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[Qemu-devel] [PATCH 01/11] target-arm: Give CPSR setting on 32-bit excep
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH 01/11] target-arm: Give CPSR setting on 32-bit exception return its own helper |
Date: |
Mon, 15 Feb 2016 17:22:47 +0000 |
The rules for setting the CPSR on a 32-bit exception return are
subtly different from those for setting the CPSR via an instruction
like MSR or CPS. (In particular, in Hyp mode changing the mode bits
is not valid via MSR or CPS.) Split the exception-return case into
its own helper for setting CPSR, so we can eventually handle them
differently in the helper function.
Signed-off-by: Peter Maydell <address@hidden>
---
target-arm/helper.h | 1 +
target-arm/op_helper.c | 6 ++++++
target-arm/translate.c | 6 +++---
3 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/target-arm/helper.h b/target-arm/helper.h
index c98e9ce..ea13202 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -57,6 +57,7 @@ DEF_HELPER_2(pre_smc, void, env, i32)
DEF_HELPER_1(check_breakpoints, void, env)
DEF_HELPER_3(cpsr_write, void, env, i32, i32)
+DEF_HELPER_2(cpsr_write_eret, void, env, i32)
DEF_HELPER_1(cpsr_read, i32, env)
DEF_HELPER_3(v7m_msr, void, env, i32, i32)
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index 538887c..e3ddd5a 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -425,6 +425,12 @@ void HELPER(cpsr_write)(CPUARMState *env, uint32_t val,
uint32_t mask)
cpsr_write(env, val, mask);
}
+/* Write the CPSR for a 32-bit exception return */
+void HELPER(cpsr_write_eret)(CPUARMState *env, uint32_t val)
+{
+ cpsr_write(env, val, CPSR_ERET_MASK);
+}
+
/* Access to user mode registers from privileged modes. */
uint32_t HELPER(get_user_reg)(CPUARMState *env, uint32_t regno)
{
diff --git a/target-arm/translate.c b/target-arm/translate.c
index e69145d..413f7de 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -4094,7 +4094,7 @@ static void gen_exception_return(DisasContext *s,
TCGv_i32 pc)
TCGv_i32 tmp;
store_reg(s, 15, pc);
tmp = load_cpu_field(spsr);
- gen_set_cpsr(tmp, CPSR_ERET_MASK);
+ gen_helper_cpsr_write_eret(cpu_env, tmp);
tcg_temp_free_i32(tmp);
s->is_jmp = DISAS_JUMP;
}
@@ -4102,7 +4102,7 @@ static void gen_exception_return(DisasContext *s,
TCGv_i32 pc)
/* Generate a v6 exception return. Marks both values as dead. */
static void gen_rfe(DisasContext *s, TCGv_i32 pc, TCGv_i32 cpsr)
{
- gen_set_cpsr(cpsr, CPSR_ERET_MASK);
+ gen_helper_cpsr_write_eret(cpu_env, cpsr);
tcg_temp_free_i32(cpsr);
store_reg(s, 15, pc);
s->is_jmp = DISAS_JUMP;
@@ -9094,7 +9094,7 @@ static void disas_arm_insn(DisasContext *s, unsigned int
insn)
if (exc_return) {
/* Restore CPSR from SPSR. */
tmp = load_cpu_field(spsr);
- gen_set_cpsr(tmp, CPSR_ERET_MASK);
+ gen_helper_cpsr_write_eret(cpu_env, tmp);
tcg_temp_free_i32(tmp);
s->is_jmp = DISAS_JUMP;
}
--
1.9.1
- [Qemu-devel] [PATCH 04/11] linux-user: Use restrictive mask when calling cpsr_write(), (continued)
- [Qemu-devel] [PATCH 04/11] linux-user: Use restrictive mask when calling cpsr_write(), Peter Maydell, 2016/02/15
- [Qemu-devel] [PATCH 09/11] target-arm: In v8, make illegal AArch32 mode changes set PSTATE.IL, Peter Maydell, 2016/02/15
- [Qemu-devel] [PATCH 02/11] target-arm: Add write_type argument to cpsr_write(), Peter Maydell, 2016/02/15
- [Qemu-devel] [PATCH 07/11] target-arm: Add Hyp mode checks to bad_mode_switch(), Peter Maydell, 2016/02/15
- [Qemu-devel] [PATCH 05/11] target-arm: In cpsr_write() ignore mode switches from User mode, Peter Maydell, 2016/02/15
- [Qemu-devel] [PATCH 01/11] target-arm: Give CPSR setting on 32-bit exception return its own helper,
Peter Maydell <=
- [Qemu-devel] [PATCH 06/11] target-arm: Add comment about not implementing NSACR.RFR, Peter Maydell, 2016/02/15
- [Qemu-devel] [PATCH 10/11] target-arm: Make mode switches from Hyp via CPS and MRS illegal, Peter Maydell, 2016/02/15
- [Qemu-devel] [PATCH 03/11] target-arm: Raw CPSR writes should skip checks and bank switching, Peter Maydell, 2016/02/15