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-rw-r--r--toolchain/gcc/patches/9.2.0/100-Fix_uninitialised_use_in_mips_split_move.patch55
1 files changed, 55 insertions, 0 deletions
diff --git a/toolchain/gcc/patches/9.2.0/100-Fix_uninitialised_use_in_mips_split_move.patch b/toolchain/gcc/patches/9.2.0/100-Fix_uninitialised_use_in_mips_split_move.patch
new file mode 100644
index 0000000000..3529a19d8c
--- /dev/null
+++ b/toolchain/gcc/patches/9.2.0/100-Fix_uninitialised_use_in_mips_split_move.patch
@@ -0,0 +1,55 @@
+From d57faea9337ad595d005687247c3322252f70ba1 Mon Sep 17 00:00:00 2001
+From: rsandifo <rsandifo@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date: Sun, 7 Jul 2019 09:49:14 +0000
+Subject: [PATCH] Fix uninitialised use in mips_split_move
+
+While testing the fix for PR91068, I hit an rtl checking failure
+while building newlib. mips_split_move was decomposing an address that
+happened to be symbolic and then tried to access the REGNO of the base
+register field, which wasn't initialised but which by chance pointed to
+valid memory.
+
+2019-07-07 Richard Sandiford <richard.sandiford@arm.com>
+
+gcc/
+ * config/mips/mips.c (mips_split_move): Zero-initialize addr
+ and check whether addr.reg is nonnull before using it.
+
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@273174 138bc75d-0d04-0410-961f-82ee72b054a4
+---
+ gcc/ChangeLog | 5 +++++
+ gcc/config/mips/mips.c | 4 ++--
+ 2 files changed, 7 insertions(+), 2 deletions(-)
+
+--- a/gcc/ChangeLog
++++ b/gcc/ChangeLog
+@@ -1,3 +1,8 @@
++2019-07-07 Richard Sandiford <richard.sandiford@arm.com>
++
++ * config/mips/mips.c (mips_split_move): Zero-initialize addr
++ and check whether addr.reg is nonnull before using it.
++
+ 2019-08-12 Release Manager
+
+ * GCC 9.2.0 released.
+--- a/gcc/config/mips/mips.c
++++ b/gcc/config/mips/mips.c
+@@ -4849,7 +4849,7 @@ mips_split_move (rtx dest, rtx src, enum
+ can forward SRC for DEST. This is most useful if the next insn is a
+ simple store. */
+ rtx_insn *insn = (rtx_insn *)insn_;
+- struct mips_address_info addr;
++ struct mips_address_info addr = {};
+ if (insn)
+ {
+ rtx_insn *next = next_nonnote_nondebug_insn_bb (insn);
+@@ -4862,7 +4862,7 @@ mips_split_move (rtx dest, rtx src, enum
+ {
+ rtx tmp = XEXP (src, 0);
+ mips_classify_address (&addr, tmp, GET_MODE (tmp), true);
+- if (REGNO (addr.reg) != REGNO (dest))
++ if (addr.reg && REGNO (addr.reg) != REGNO (dest))
+ validate_change (next, &SET_SRC (set), src, false);
+ }
+ else