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authorPeter Maydell <peter.maydell@linaro.org>2013-12-22 22:32:31 +0000
committerPeter Maydell <peter.maydell@linaro.org>2013-12-23 23:28:24 +0000
commite3ff29bc863f6e16f051da515dcf0fc3fc824901 (patch)
tree63d5c22b87c39037001741de2950b39e1e531a17
parent9188c3556f6c562724341ac756aff9b8bd641ab0 (diff)
downloadqemu-arm-e3ff29bc863f6e16f051da515dcf0fc3fc824901.tar.gz
target-arm: Widen thread-local register state fields to 64 bits
The common pattern for system registers in a 64-bit capable ARM CPU is that when in AArch32 the cp15 register is a view of the bottom 32 bits of the 64-bit AArch64 system register; writes in AArch32 leave the top half unchanged. The most natural way to model this is to have the state field in the CPU struct be a 64 bit value, and simply have the AArch32 TCG code operate on a pointer to its lower half. For aarch64-linux-user the only registers we need to share like this are the thread-local-storage ones. Widen their fields to 64 bits and provide the 64 bit reginfo struct to make them visible in AArch64 state. Note that minor cleanup of the AArch64 system register encoding space means We can share the TPIDR_EL1 reginfo but need split encodings for TPIDR_EL0 and TPIDRRO_EL0. Since we're touching almost every line in QEMU that uses the c13_tls* fields in this patch anyway, we take the opportunity to rename them in line with the standard ARM architectural names for these registers. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>
-rw-r--r--linux-user/aarch64/target_cpu.h5
-rw-r--r--linux-user/arm/target_cpu.h2
-rw-r--r--linux-user/main.c2
-rw-r--r--target-arm/cpu.h18
-rw-r--r--target-arm/helper.c22
5 files changed, 36 insertions, 13 deletions
diff --git a/linux-user/aarch64/target_cpu.h b/linux-user/aarch64/target_cpu.h
index 6f5539b50f..21560ef832 100644
--- a/linux-user/aarch64/target_cpu.h
+++ b/linux-user/aarch64/target_cpu.h
@@ -29,7 +29,10 @@ static inline void cpu_clone_regs(CPUARMState *env, target_ulong newsp)
static inline void cpu_set_tls(CPUARMState *env, target_ulong newtls)
{
- env->sr.tpidr_el0 = newtls;
+ /* Note that AArch64 Linux keeps the TLS pointer in TPIDR; this is
+ * different from AArch32 Linux, which uses TPIDRRO.
+ */
+ env->cp15.tpidr_el0 = newtls;
}
#endif
diff --git a/linux-user/arm/target_cpu.h b/linux-user/arm/target_cpu.h
index ed323c079d..39d65b692b 100644
--- a/linux-user/arm/target_cpu.h
+++ b/linux-user/arm/target_cpu.h
@@ -29,7 +29,7 @@ static inline void cpu_clone_regs(CPUARMState *env, target_ulong newsp)
static inline void cpu_set_tls(CPUARMState *env, target_ulong newtls)
{
- env->cp15.c13_tls2 = newtls;
+ env->cp15.tpidrro_el0 = newtls;
}
#endif
diff --git a/linux-user/main.c b/linux-user/main.c
index 54f71fe8f6..c0df8b5cd4 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -566,7 +566,7 @@ do_kernel_trap(CPUARMState *env)
end_exclusive();
break;
case 0xffff0fe0: /* __kernel_get_tls */
- env->regs[0] = env->cp15.c13_tls2;
+ env->regs[0] = env->cp15.tpidrro_el0;
break;
case 0xffff0f60: /* __kernel_cmpxchg64 */
arm_kernel_cmpxchg64_helper(env);
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 1e0800e9c8..45f897322d 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -66,6 +66,18 @@
/* ARM-specific interrupt pending bits. */
#define CPU_INTERRUPT_FIQ CPU_INTERRUPT_TGT_EXT_1
+/* The usual mapping for an AArch64 system register to its AArch32
+ * counterpart is for the 32 bit world to have access to the lower
+ * half only (with writes leaving the upper half untouched). It's
+ * therefore useful to be able to pass TCG the offset of the least
+ * significant half of a uint64_t struct member.
+ */
+#ifdef HOST_WORDS_BIGENDIAN
+#define offsetoflow32(S, M) (offsetof(S, M + sizeof(uint32_t))
+#else
+#define offsetoflow32(S, M) offsetof(S, M)
+#endif
+
/* Meanings of the ARMCPU object's two inbound GPIO lines */
#define ARM_CPU_IRQ 0
#define ARM_CPU_FIQ 1
@@ -188,9 +200,9 @@ typedef struct CPUARMState {
uint32_t c12_vbar; /* vector base address register */
uint32_t c13_fcse; /* FCSE PID. */
uint32_t c13_context; /* Context ID. */
- uint32_t c13_tls1; /* User RW Thread register. */
- uint32_t c13_tls2; /* User RO Thread register. */
- uint32_t c13_tls3; /* Privileged Thread register. */
+ uint64_t tpidr_el0; /* User RW Thread register. */
+ uint64_t tpidrro_el0; /* User RO Thread register. */
+ uint64_t tpidr_el1; /* Privileged Thread register. */
uint32_t c14_cntfrq; /* Counter Frequency register */
uint32_t c14_cntkctl; /* Timer Control register */
ARMGenericTimer c14_timer[NUM_GTIMERS];
diff --git a/target-arm/helper.c b/target-arm/helper.c
index ca27c8e1ca..0e7ba06060 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -740,18 +740,26 @@ static const ARMCPRegInfo t2ee_cp_reginfo[] = {
};
static const ARMCPRegInfo v6k_cp_reginfo[] = {
+ { .name = "TPIDR_EL0", .state = ARM_CP_STATE_AA64,
+ .opc0 = 3, .opc1 = 3, .opc2 = 2, .crn = 13, .crm = 0,
+ .access = PL0_RW,
+ .fieldoffset = offsetof(CPUARMState, cp15.tpidr_el0), .resetvalue = 0 },
{ .name = "TPIDRURW", .cp = 15, .crn = 13, .crm = 0, .opc1 = 0, .opc2 = 2,
.access = PL0_RW,
- .fieldoffset = offsetof(CPUARMState, cp15.c13_tls1),
- .resetvalue = 0 },
+ .fieldoffset = offsetoflow32(CPUARMState, cp15.tpidr_el0),
+ .resetfn = arm_cp_reset_ignore },
+ { .name = "TPIDRRO_EL0", .state = ARM_CP_STATE_AA64,
+ .opc0 = 3, .opc1 = 3, .opc2 = 3, .crn = 13, .crm = 0,
+ .access = PL0_R|PL1_W,
+ .fieldoffset = offsetof(CPUARMState, cp15.tpidrro_el0), .resetvalue = 0 },
{ .name = "TPIDRURO", .cp = 15, .crn = 13, .crm = 0, .opc1 = 0, .opc2 = 3,
.access = PL0_R|PL1_W,
- .fieldoffset = offsetof(CPUARMState, cp15.c13_tls2),
- .resetvalue = 0 },
- { .name = "TPIDRPRW", .cp = 15, .crn = 13, .crm = 0, .opc1 = 0, .opc2 = 4,
+ .fieldoffset = offsetoflow32(CPUARMState, cp15.tpidrro_el0),
+ .resetfn = arm_cp_reset_ignore },
+ { .name = "TPIDR_EL1", .state = ARM_CP_STATE_BOTH,
+ .opc0 = 3, .opc1 = 0, .opc2 = 4, .crn = 13, .crm = 0,
.access = PL1_RW,
- .fieldoffset = offsetof(CPUARMState, cp15.c13_tls3),
- .resetvalue = 0 },
+ .fieldoffset = offsetof(CPUARMState, cp15.tpidr_el1), .resetvalue = 0 },
REGINFO_SENTINEL
};