diff options
| author | Kito Cheng <kito.cheng@gmail.com> | 2019-03-16 01:20:46 +0000 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@sifive.com> | 2019-03-19 05:14:39 -0700 |
| commit | 5836c3eccedb6dfab16b8f606f2de24b8938b69c (patch) | |
| tree | 06b0788af46c10271d0d2781acb90a7a8cfebbcf /linux-user | |
| parent | c02b78c7b4cecfe0a027abff8ecc3ec02e8b4a53 (diff) | |
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>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/riscv/cpu_loop.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c index 4cf3e94632..a9bac4ca79 100644 --- a/linux-user/riscv/cpu_loop.c +++ b/linux-user/riscv/cpu_loop.c @@ -18,8 +18,10 @@ */ #include "qemu/osdep.h" +#include "qemu/error-report.h" #include "qemu.h" #include "cpu_loop-common.h" +#include "elf.h" void cpu_loop(CPURISCVState *env) { @@ -53,7 +55,8 @@ void cpu_loop(CPURISCVState *env) ret = 0; } else { ret = do_syscall(env, - env->gpr[xA7], + env->gpr[(env->elf_flags & EF_RISCV_RVE) + ? xT0 : xA7], env->gpr[xA0], env->gpr[xA1], env->gpr[xA2], @@ -113,6 +116,16 @@ void cpu_loop(CPURISCVState *env) void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) { + CPUState *cpu = ENV_GET_CPU(env); + TaskState *ts = cpu->opaque; + struct image_info *info = ts->info; + env->pc = regs->sepc; env->gpr[xSP] = regs->sp; + env->elf_flags = info->elf_flags; + + if ((env->misa & RVE) && !(env->elf_flags & EF_RISCV_RVE)) { + error_report("Incompatible ELF: RVE cpu requires RVE ABI binary"); + exit(EXIT_FAILURE); + } } |