From 5836c3eccedb6dfab16b8f606f2de24b8938b69c Mon Sep 17 00:00:00 2001
From: Kito Cheng <kito.cheng@gmail.com>
Date: Sat, 16 Mar 2019 01:20:46 +0000
Subject: RISC-V: linux-user support for RVE ABI

This change checks elf_flags for EF_RISCV_RVE and if
present uses the RVE linux syscall ABI which uses t0
for the syscall number instead of a7.

Warn and exit if a non-RVE ABI binary is run on a
cpu with the RVE extension as it is incompatible.

Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Sagar Karandikar <sagark@eecs.berkeley.edu>
Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Cc: Alistair Francis <Alistair.Francis@wdc.com>
Co-authored-by: Kito Cheng <kito.cheng@gmail.com>
Co-authored-by: Michael Clark <mjc@sifive.com>
Signed-off-by: Michael Clark <mjc@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
---
 target/riscv/cpu.h | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'target/riscv/cpu.h')

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index df43a0898d..20bce8742e 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -123,6 +123,10 @@ struct CPURISCVState {
 
     uint32_t features;
 
+#ifdef CONFIG_USER_ONLY
+    uint32_t elf_flags;
+#endif
+
 #ifndef CONFIG_USER_ONLY
     target_ulong priv;
     target_ulong resetvec;
-- 
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