diff options
Diffstat (limited to 'recipes-microblaze/gcc/files/gcc-config-microblaze-Make-r21-fixed-due-to-Linux-AB.patch')
| -rw-r--r-- | recipes-microblaze/gcc/files/gcc-config-microblaze-Make-r21-fixed-due-to-Linux-AB.patch | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/recipes-microblaze/gcc/files/gcc-config-microblaze-Make-r21-fixed-due-to-Linux-AB.patch b/recipes-microblaze/gcc/files/gcc-config-microblaze-Make-r21-fixed-due-to-Linux-AB.patch new file mode 100644 index 00000000..373b158a --- /dev/null +++ b/recipes-microblaze/gcc/files/gcc-config-microblaze-Make-r21-fixed-due-to-Linux-AB.patch @@ -0,0 +1,48 @@ +From 3a73b9abccefa81cdee4cdf28f8b3b8fb0ed6c6e Mon Sep 17 00:00:00 2001 +From: Nathan Rossi <nathan@nathanrossi.com> +Date: Tue, 27 Sep 2016 04:14:50 +1000 +Subject: [PATCH] gcc/config/microblaze: Make r21 fixed due to Linux ABI + +Commit 6dcad60c0ef48af584395a40feeb256fb82986a8 introduced a change to +how the r20 and r21 registers are handled for MicroBlaze. Specifically +removing the fixed nature of the r21 register. + +In the Linux ABI the r21 register is reserved as a fixed register for +the purposes of storing a pointer to the thread related object. This is +of particular importance for libc (glibc and musl) which use this +register and expect it to be fixed for this purpose. + +GCC uses the r20 register for GOT pointing. This commit mentioned above +confusingly states it preserved the fixed nature but in fact changes r20 +to be non-fixed. This patch fixes that up. + +Signed-off-by: Nathan Rossi <nathan@nathanrossi.com> +Upstream-Status: Pending +--- + gcc/config/microblaze/microblaze.h | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +diff --git a/gcc/config/microblaze/microblaze.h b/gcc/config/microblaze/microblaze.h +index dbfb6522c7..e115c42839 100644 +--- a/gcc/config/microblaze/microblaze.h ++++ b/gcc/config/microblaze/microblaze.h +@@ -253,14 +253,14 @@ extern enum pipeline_type microblaze_pipe; + #define FIXED_REGISTERS \ + { \ + 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, \ +- 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ ++ 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ + 1, 1, 1, 1 \ + } + + #define CALL_USED_REGISTERS \ + { \ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ +- 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ ++ 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ + 1, 1, 1, 1 \ + } + #define GP_REG_FIRST 0 +-- +2.9.3 + |