Make numerous improvements

- Python static hello world now 1.8mb
- Python static fully loaded now 10mb
- Python HTTPS client now uses MbedTLS
- Python REPL now completes import stmts
- Increase stack size for Python for now
- Begin synthesizing posixpath and ntpath
- Restore Python \N{UNICODE NAME} support
- Restore Python NFKD symbol normalization
- Add optimized code path for Intel SHA-NI
- Get more Python unit tests passing faster
- Get Python help() pagination working on NT
- Python hashlib now supports MbedTLS PBKDF2
- Make memcpy/memmove/memcmp/bcmp/etc. faster
- Add Mersenne Twister and Vigna to LIBC_RAND
- Provide privileged __printf() for error code
- Fix zipos opendir() so that it reports ENOTDIR
- Add basic chmod() implementation for Windows NT
- Add Cosmo's best functions to Python cosmo module
- Pin function trace indent depth to that of caller
- Show memory diagram on invalid access in MODE=dbg
- Differentiate stack overflow on crash in MODE=dbg
- Add stb_truetype and tools for analyzing font files
- Upgrade to UNICODE 13 and reduce its binary footprint
- COMPILE.COM now logs resource usage of build commands
- Start implementing basic poll() support on bare metal
- Set getauxval(AT_EXECFN) to GetModuleFileName() on NT
- Add descriptions to strerror() in non-TINY build modes
- Add COUNTBRANCH() macro to help with micro-optimizations
- Make error / backtrace / asan / memory code more unbreakable
- Add fast perfect C implementation of μ-Law and a-Law audio codecs
- Make strtol() functions consistent with other libc implementations
- Improve Linenoise implementation (see also github.com/jart/bestline)
- COMPILE.COM now suppresses stdout/stderr of successful build commands

libc/calls/sigenter-freebsd.c

@@ -124,7 +124,7 @@ void __sigenter_freebsd(int sig, struct siginfo_freebsd *si,
   ucontext_t uc;
   rva = __sighandrvas[sig & (NSIG - 1)];
   if (rva >= kSigactionMinRva) {
-    memset(&uc, 0, sizeof(uc));
+    bzero(&uc, sizeof(uc));
     if (ctx) {
       uc.uc_mcontext.fpregs = &uc.__fpustate;
       uc.uc_stack.ss_sp = ctx->uc_stack.ss_sp;
@@ -155,6 +155,7 @@ void __sigenter_freebsd(int sig, struct siginfo_freebsd *si,
       uc.uc_mcontext.gs = ctx->uc_mcontext.mc_gs;
       uc.uc_mcontext.err = ctx->uc_mcontext.mc_err;
       uc.uc_mcontext.trapno = ctx->uc_mcontext.mc_trapno;
+      memcpy(&uc.__fpustate, &ctx->uc_mcontext.mc_fpstate, 512);
     }
     ((sigaction_f)(_base + rva))(sig, (void *)si, &uc);
     if (ctx) {
@@ -186,6 +187,7 @@ void __sigenter_freebsd(int sig, struct siginfo_freebsd *si,
       ctx->uc_mcontext.mc_err = uc.uc_mcontext.err;
       ctx->uc_mcontext.mc_rip = uc.uc_mcontext.rip;
       ctx->uc_mcontext.mc_rsp = uc.uc_mcontext.rsp;
+      memcpy(&ctx->uc_mcontext.mc_fpstate, &uc.__fpustate, 512);
     }
   }
   /*