From: Stafford Horne <shorne@gmail.com>
To: GCC patches <gcc-patches@gcc.gnu.org>
Cc: Openrisc <openrisc@lists.librecores.org>,
Stafford Horne <shorne@gmail.com>
Subject: [PATCH v2 5/5] or1k: Fixup exception header data encodings
Date: Thu, 14 Jan 2021 08:50:32 +0900 [thread overview]
Message-ID: <20210113235032.2821155-6-shorne@gmail.com> (raw)
In-Reply-To: <20210113235032.2821155-1-shorne@gmail.com>
While running glibc tests several *-textrel tests failed showing that
relocations remained against read only sections. It turned out this was
related to exception headers data encoding being wrong.
By default pointer encoding will always use the DW_EH_PE_absptr format.
This patch uses format DW_EH_PE_pcrel and DW_EH_PE_sdata4. Optionally
DW_EH_PE_indirect is included for global symbols. This eliminates the
relocations.
gcc/ChangeLog:
* config/or1k/or1k.h (ASM_PREFERRED_EH_DATA_FORMAT): New macro.
---
gcc/config/or1k/or1k.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/gcc/config/or1k/or1k.h b/gcc/config/or1k/or1k.h
index b686f1bd159..fe01ab81ead 100644
--- a/gcc/config/or1k/or1k.h
+++ b/gcc/config/or1k/or1k.h
@@ -408,4 +408,8 @@ do { \
((N) < 4 ? HW_TO_GCC_REGNO (25) + (N) : INVALID_REGNUM)
#define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, EH_RETURN_REGNUM)
+/* Select a format to encode pointers in exception handling data. */
+#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
+ (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4)
+
#endif /* GCC_OR1K_H */
--
2.26.2
prev parent reply other threads:[~2021-01-13 23:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-13 23:50 [RESEND PATCH 0/5] OpenRISC GCC Fixes for Glibc Support Stafford Horne
2021-01-13 23:50 ` [PATCH v2 1/5] or1k: Implement profile hook calling _mcount Stafford Horne
2021-01-13 23:50 ` [PATCH v2 2/5] or1k: Add builtin define to detect hard float Stafford Horne
2021-01-13 23:50 ` [PATCH v2 3/5] or1k: Support for softfloat to emulate hw exceptions Stafford Horne
2021-01-13 23:50 ` [PATCH v2 4/5] or1k: Add note to indicate execstack Stafford Horne
2021-01-13 23:50 ` Stafford Horne [this message]
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