main/musl: backport patch fixing TLS layout

This issue affects e.g. Rust on aarch64.

2 files changed, 297 insertions, 1 deletions

diff --git a/main/musl/APKBUILD b/main/musl/APKBUILD
index cd67b11c11..796c4ae84d 100644
--- a/main/musl/APKBUILD
+++ b/main/musl/APKBUILD
@@ -2,7 +2,7 @@
 # Maintainer: Timo Teräs <timo.teras@iki.fi>
 pkgname=musl
 pkgver=1.1.19
-pkgrel=9
+pkgrel=10
 pkgdesc="the musl c library (libc) implementation"
 url="http://www.musl-libc.org/"
 arch="all"
@@ -24,6 +24,8 @@ source="http://www.musl-libc.org/releases/musl-$pkgver.tar.gz
         2000-pthread-internals-increase-DEFAULT_GUARD_SIZE-to-2-p.patch
         handle-aux-at_base.patch
 
+        fix-TLS-layout-of-TLS-variant-I-when-there-is-gap-above-TP.patch
+
         ldconfig
         __stack_chk_fail_local.c
         getconf.c
@@ -155,6 +157,7 @@ b0bcfc837f888f2b1c2d65c06dcc0a2fa12da78986ba9c7c86a64123ce44c21a63c13c1cc2e93fdf
 023fc05d653f4a3be4d16a2e223bddc26be7bc31c4decf3f5b9bed78cbe7bc8687ff8c164b94541f6fda66d6c3864dd42cb10920d066f97d2891e31a366c3e8d  0006-powerpc-update-hwcap.h-for-linux-v4.15.patch
 2c8e1dde1834238097b2ee8a7bfb53471a0d9cff4a5e38b55f048b567deff1cdd47c170d0578a67b1a039f95a6c5fbb8cff369c75b6a3e4d7ed171e8e86ebb8c  2000-pthread-internals-increase-DEFAULT_GUARD_SIZE-to-2-p.patch
 6a7ff16d95b5d1be77e0a0fbb245491817db192176496a57b22ab037637d97a185ea0b0d19da687da66c2a2f5578e4343d230f399d49fe377d8f008410974238  handle-aux-at_base.patch
+898507a75af05d960ac25343ac1ff026923a62f5095400fa3dcc650baf25b83cdff740da8a87fa6e40856227a44dcc469b78af6905e2f0e4f027abef5d3fad57  fix-TLS-layout-of-TLS-variant-I-when-there-is-gap-above-TP.patch
 8d3a2d5315fc56fee7da9abb8b89bb38c6046c33d154c10d168fb35bfde6b0cf9f13042a3bceee34daf091bc409d699223735dcf19f382eeee1f6be34154f26f  ldconfig
 062bb49fa54839010acd4af113e20f7263dde1c8a2ca359b5fb2661ef9ed9d84a0f7c3bc10c25dcfa10bb3c5a4874588dff636ac43d5dbb3d748d75400756d0b  __stack_chk_fail_local.c
 0d80f37b34a35e3d14b012257c50862dfeb9d2c81139ea2dfa101d981d093b009b9fa450ba27a708ac59377a48626971dfc58e20a3799084a65777a0c32cbc7d  getconf.c
diff --git a/main/musl/fix-TLS-layout-of-TLS-variant-I-when-there-is-gap-above-TP.patch b/main/musl/fix-TLS-layout-of-TLS-variant-I-when-there-is-gap-above-TP.patch
new file mode 100644
index 0000000000..ce82a6fd28
--- /dev/null
+++ b/main/musl/fix-TLS-layout-of-TLS-variant-I-when-there-is-gap-above-TP.patch
@@ -0,0 +1,293 @@
+From 610c5a8524c3d6cd3ac5a5f1231422e7648a3791 Mon Sep 17 00:00:00 2001
+From: Szabolcs Nagy <nsz@port70.net>
+Date: Sat, 2 Jun 2018 01:52:01 +0200
+Subject: fix TLS layout of TLS variant I when there is a gap above TP
+
+In TLS variant I the TLS is above TP (or above a fixed offset from TP)
+but on some targets there is a reserved gap above TP before TLS starts.
+
+This matters for the local-exec tls access model when the offsets of
+TLS variables from the TP are hard coded by the linker into the
+executable, so the libc must compute these offsets the same way as the
+linker.  The tls offset of the main module has to be
+
+        alignup(GAP_ABOVE_TP, main_tls_align).
+
+If there is no TLS in the main module then the gap can be ignored
+since musl does not use it and the tls access models of shared
+libraries are not affected.
+
+The previous setup only worked if (tls_align & -GAP_ABOVE_TP) == 0
+(i.e. TLS did not require large alignment) because the gap was
+treated as a fixed offset from TP.  Now the TP points at the end
+of the pthread struct (which is aligned) and there is a gap above
+it (which may also need alignment).
+
+The fix required changing TP_ADJ and __pthread_self on affected
+targets (aarch64, arm and sh) and in the tlsdesc asm the offset to
+access the dtv changed too.
+
+Patch-Source: https://git.musl-libc.org/cgit/musl/commit/?id=610c5a8524c3d6cd3ac5a5f1231422e7648a3791
+See-Also: https://github.com/rust-lang/rust/issues/48967
+---
+ arch/aarch64/pthread_arch.h   |  5 +++--
+ arch/aarch64/reloc.h          |  2 +-
+ arch/arm/pthread_arch.h       |  7 ++++---
+ arch/arm/reloc.h              |  2 +-
+ arch/mips/pthread_arch.h      |  1 +
+ arch/mips64/pthread_arch.h    |  1 +
+ arch/mipsn32/pthread_arch.h   |  1 +
+ arch/or1k/pthread_arch.h      |  1 +
+ arch/powerpc/pthread_arch.h   |  1 +
+ arch/powerpc64/pthread_arch.h |  1 +
+ arch/sh/pthread_arch.h        |  5 +++--
+ arch/sh/reloc.h               |  2 +-
+ ldso/dynlink.c                |  5 +++--
+ src/env/__init_tls.c          | 10 ++++++++--
+ src/ldso/aarch64/tlsdesc.s    |  5 ++---
+ 15 files changed, 32 insertions(+), 17 deletions(-)
+
+diff --git a/arch/aarch64/pthread_arch.h b/arch/aarch64/pthread_arch.h
+index b2e2d8f..e8499d8 100644
+--- a/arch/aarch64/pthread_arch.h
++++ b/arch/aarch64/pthread_arch.h
+@@ -2,10 +2,11 @@ static inline struct pthread *__pthread_self()
+ {
+        char *self;
+        __asm__ __volatile__ ("mrs %0,tpidr_el0" : "=r"(self));
+-       return (void*)(self + 16 - sizeof(struct pthread));
++       return (void*)(self - sizeof(struct pthread));
+ }
+ 
+ #define TLS_ABOVE_TP
+-#define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) - 16)
++#define GAP_ABOVE_TP 16
++#define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread))
+ 
+ #define MC_PC pc
+diff --git a/arch/aarch64/reloc.h b/arch/aarch64/reloc.h
+index 51b66e2..40cf0b2 100644
+--- a/arch/aarch64/reloc.h
++++ b/arch/aarch64/reloc.h
+@@ -10,7 +10,7 @@
+ 
+ #define NO_LEGACY_INITFINI
+ 
+-#define TPOFF_K 16
++#define TPOFF_K 0
+ 
+ #define REL_SYMBOLIC    R_AARCH64_ABS64
+ #define REL_GOT         R_AARCH64_GLOB_DAT
+diff --git a/arch/arm/pthread_arch.h b/arch/arm/pthread_arch.h
+index 6657e19..8f2ae8f 100644
+--- a/arch/arm/pthread_arch.h
++++ b/arch/arm/pthread_arch.h
+@@ -5,7 +5,7 @@ static inline pthread_t __pthread_self()
+ {
+        char *p;
+        __asm__ __volatile__ ( "mrc p15,0,%0,c13,c0,3" : "=r"(p) );
+-       return (void *)(p+8-sizeof(struct pthread));
++       return (void *)(p-sizeof(struct pthread));
+ }
+ 
+ #else
+@@ -21,12 +21,13 @@ static inline pthread_t __pthread_self()
+        extern uintptr_t __attribute__((__visibility__("hidden"))) __a_gettp_ptr;
+        register uintptr_t p __asm__("r0");
+        __asm__ __volatile__ ( BLX " %1" : "=r"(p) : "r"(__a_gettp_ptr) : "cc", "lr" );
+-       return (void *)(p+8-sizeof(struct pthread));
++       return (void *)(p-sizeof(struct pthread));
+ }
+ 
+ #endif
+ 
+ #define TLS_ABOVE_TP
+-#define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) - 8)
++#define GAP_ABOVE_TP 8
++#define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread))
+ 
+ #define MC_PC arm_pc
+diff --git a/arch/arm/reloc.h b/arch/arm/reloc.h
+index b175711..4b00bf6 100644
+--- a/arch/arm/reloc.h
++++ b/arch/arm/reloc.h
+@@ -16,7 +16,7 @@
+ 
+ #define NO_LEGACY_INITFINI
+ 
+-#define TPOFF_K 8
++#define TPOFF_K 0
+ 
+ #define REL_SYMBOLIC    R_ARM_ABS32
+ #define REL_GOT         R_ARM_GLOB_DAT
+diff --git a/arch/mips/pthread_arch.h b/arch/mips/pthread_arch.h
+index e581265..5fea15a 100644
+--- a/arch/mips/pthread_arch.h
++++ b/arch/mips/pthread_arch.h
+@@ -11,6 +11,7 @@ static inline struct pthread *__pthread_self()
+ }
+ 
+ #define TLS_ABOVE_TP
++#define GAP_ABOVE_TP 0
+ #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
+ 
+ #define DTP_OFFSET 0x8000
+diff --git a/arch/mips64/pthread_arch.h b/arch/mips64/pthread_arch.h
+index e581265..5fea15a 100644
+--- a/arch/mips64/pthread_arch.h
++++ b/arch/mips64/pthread_arch.h
+@@ -11,6 +11,7 @@ static inline struct pthread *__pthread_self()
+ }
+ 
+ #define TLS_ABOVE_TP
++#define GAP_ABOVE_TP 0
+ #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
+ 
+ #define DTP_OFFSET 0x8000
+diff --git a/arch/mipsn32/pthread_arch.h b/arch/mipsn32/pthread_arch.h
+index e581265..5fea15a 100644
+--- a/arch/mipsn32/pthread_arch.h
++++ b/arch/mipsn32/pthread_arch.h
+@@ -11,6 +11,7 @@ static inline struct pthread *__pthread_self()
+ }
+ 
+ #define TLS_ABOVE_TP
++#define GAP_ABOVE_TP 0
+ #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
+ 
+ #define DTP_OFFSET 0x8000
+diff --git a/arch/or1k/pthread_arch.h b/arch/or1k/pthread_arch.h
+index 7decd76..521b9c5 100644
+--- a/arch/or1k/pthread_arch.h
++++ b/arch/or1k/pthread_arch.h
+@@ -12,6 +12,7 @@ static inline struct pthread *__pthread_self()
+ }
+ 
+ #define TLS_ABOVE_TP
++#define GAP_ABOVE_TP 0
+ #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread))
+ 
+ #define MC_PC regs.pc
+diff --git a/arch/powerpc/pthread_arch.h b/arch/powerpc/pthread_arch.h
+index 7c5c4fa..79e5a09 100644
+--- a/arch/powerpc/pthread_arch.h
++++ b/arch/powerpc/pthread_arch.h
+@@ -11,6 +11,7 @@ static inline struct pthread *__pthread_self()
+ }
+                         
+ #define TLS_ABOVE_TP
++#define GAP_ABOVE_TP 0
+ #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
+ 
+ #define DTP_OFFSET 0x8000
+diff --git a/arch/powerpc64/pthread_arch.h b/arch/powerpc64/pthread_arch.h
+index 2f976fe..37b75e2 100644
+--- a/arch/powerpc64/pthread_arch.h
++++ b/arch/powerpc64/pthread_arch.h
+@@ -6,6 +6,7 @@ static inline struct pthread *__pthread_self()
+ }
+ 
+ #define TLS_ABOVE_TP
++#define GAP_ABOVE_TP 0
+ #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
+ 
+ #define DTP_OFFSET 0x8000
+diff --git a/arch/sh/pthread_arch.h b/arch/sh/pthread_arch.h
+index 2756e7e..41fefac 100644
+--- a/arch/sh/pthread_arch.h
++++ b/arch/sh/pthread_arch.h
+@@ -2,10 +2,11 @@ static inline struct pthread *__pthread_self()
+ {
+        char *self;
+        __asm__ __volatile__ ("stc gbr,%0" : "=r" (self) );
+-       return (struct pthread *) (self + 8 - sizeof(struct pthread));
++       return (struct pthread *) (self - sizeof(struct pthread));
+ }
+ 
+ #define TLS_ABOVE_TP
+-#define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) - 8)
++#define GAP_ABOVE_TP 8
++#define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread))
+ 
+ #define MC_PC sc_pc
+diff --git a/arch/sh/reloc.h b/arch/sh/reloc.h
+index 0238ce0..a1f16cb 100644
+--- a/arch/sh/reloc.h
++++ b/arch/sh/reloc.h
+@@ -20,7 +20,7 @@
+ 
+ #define LDSO_ARCH "sh" ENDIAN_SUFFIX FP_SUFFIX ABI_SUFFIX
+ 
+-#define TPOFF_K 8
++#define TPOFF_K 0
+ 
+ #define REL_SYMBOLIC    R_SH_DIR32
+ #define REL_OFFSET      R_SH_REL32
+diff --git a/ldso/dynlink.c b/ldso/dynlink.c
+index cea5f45..c6216b7 100644
+--- a/ldso/dynlink.c
++++ b/ldso/dynlink.c
+@@ -1594,8 +1594,9 @@ _Noreturn void __dls3(size_t *sp)
+                libc.tls_head = tls_tail = &app.tls;
+                app.tls_id = tls_cnt = 1;
+ #ifdef TLS_ABOVE_TP
+-               app.tls.offset = 0;
+-               tls_offset = app.tls.size
++               app.tls.offset = GAP_ABOVE_TP;
++               app.tls.offset += -GAP_ABOVE_TP & (app.tls.align-1);
++               tls_offset = app.tls.offset + app.tls.size
+                        + ( -((uintptr_t)app.tls.image + app.tls.size)
+                        & (app.tls.align-1) );
+ #else
+diff --git a/src/env/__init_tls.c b/src/env/__init_tls.c
+index 1c5d98a..31d324a 100644
+--- a/src/env/__init_tls.c
++++ b/src/env/__init_tls.c
+@@ -104,13 +104,19 @@ static void static_init_tls(size_t *aux)
+ 
+        main_tls.size += (-main_tls.size - (uintptr_t)main_tls.image)
+                & (main_tls.align-1);
+-       if (main_tls.align < MIN_TLS_ALIGN) main_tls.align = MIN_TLS_ALIGN;
+-#ifndef TLS_ABOVE_TP
++#ifdef TLS_ABOVE_TP
++       main_tls.offset = GAP_ABOVE_TP;
++       main_tls.offset += -GAP_ABOVE_TP & (main_tls.align-1);
++#else
+        main_tls.offset = main_tls.size;
+ #endif
++       if (main_tls.align < MIN_TLS_ALIGN) main_tls.align = MIN_TLS_ALIGN;
+ 
+        libc.tls_align = main_tls.align;
+        libc.tls_size = 2*sizeof(void *) + sizeof(struct pthread)
++#ifdef TLS_ABOVE_TP
++               + main_tls.offset
++#endif
+                + main_tls.size + main_tls.align
+                + MIN_TLS_ALIGN-1 & -MIN_TLS_ALIGN;
+ 
+diff --git a/src/ldso/aarch64/tlsdesc.s b/src/ldso/aarch64/tlsdesc.s
+index 8ed5c26..8e4004d 100644
+--- a/src/ldso/aarch64/tlsdesc.s
++++ b/src/ldso/aarch64/tlsdesc.s
+@@ -14,7 +14,7 @@ __tlsdesc_static:
+ // size_t __tlsdesc_dynamic(size_t *a)
+ // {
+ //     struct {size_t modidx,off;} *p = (void*)a[1];
+-//     size_t *dtv = *(size_t**)(tp + 16 - 8);
++//     size_t *dtv = *(size_t**)(tp - 8);
+ //     if (p->modidx <= dtv[0])
+ //             return dtv[p->modidx] + p->off - tp;
+ //     return __tls_get_new(p) - tp;
+@@ -28,8 +28,7 @@ __tlsdesc_dynamic:
+        mrs x1,tpidr_el0      // tp
+        ldr x0,[x0,#8]        // p
+        ldr x2,[x0]           // p->modidx
+-       add x3,x1,#8
+-       ldr x3,[x3]           // dtv
++       ldr x3,[x1,#-8]       // dtv
+        ldr x4,[x3]           // dtv[0]
+        cmp x2,x4
+        b.hi 1f
+-- 
+cgit v0.11.2
+