From f65c6aec2523148f2a1f4c144872f6f91047ef2c Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Mon, 16 Sep 2019 06:36:16 +0000
Subject: mgdb: {amd64|i386}_winnt_store_registers(): initial implementation.

---
 overlay/mgdb/gdb/amd64-winnt-regcache.c | 39 +++++++++++++++++++++++++++++++++
 overlay/mgdb/gdb/i386-winnt-regcache.c  | 10 +++++++++
 overlay/mgdb/gdb/winnt-nat.c            | 19 +++++++++++++---
 overlay/mgdb/gdb/winnt-nat.h            |  8 +++++++
 4 files changed, 73 insertions(+), 3 deletions(-)

diff --git a/overlay/mgdb/gdb/amd64-winnt-regcache.c b/overlay/mgdb/gdb/amd64-winnt-regcache.c
index 7a1dab6..86a4b28 100644
--- a/overlay/mgdb/gdb/amd64-winnt-regcache.c
+++ b/overlay/mgdb/gdb/amd64-winnt-regcache.c
@@ -13,6 +13,8 @@
 #include <signal.h>
 #include <sys/debug.h>
 
+#define AMD64_KNOWN_REG_CAP AMD64_MXCSR_REGNUM
+
 struct regcache;
 
 static unsigned regoffs[AMD64_NUM_REGS];
@@ -87,6 +89,43 @@ void amd64_winnt_fetch_registers(
 	regctx->uc_context_flags = WINNT_THREAD_CONTEXT_READY;
 }
 
+void amd64_winnt_store_registers(
+	const struct regcache * rcache,
+	int                     regnum,
+	struct winnt_thread *   thread)
+{
+	int          pfd;
+	pid_t        tid;
+	int          rmin;
+	int          rmax;
+	char *       mark;
+	mcontext_t * regctx;
+
+	if (regnum > AMD64_KNOWN_REG_CAP)
+		return;
+
+	if (regnum < 0) {
+		rmin = 0;
+		rmax = AMD64_KNOWN_REG_CAP;
+	} else {
+		rmin = regnum;
+		rmax = regnum;
+	}
+
+	pfd    = thread->process->pfd;
+	tid    = thread->tid;
+	regctx = &thread->regctx;
+	mark   = (char *)regctx;
+
+	for (regnum=rmin; regnum<=rmax; regnum++)
+		regcache_raw_collect(
+			rcache,regnum,
+			mark + regoffs[regnum]);
+
+	if (!__dbg_regs_store(pfd,tid,regctx))
+		regctx->uc_context_flags = WINNT_THREAD_CONTEXT_READY;
+}
+
 #define AMD64_WINNT_INIT_REG_OFFSET(regnum,regmem) \
 	regoffs[regnum] = offsetof(mcontext_t,regmem)
 
diff --git a/overlay/mgdb/gdb/i386-winnt-regcache.c b/overlay/mgdb/gdb/i386-winnt-regcache.c
index 7941fd3..d3745a1 100644
--- a/overlay/mgdb/gdb/i386-winnt-regcache.c
+++ b/overlay/mgdb/gdb/i386-winnt-regcache.c
@@ -20,3 +20,13 @@ void i386_winnt_fetch_registers(
 	(void)regnum;
 	(void)thread;
 }
+
+void i386_winnt_store_registers(
+	const struct regcache * rcache,
+	int                     regnum,
+	struct winnt_thread *   thread)
+{
+	(void)rcache;
+	(void)regnum;
+	(void)thread;
+}
diff --git a/overlay/mgdb/gdb/winnt-nat.c b/overlay/mgdb/gdb/winnt-nat.c
index 5ce4a4c..a52ce8e 100644
--- a/overlay/mgdb/gdb/winnt-nat.c
+++ b/overlay/mgdb/gdb/winnt-nat.c
@@ -678,9 +678,22 @@ static void winnt_store_registers (
 	struct regcache *   rcache,
 	int                 regnum)
 {
-	(void)t;
-	(void)rcache;
-	(void)regnum;
+	pid_t                 tid;
+	struct winnt_thread * thread;
+
+	tid = inferior_ptid.tid;
+
+	if (!(thread = winnt_get_thread_from_ptid(inferior_ptid)))
+		winnt_perror("internal error: thread record not found",tid);
+
+	if (sizeof(uintptr_t) == 8)
+		amd64_winnt_store_registers(
+			rcache,regnum,
+			thread);
+	else
+		i386_winnt_store_registers(
+			rcache,regnum,
+			thread);
 }
 
 static void winnt_attach (struct target_ops * t, const char * args, int from_tty)
diff --git a/overlay/mgdb/gdb/winnt-nat.h b/overlay/mgdb/gdb/winnt-nat.h
index c99d3f4..473c2a9 100644
--- a/overlay/mgdb/gdb/winnt-nat.h
+++ b/overlay/mgdb/gdb/winnt-nat.h
@@ -50,8 +50,16 @@ void amd64_winnt_fetch_registers(
 	struct regcache *, int regnum,
 	struct winnt_thread *);
 
+void amd64_winnt_store_registers(
+	const struct regcache *, int regnum,
+	struct winnt_thread *);
+
 void i386_winnt_fetch_registers(
 	struct regcache *, int regnum,
 	struct winnt_thread *);
 
+void i386_winnt_store_registers(
+	const struct regcache *, int regnum,
+	struct winnt_thread *);
+
 #endif
-- 
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