arm64: Emulate SETEND for AArch32 tasks
Emulate deprecated 'setend' instruction for AArch32 bit tasks.
setend [le/be] - Sets the endianness of EL0
On systems with CPUs which support mixed endian at EL0, the hardware
support for the instruction can be enabled by setting the SCTLR_EL1.SED
bit. Like the other emulated instructions it is controlled by an entry in
/proc/sys/abi/. For more information see :
Documentation/arm64/legacy_instructions.txt
The instruction is emulated by setting/clearing the SPSR_EL1.E bit, which
will be reflected in the PSTATE.E in AArch32 context.
This patch also restores the native endianness for the execution of signal
handlers, since the process could have changed the endianness.
Note: All CPUs on the system must have mixed endian support at EL0. Once the
handler is registered, hotplugging a CPU which doesn't support mixed endian,
could lead to unexpected results/behavior in applications.
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/Documentation/arm64/legacy_instructions.txt b/Documentation/arm64/legacy_instructions.txt
index a3b3da2..01bf3d9 100644
--- a/Documentation/arm64/legacy_instructions.txt
+++ b/Documentation/arm64/legacy_instructions.txt
@@ -32,6 +32,9 @@
architecture. Deprecated instructions should default to emulation
while obsolete instructions must be undefined by default.
+Note: Instruction emulation may not be possible in all cases. See
+individual instruction notes for further information.
+
Supported legacy instructions
-----------------------------
* SWP{B}
@@ -43,3 +46,12 @@
Node: /proc/sys/abi/cp15_barrier
Status: Deprecated
Default: Emulate (1)
+
+* SETEND
+Node: /proc/sys/abi/setend
+Status: Deprecated
+Default: Emulate (1)*
+Note: All the cpus on the system must have mixed endian support at EL0
+for this feature to be enabled. If a new CPU - which doesn't support mixed
+endian - is hotplugged in after this feature has been enabled, there could
+be unexpected results in the application.
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b1f9a20..21a59bf 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -540,6 +540,21 @@
If unsure, say Y
+config SETEND_EMULATION
+ bool "Emulate SETEND instruction"
+ help
+ The SETEND instruction alters the data-endianness of the
+ AArch32 EL0, and is deprecated in ARMv8.
+
+ Say Y here to enable software emulation of the instruction
+ for AArch32 userspace code.
+
+ Note: All the cpus on the system must have mixed endian support at EL0
+ for this feature to be enabled. If a new CPU - which doesn't support mixed
+ endian - is hotplugged in after this feature has been enabled, there could
+ be unexpected results in the applications.
+
+ If unsure, say Y
endif
endmenu
diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index 68732e9..a84ec60 100644
--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -82,6 +82,7 @@
(((mmfr0) & ID_AA64MMFR0_BIGEND_MASK) >> ID_AA64MMFR0_BIGEND_SHIFT)
#define SCTLR_EL1_CP15BEN (0x1 << 5)
+#define SCTLR_EL1_SED (0x1 << 8)
#ifndef __ASSEMBLY__
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index 41ed9e1..d6dd9fd 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -58,6 +58,13 @@
#define COMPAT_PSR_Z_BIT 0x40000000
#define COMPAT_PSR_N_BIT 0x80000000
#define COMPAT_PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */
+
+#ifdef CONFIG_CPU_BIG_ENDIAN
+#define COMPAT_PSR_ENDSTATE COMPAT_PSR_E_BIT
+#else
+#define COMPAT_PSR_ENDSTATE 0
+#endif
+
/*
* These are 'magic' values for PTRACE_PEEKUSR that return info about where a
* process is located in memory.
diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
index 68b955e..7922c2e 100644
--- a/arch/arm64/kernel/armv8_deprecated.c
+++ b/arch/arm64/kernel/armv8_deprecated.c
@@ -548,6 +548,79 @@
.set_hw_mode = cp15_barrier_set_hw_mode,
};
+static int setend_set_hw_mode(bool enable)
+{
+ if (!cpu_supports_mixed_endian_el0())
+ return -EINVAL;
+
+ if (enable)
+ config_sctlr_el1(SCTLR_EL1_SED, 0);
+ else
+ config_sctlr_el1(0, SCTLR_EL1_SED);
+ return 0;
+}
+
+static int compat_setend_handler(struct pt_regs *regs, u32 big_endian)
+{
+ char *insn;
+
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, regs->pc);
+
+ if (big_endian) {
+ insn = "setend be";
+ regs->pstate |= COMPAT_PSR_E_BIT;
+ } else {
+ insn = "setend le";
+ regs->pstate &= ~COMPAT_PSR_E_BIT;
+ }
+
+ trace_instruction_emulation(insn, regs->pc);
+ pr_warn_ratelimited("\"%s\" (%ld) uses deprecated setend instruction at 0x%llx\n",
+ current->comm, (unsigned long)current->pid, regs->pc);
+
+ return 0;
+}
+
+static int a32_setend_handler(struct pt_regs *regs, u32 instr)
+{
+ int rc = compat_setend_handler(regs, (instr >> 9) & 1);
+ regs->pc += 4;
+ return rc;
+}
+
+static int t16_setend_handler(struct pt_regs *regs, u32 instr)
+{
+ int rc = compat_setend_handler(regs, (instr >> 3) & 1);
+ regs->pc += 2;
+ return rc;
+}
+
+static struct undef_hook setend_hooks[] = {
+ {
+ .instr_mask = 0xfffffdff,
+ .instr_val = 0xf1010000,
+ .pstate_mask = COMPAT_PSR_MODE_MASK,
+ .pstate_val = COMPAT_PSR_MODE_USR,
+ .fn = a32_setend_handler,
+ },
+ {
+ /* Thumb mode */
+ .instr_mask = 0x0000fff7,
+ .instr_val = 0x0000b650,
+ .pstate_mask = (COMPAT_PSR_T_BIT | COMPAT_PSR_MODE_MASK),
+ .pstate_val = (COMPAT_PSR_T_BIT | COMPAT_PSR_MODE_USR),
+ .fn = t16_setend_handler,
+ },
+ {}
+};
+
+static struct insn_emulation_ops setend_ops = {
+ .name = "setend",
+ .status = INSN_DEPRECATED,
+ .hooks = setend_hooks,
+ .set_hw_mode = setend_set_hw_mode,
+};
+
static int insn_cpu_hotplug_notify(struct notifier_block *b,
unsigned long action, void *hcpu)
{
@@ -573,6 +646,13 @@
if (IS_ENABLED(CONFIG_CP15_BARRIER_EMULATION))
register_insn_emulation(&cp15_barrier_ops);
+ if (IS_ENABLED(CONFIG_SETEND_EMULATION)) {
+ if(system_supports_mixed_endian_el0())
+ register_insn_emulation(&setend_ops);
+ else
+ pr_info("setend instruction emulation is not supported on the system");
+ }
+
register_cpu_notifier(&insn_cpu_hotplug_notifier);
register_insn_emulation_sysctl(ctl_abi);
diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c
index 192d900c..e299de3 100644
--- a/arch/arm64/kernel/signal32.c
+++ b/arch/arm64/kernel/signal32.c
@@ -440,7 +440,7 @@
{
compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler);
compat_ulong_t retcode;
- compat_ulong_t spsr = regs->pstate & ~PSR_f;
+ compat_ulong_t spsr = regs->pstate & ~(PSR_f | COMPAT_PSR_E_BIT);
int thumb;
/* Check if the handler is written for ARM or Thumb */
@@ -454,6 +454,9 @@
/* The IT state must be cleared for both ARM and Thumb-2 */
spsr &= ~COMPAT_PSR_IT_MASK;
+ /* Restore the original endianness */
+ spsr |= COMPAT_PSR_ENDSTATE;
+
if (ka->sa.sa_flags & SA_RESTORER) {
retcode = ptr_to_compat(ka->sa.sa_restorer);
} else {
