From 886f467a7523fd1dc80b616387e2c3d082afba6f Mon Sep 17 00:00:00 2001
From: Robin Randhawa <robin.randhawa@arm.com>
Date: Mon, 18 Jan 2021 22:01:32 +0000
Subject: [PATCH] aarch64: TLS arch_read implementation
---
src/ld_so/tcb.rs | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/src/ld_so/tcb.rs b/src/ld_so/tcb.rs
index 923a40ca..0493f303 100644
--- a/src/ld_so/tcb.rs
+++ b/src/ld_so/tcb.rs
@@ -208,8 +208,20 @@ impl Tcb {
#[inline(always)]
#[cfg(target_arch = "aarch64")]
unsafe fn arch_read(offset: usize) -> usize {
- //TODO: aarch64
- unimplemented!("arch_read not implemented on aarch64");
+ let mut value = 0usize;
+ let mut tmp = 0usize;
+
+ llvm_asm!("
+ mrs $0, tpidr_el0
+ add $0, $0, $2
+ ldr $1, [$0]
+ "
+ : "=r"(tmp), "=r"(value)
+ : "r"(offset)
+ :
+ : "volatile"
+ );
+ value
}
/// Architecture specific code to read a usize from the TCB - x86_64
--
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