[openwrt/openwrt] toolchain/gcc: merge pending fix for miscompiled MIPS16 code issue (GCC PR 84790)

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/16cec7ae67d9a1e88cb30b45f45596ba753b2afa

commit 16cec7ae67d9a1e88cb30b45f45596ba753b2afa
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Mar 12 10:28:03 2018 +0100

    toolchain/gcc: merge pending fix for miscompiled MIPS16 code issue (GCC PR 84790)
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 .../gcc/patches/7.3.0/110-Fix-MIPS-PR-84790.patch    | 20 ++++++++++++++++++++
 .../7.3.0/300-mips_Os_cpu_rtx_cost_model.patch       |  2 +-
 .../gcc/patches/7.3.0/930-fix-mips-noexecstack.patch |  2 +-
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/toolchain/gcc/patches/7.3.0/110-Fix-MIPS-PR-84790.patch b/toolchain/gcc/patches/7.3.0/110-Fix-MIPS-PR-84790.patch
new file mode 100644
index 0000000..643c5e6
--- /dev/null
+++ b/toolchain/gcc/patches/7.3.0/110-Fix-MIPS-PR-84790.patch
@@ -0,0 +1,20 @@
+Fix https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84790.
+MIPS16 functions have a static assembler prologue which clobbers
+registers v0 and v1. Add these register clobbers to function call
+instructions.
+
+--- a/gcc/config/mips/mips.c
++++ b/gcc/config/mips/mips.c
+@@ -3098,6 +3098,12 @@ mips_emit_call_insn (rtx pattern, rtx or
+       emit_insn (gen_update_got_version ());
+     }
+ 
++  if (TARGET_MIPS16 && TARGET_USE_GOT)
++    {
++      clobber_reg (&CALL_INSN_FUNCTION_USAGE (insn), MIPS16_PIC_TEMP);
++      clobber_reg (&CALL_INSN_FUNCTION_USAGE (insn), MIPS_PROLOGUE_TEMP (word_mode));
++    }
++
+   if (TARGET_MIPS16
+       && TARGET_EXPLICIT_RELOCS
+       && TARGET_CALL_CLOBBERED_GP)
diff --git a/toolchain/gcc/patches/7.3.0/300-mips_Os_cpu_rtx_cost_model.patch b/toolchain/gcc/patches/7.3.0/300-mips_Os_cpu_rtx_cost_model.patch
index 84c0fda..2d0ae46 100644
--- a/toolchain/gcc/patches/7.3.0/300-mips_Os_cpu_rtx_cost_model.patch
+++ b/toolchain/gcc/patches/7.3.0/300-mips_Os_cpu_rtx_cost_model.patch
@@ -10,7 +10,7 @@ Signed-off-by: Felix Fietkau <nbd at nbd.name>
 
 --- a/gcc/config/mips/mips.c
 +++ b/gcc/config/mips/mips.c
-@@ -19784,7 +19784,7 @@ mips_option_override (void)
+@@ -19790,7 +19790,7 @@ mips_option_override (void)
      flag_pcc_struct_return = 0;
  
    /* Decide which rtx_costs structure to use.  */
diff --git a/toolchain/gcc/patches/7.3.0/930-fix-mips-noexecstack.patch b/toolchain/gcc/patches/7.3.0/930-fix-mips-noexecstack.patch
index 90d10f1..5affd6f 100644
--- a/toolchain/gcc/patches/7.3.0/930-fix-mips-noexecstack.patch
+++ b/toolchain/gcc/patches/7.3.0/930-fix-mips-noexecstack.patch
@@ -48,7 +48,7 @@ sellcey at mips.com
 
 --- a/gcc/config/mips/mips.c
 +++ b/gcc/config/mips/mips.c
-@@ -22561,6 +22561,9 @@ mips_promote_function_mode (const_tree t
+@@ -22567,6 +22567,9 @@ mips_promote_function_mode (const_tree t
  #undef TARGET_CUSTOM_FUNCTION_DESCRIPTORS
  #define TARGET_CUSTOM_FUNCTION_DESCRIPTORS 2