno : __errno) && sign == ' ') {
break;
} else {