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RISC-V: linux-user support for RVE ABI

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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>
This commit is contained in:
Kito Cheng 2019-03-16 01:20:46 +00:00 • committed by Palmer Dabbelt
parent c02b78c7b4
commit 5836c3ecce
No known key found for this signature in database
GPG key ID: EF4CA1502CCBAB41
3 changed files with 20 additions and 2 deletions
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3
target/riscv/cpu_user.h
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@ -10,4 +10,5 @@
#define xA4 14
#define xA5 15
#define xA6 16
#define xA7 17 /* syscall number goes here */
#define xA7 17 /* syscall number for RVI ABI */
#define xT0 5 /* syscall number for RVE ABI */