Implement signal handler tail recursion

GNU Make on Windows now appears to be working reliably. This change also
fixes a bug where, after fork the Windows thread handle wasn't reset and
that caused undefined behavior using SetThreadContext() with our signals

libc/nt/master.sh

@@ -598,6 +598,10 @@ imp	'PdhOpenQuery'						PdhOpenQueryW						pdh		3	# Creates a new query that is
 # PSAPI.DLL
 #
 #	Name							Actual							DLL		Arity
+imp	'EnumProcessModules'					EnumProcessModules					psapi		4
+imp	'EnumProcessModulesEx'					EnumProcessModulesEx					psapi		5
+imp	'EnumProcesses'						EnumProcesses						psapi		3
+imp	'GetModuleBaseName'					GetModuleBaseNameW					psapi		4
 imp	'GetProcessImageFileName'				GetProcessImageFileNameW				psapi		3
 imp	'GetProcessMemoryInfo'					GetProcessMemoryInfo					psapi		3
 

libc/nt/process.h

@@ -78,6 +78,17 @@ int64_t CreateToolhelp32Snapshot(uint32_t dwFlags, uint32_t th32ProcessID);
 bool32 Process32First(int64_t hSnapshot, struct NtProcessEntry32 *in_out_lppe);
 bool32 Process32Next(int64_t hSnapshot, struct NtProcessEntry32 *out_lppe);
 
+bool32 EnumProcesses(uint32_t *out_lpidProcess, uint32_t cb,
+                     uint32_t *out_lpcbNeeded) paramsnonnull();
+bool32 EnumProcessModules(int64_t hProcess, int64_t *out_lphModule, uint32_t cb,
+                          uint32_t *out_lpcbNeeded) paramsnonnull();
+bool32 EnumProcessModulesEx(int64_t hProcess, int64_t *out_lphModule,
+                            uint32_t cb, uint32_t *out_lpcbNeeded,
+                            uint32_t dwFilterFlag) paramsnonnull();
+uint32_t GetModuleBaseName(int64_t hProcess, int64_t opt_hModule,
+                           char16_t *out_lpBaseName, uint32_t nSize)
+    paramsnonnull();
+
 #if ShouldUseMsabiAttribute()
 #include "libc/nt/thunk/process.inc"
 #endif /* ShouldUseMsabiAttribute() */

libc/nt/psapi/EnumProcessModules.S

@@ -0,0 +1,18 @@
+#include "libc/nt/codegen.h"
+.imp	psapi,__imp_EnumProcessModules,EnumProcessModules
+
+	.text.windows
+        .ftrace1
+EnumProcessModules:
+        .ftrace2
+#ifdef __x86_64__
+	push	%rbp
+	mov	%rsp,%rbp
+	mov	__imp_EnumProcessModules(%rip),%rax
+	jmp	__sysv2nt
+#elif defined(__aarch64__)
+	mov	x0,#0
+	ret
+#endif
+	.endfn	EnumProcessModules,globl
+	.previous

libc/nt/psapi/EnumProcessModulesEx.S

@@ -0,0 +1,18 @@
+#include "libc/nt/codegen.h"
+.imp	psapi,__imp_EnumProcessModulesEx,EnumProcessModulesEx
+
+	.text.windows
+        .ftrace1
+EnumProcessModulesEx:
+        .ftrace2
+#ifdef __x86_64__
+	push	%rbp
+	mov	%rsp,%rbp
+	mov	__imp_EnumProcessModulesEx(%rip),%rax
+	jmp	__sysv2nt6
+#elif defined(__aarch64__)
+	mov	x0,#0
+	ret
+#endif
+	.endfn	EnumProcessModulesEx,globl
+	.previous

libc/nt/psapi/EnumProcesses.S

@@ -0,0 +1,18 @@
+#include "libc/nt/codegen.h"
+.imp	psapi,__imp_EnumProcesses,EnumProcesses
+
+	.text.windows
+        .ftrace1
+EnumProcesses:
+        .ftrace2
+#ifdef __x86_64__
+	push	%rbp
+	mov	%rsp,%rbp
+	mov	__imp_EnumProcesses(%rip),%rax
+	jmp	__sysv2nt
+#elif defined(__aarch64__)
+	mov	x0,#0
+	ret
+#endif
+	.endfn	EnumProcesses,globl
+	.previous

libc/nt/psapi/GetModuleBaseNameW.S

@@ -0,0 +1,18 @@
+#include "libc/nt/codegen.h"
+.imp	psapi,__imp_GetModuleBaseNameW,GetModuleBaseNameW
+
+	.text.windows
+        .ftrace1
+GetModuleBaseName:
+        .ftrace2
+#ifdef __x86_64__
+	push	%rbp
+	mov	%rsp,%rbp
+	mov	__imp_GetModuleBaseNameW(%rip),%rax
+	jmp	__sysv2nt
+#elif defined(__aarch64__)
+	mov	x0,#0
+	ret
+#endif
+	.endfn	GetModuleBaseName,globl
+	.previous