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From: KONRAD Frederic <frederic.konrad@adacore.com>
To: qemu-devel@nongnu.org
Cc: "open list:RISC-V TCG CPUs" <qemu-riscv@nongnu.org>,
	Sagar Karandikar <sagark@eecs.berkeley.edu>,
	Bastian Koppelmann <kbastian@mail.uni-paderborn.de>,
	Palmer Dabbelt <palmer@sifive.com>,
	KONRAD Frederic <frederic.konrad@adacore.com>,
	Alistair Francis <Alistair.Francis@wdc.com>
Subject: [Qemu-devel] [PATCH v1] gdbstub: riscv: fix the fflags registers
Date: Tue, 10 Sep 2019 10:15:41 +0200
Message-ID: <1568103341-28636-1-git-send-email-frederic.konrad@adacore.com> (raw)

While debugging an application with GDB the following might happen:

(gdb) return
Make xxx return now? (y or n) y
Could not fetch register "fflags"; remote failure reply 'E14'

This is because riscv_gdb_get_fpu calls riscv_csrrw_debug with a wrong csr
number (8). It should use the csr_register_map in order to reach the
riscv_cpu_get_fflags callback.

Signed-off-by: KONRAD Frederic <frederic.konrad@adacore.com>
---
 target/riscv/gdbstub.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/target/riscv/gdbstub.c b/target/riscv/gdbstub.c
index 27be932..ded140e 100644
--- a/target/riscv/gdbstub.c
+++ b/target/riscv/gdbstub.c
@@ -313,7 +313,8 @@ static int riscv_gdb_get_fpu(CPURISCVState *env, uint8_t *mem_buf, int n)
          * register 33, so we recalculate the map index.
          * This also works for CSR_FRM and CSR_FCSR.
          */
-        result = riscv_csrrw_debug(env, n - 33 +  8, &val, 0, 0);
+        result = riscv_csrrw_debug(env, n - 33 + csr_register_map[8], &val,
+                                   0, 0);
         if (result == 0) {
             return gdb_get_regl(mem_buf, val);
         }
@@ -335,7 +336,8 @@ static int riscv_gdb_set_fpu(CPURISCVState *env, uint8_t *mem_buf, int n)
          * register 33, so we recalculate the map index.
          * This also works for CSR_FRM and CSR_FCSR.
          */
-        result = riscv_csrrw_debug(env, n - 33 + 8, NULL, val, -1);
+        result = riscv_csrrw_debug(env, n - 33 + csr_register_map[8], NULL,
+                                   val, -1);
         if (result == 0) {
             return sizeof(target_ulong);
         }
-- 
1.8.3.1



             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-10  8:15 KONRAD Frederic [this message]
2019-09-13 21:20 ` Palmer Dabbelt
2019-09-16 21:29 ` Alistair Francis

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