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LibC: Save callee saved registers on setjmp

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Bananymous
2025-05-04 13:54:35 +03:00
parent d457e6ad6a
commit 82f4975f45
4 changed files with 43 additions and 11 deletions
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10
userspace/libraries/LibC/setjmp.cpp
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@@ -1,19 +1,19 @@
#include <setjmp.h>
#include <signal.h>
static_assert(sizeof(sigjmp_buf) == sizeof(jmp_buf) + sizeof(long) + sizeof(sigset_t));
static_assert(sizeof(sigjmp_buf) == (_JMP_BUF_REGS + 1) * sizeof(long) + sizeof(sigset_t));
void siglongjmp(sigjmp_buf env, int val)
{
if (env[2])
pthread_sigmask(SIG_SETMASK, reinterpret_cast<sigset_t*>(&env[3]), nullptr);
if (env[_JMP_BUF_REGS])
pthread_sigmask(SIG_SETMASK, reinterpret_cast<sigset_t*>(&env[_JMP_BUF_REGS + 1]), nullptr);
return longjmp(env, val);
}
int sigsetjmp(sigjmp_buf env, int savemask)
{
env[2] = savemask;
env[_JMP_BUF_REGS] = savemask;
if (savemask)
pthread_sigmask(0, nullptr, reinterpret_cast<sigset_t*>(&env[3]));
pthread_sigmask(0, nullptr, reinterpret_cast<sigset_t*>(&env[_JMP_BUF_REGS + 1]));
return setjmp(env);
}