diff mbox series

pru: Fixup flags for .pru_irq_map section

Message ID 20211203213348.406058-1-dimitar@dinux.eu
State Committed
Commit dda85bc274e1148a0c576a8cb085bffadd0e54ab
Headers
Series pru: Fixup flags for .pru_irq_map section |

Commit Message

Dimitar Dimitrov Dec. 3, 2021, 9:33 p.m. UTC 
  I intend to merge this patch next week, unless I hear objections.  I
consider it a bug fix which fits the Stage 3 criteria.  It fixes the
RPMSG firmware examples in the latest version 6.0 of TI's PRU Software
Package.

The .pru_irq_map section has been introduced by Linux kernel 5.10:
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c75c9fdac66efd8b54773368254ef330c276171b
This section must not be loaded into target memory.

Binutils already includes the corresponding fix in the linker script:
  https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=44b357eb9aefc77a8385e631d8e3035a664f2333

gcc/ChangeLog:

	* config/pru/pru.c (pru_section_type_flags): New function.
	(TARGET_SECTION_TYPE_FLAGS): Wire it.

gcc/testsuite/ChangeLog:

	* gcc.target/pru/pru_irq_map.c: New test.

Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
---
 gcc/config/pru/pru.c                       | 19 +++++++++++++++++++
 gcc/testsuite/gcc.target/pru/pru_irq_map.c |  8 ++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/pru/pru_irq_map.c

Comments

Dimitar Dimitrov Dec. 8, 2021, 7:21 p.m. UTC | #1 
On Fri, Dec 03, 2021 at 11:33:48PM +0200, Dimitar Dimitrov wrote:
> I intend to merge this patch next week, unless I hear objections.  I
> consider it a bug fix which fits the Stage 3 criteria.  It fixes the
> RPMSG firmware examples in the latest version 6.0 of TI's PRU Software
> Package.
> 
> The .pru_irq_map section has been introduced by Linux kernel 5.10:
>   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c75c9fdac66efd8b54773368254ef330c276171b
> This section must not be loaded into target memory.
> 
> Binutils already includes the corresponding fix in the linker script:
>   https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=44b357eb9aefc77a8385e631d8e3035a664f2333
> 
> gcc/ChangeLog:
> 
> 	* config/pru/pru.c (pru_section_type_flags): New function.
> 	(TARGET_SECTION_TYPE_FLAGS): Wire it.
> 
> gcc/testsuite/ChangeLog:
> 
> 	* gcc.target/pru/pru_irq_map.c: New test.
> 
> Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>


Committed.
diff mbox series

Patch

diff --git a/gcc/config/pru/pru.c b/gcc/config/pru/pru.c
index 9f264b4698d..01d283fd9e7 100644
--- a/gcc/config/pru/pru.c
+++ b/gcc/config/pru/pru.c
@@ -2022,6 +2022,23 @@  pru_assemble_integer (rtx x, unsigned int size, int aligned_p)
     }
 }
 
+/* Implement TARGET_SECTION_TYPE_FLAGS.  */
+
+static unsigned int
+pru_section_type_flags (tree decl, const char *name, int reloc)
+{
+  unsigned int flags = default_section_type_flags (decl, name, reloc);
+
+  /* The .pru_irq_map section is not meant to be loaded into the target
+     memory.  Instead its contents are read by the host remoteproc loader.
+     To prevent being marked as a loadable (allocated) section, the
+     .pru_irq_map section is intercepted and marked as a debug section.  */
+  if (!strcmp (name, ".pru_irq_map"))
+    flags = SECTION_DEBUG | SECTION_RETAIN;
+
+  return flags;
+}
+
 /* Implement TARGET_ASM_FILE_START.  */
 
 static void
@@ -3071,6 +3088,8 @@  pru_unwind_word_mode (void)
 #define TARGET_ASM_FUNCTION_PROLOGUE pru_asm_function_prologue
 #undef TARGET_ASM_INTEGER
 #define TARGET_ASM_INTEGER pru_assemble_integer
+#undef TARGET_SECTION_TYPE_FLAGS
+#define TARGET_SECTION_TYPE_FLAGS pru_section_type_flags
 
 #undef TARGET_ASM_FILE_START
 #define TARGET_ASM_FILE_START pru_file_start
diff --git a/gcc/testsuite/gcc.target/pru/pru_irq_map.c b/gcc/testsuite/gcc.target/pru/pru_irq_map.c
new file mode 100644
index 00000000000..4f9a5e71b01
--- /dev/null
+++ b/gcc/testsuite/gcc.target/pru/pru_irq_map.c
@@ -0,0 +1,8 @@ 
+/* Test the special handling of .pru_irq_map section.  */
+
+/* { dg-do compile } */
+
+int my_int_map __attribute__((section(".pru_irq_map")));
+
+/* Section must not have the allocated flag.  */
+/* { dg-final { scan-assembler "\.section\[ \t\]+.pru_irq_map,\[ \]*\"\",[ ]*@progbits" } } */