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[Stable-8.2.8 35/49] target/riscv/csr.c: Fix an access to VXSAT
From: |
Michael Tokarev |
Subject: |
[Stable-8.2.8 35/49] target/riscv/csr.c: Fix an access to VXSAT |
Date: |
Sat, 9 Nov 2024 13:14:26 +0300 |
From: Evgenii Prokopiev <evgenii.prokopiev@syntacore.com>
The register VXSAT should be RW only to the first bit.
The remaining bits should be 0.
The RISC-V Instruction Set Manual Volume I: Unprivileged Architecture
The vxsat CSR has a single read-write least-significant bit (vxsat[0])
that indicates if a fixed-point instruction has had to saturate an output
value to fit into a destination format. Bits vxsat[XLEN-1:1]
should be written as zeros.
Signed-off-by: Evgenii Prokopiev <evgenii.prokopiev@syntacore.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20241002084436.89347-1-evgenii.prokopiev@syntacore.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
(cherry picked from commit 5a60026cad4e9dba929cab4f63229e4b9110cf0a)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index c50a33397c..3d9ea0c316 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -704,7 +704,7 @@ static RISCVException write_vxrm(CPURISCVState *env, int
csrno,
static RISCVException read_vxsat(CPURISCVState *env, int csrno,
target_ulong *val)
{
- *val = env->vxsat;
+ *val = env->vxsat & BIT(0);
return RISCV_EXCP_NONE;
}
@@ -714,7 +714,7 @@ static RISCVException write_vxsat(CPURISCVState *env, int
csrno,
#if !defined(CONFIG_USER_ONLY)
env->mstatus |= MSTATUS_VS;
#endif
- env->vxsat = val;
+ env->vxsat = val & BIT(0);
return RISCV_EXCP_NONE;
}
--
2.39.5
- [Stable-8.2.8 33/49] target/arm: Don't assert in regime_is_user() for E10 mmuidx values, (continued)
- [Stable-8.2.8 33/49] target/arm: Don't assert in regime_is_user() for E10 mmuidx values, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 11/49] tcg/ppc: Use TCG_REG_TMP2 for scratch tcg_out_qemu_st, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 26/49] linux-user/ppc: Fix sigmask endianness issue in sigreturn, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 32/49] net/tap-win32: Fix gcc 14 format truncation errors, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 21/49] raw-format: Fix error message for invalid offset/size, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 22/49] tcg: Reset data_gen_ptr correctly, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 24/49] target/i386: Use probe_access_full_mmu in ptw_translate, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 25/49] linux-user: Emulate /proc/self/maps under mmap_lock, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 27/49] vfio/migration: Report only stop-copy size in vfio_state_pending_exact(), Michael Tokarev, 2024/11/09
- [Stable-8.2.8 38/49] target/riscv: Set vtype.vill on CPU reset, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 35/49] target/riscv/csr.c: Fix an access to VXSAT,
Michael Tokarev <=
- [Stable-8.2.8 23/49] target/i386: Walk NPT in guest real mode, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 30/49] Fix calculation of minimum in colo_compare_tcp, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 34/49] target/arm: Fix arithmetic underflow in SETM instruction, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 31/49] net: fix build when libbpf is disabled, but libxdp is enabled, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 36/49] target/riscv: Correct SXL return value for RV32 in RV64 QEMU, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 40/49] hw/intc/riscv_aplic: Check and update pending when write sourcecfg, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 39/49] hw/intc/riscv_aplic: Fix in_clrip[x] read emulation, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 37/49] hw/intc: Don't clear pending bits on IRQ lowering, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 47/49] migration: Ensure vmstate_save() sets errp, Michael Tokarev, 2024/11/09
- [Stable-8.2.8 29/49] dockerfiles: fix default targets for debian-loongarch-cross, Michael Tokarev, 2024/11/09