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Message-ID: <584AB057.5050605@arm.com> Date: Fri, 9 Dec 2016 13:23:35 +0000 From: Szabolcs Nagy User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0 MIME-Version: 1.0 To: GNU C Library CC: , Marcus Shawcroft , Florian Weimer Subject: [PATCH][AArch64] Add more cfi annotations to tlsdesc entry points X-ClientProxiedBy: HE1PR0701CA0061.eurprd07.prod.outlook.com (10.168.191.29) To HE1PR0802MB2491.eurprd08.prod.outlook.com (10.175.31.151) X-MS-Office365-Filtering-Correlation-Id: af077cb8-6fde-417a-ade6-08d4203696b0 X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(22001); SRVR:HE1PR0802MB2491; X-Microsoft-Exchange-Diagnostics: 1; HE1PR0802MB2491; 3:aC1geHO40Zjcrx/fdp+uDdNpP0puFl9X/ZjI58Y7uC6GpKe8jYUzy8RfCRswkpIwy2EmawaQsK/Da2sgBKHGQWwcKmyOK4xel3XBn5oboeKsngwX/hoQsh/PatgVHWvhSEWrtptJNqGlC61finvYvjksfPyJu3G2lw+acrRGrzN7RxseCcEl8njLmE3wxI7Fun1y9y/YHQe6T5AgCkKWoNl5170y2U8+ANqbnFtXGL1icembTtZJCR8TRZ6mfConw+yGj7JHak6LuC2tUziG2A== X-Microsoft-Exchange-Diagnostics: 1; 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Add enough annotation so backtracing from the dynamic linker through tlsdesc entry points works and the debugger shows registers correctly. (manually tested with gdb.) 2016-12-09 Szabolcs Nagy * sysdeps/aarch64/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Add cfi annotation. (_dl_tlsdesc_resolve_rela, _dl_tlsdesc_resolve_hold): Likewise. diff --git a/sysdeps/aarch64/dl-tlsdesc.S b/sysdeps/aarch64/dl-tlsdesc.S index 9e557dd..40a19d4 100644 --- a/sysdeps/aarch64/dl-tlsdesc.S +++ b/sysdeps/aarch64/dl-tlsdesc.S @@ -176,6 +176,8 @@ _dl_tlsdesc_dynamic: # define NSAVEXREGPAIRS 2 stp x29, x30, [sp,#-(32+16*NSAVEXREGPAIRS)]! cfi_adjust_cfa_offset (32+16*NSAVEXREGPAIRS) + cfi_rel_offset (x29, 0) + cfi_rel_offset (x30, 8) mov x29, sp DELOUSE (0) @@ -183,7 +185,11 @@ _dl_tlsdesc_dynamic: into slow path we will save additional registers. */ stp x1, x2, [sp, #32+16*0] + cfi_rel_offset (x1, 32) + cfi_rel_offset (x2, 32+8) stp x3, x4, [sp, #32+16*1] + cfi_rel_offset (x3, 32+16) + cfi_rel_offset (x4, 32+24) mrs x4, tpidr_el0 /* The ldar here happens after the load from [x0] at the call site @@ -213,6 +219,8 @@ _dl_tlsdesc_dynamic: ldp x29, x30, [sp], #(32+16*NSAVEXREGPAIRS) cfi_adjust_cfa_offset (-32-16*NSAVEXREGPAIRS) + cfi_restore (x29) + cfi_restore (x30) # undef NSAVEXREGPAIRS RET 2: @@ -224,12 +232,26 @@ _dl_tlsdesc_dynamic: # define NSAVEXREGPAIRS 7 stp x5, x6, [sp, #-16*NSAVEXREGPAIRS]! cfi_adjust_cfa_offset (16*NSAVEXREGPAIRS) + cfi_rel_offset (x5, 0) + cfi_rel_offset (x6, 8) stp x7, x8, [sp, #16*1] + cfi_rel_offset (x7, 16) + cfi_rel_offset (x8, 16+8) stp x9, x10, [sp, #16*2] + cfi_rel_offset (x9, 16*2) + cfi_rel_offset (x10, 16*2+8) stp x11, x12, [sp, #16*3] + cfi_rel_offset (x11, 16*3) + cfi_rel_offset (x12, 16*3+8) stp x13, x14, [sp, #16*4] + cfi_rel_offset (x13, 16*4) + cfi_rel_offset (x14, 16*4+8) stp x15, x16, [sp, #16*5] + cfi_rel_offset (x15, 16*5) + cfi_rel_offset (x16, 16*5+8) stp x17, x18, [sp, #16*6] + cfi_rel_offset (x17, 16*6) + cfi_rel_offset (x18, 16*6+8) SAVE_Q_REGISTERS @@ -268,18 +290,41 @@ _dl_tlsdesc_dynamic: .align 2 _dl_tlsdesc_resolve_rela: #define NSAVEXREGPAIRS 9 + /* The tlsdesc PLT entry pushes x2 and x3 to the stack. */ + cfi_adjust_cfa_offset (16) + cfi_rel_offset (x2, 0) + cfi_rel_offset (x3, 8) stp x29, x30, [sp, #-(32+16*NSAVEXREGPAIRS)]! cfi_adjust_cfa_offset (32+16*NSAVEXREGPAIRS) + cfi_rel_offset (x29, 0) + cfi_rel_offset (x30, 8) mov x29, sp stp x1, x4, [sp, #32+16*0] + cfi_rel_offset (x1, 32) + cfi_rel_offset (x4, 32+8) stp x5, x6, [sp, #32+16*1] + cfi_rel_offset (x5, 32+16) + cfi_rel_offset (x6, 32+16+8) stp x7, x8, [sp, #32+16*2] + cfi_rel_offset (x7, 32+16*2) + cfi_rel_offset (x8, 32+16*2+8) stp x9, x10, [sp, #32+16*3] + cfi_rel_offset (x9, 32+16*3) + cfi_rel_offset (x10, 32+16*3+8) stp x11, x12, [sp, #32+16*4] + cfi_rel_offset (x11, 32+16*4) + cfi_rel_offset (x12, 32+16*4+8) stp x13, x14, [sp, #32+16*5] + cfi_rel_offset (x13, 32+16*5) + cfi_rel_offset (x14, 32+16*5+8) stp x15, x16, [sp, #32+16*6] + cfi_rel_offset (x15, 32+16*6) + cfi_rel_offset (x16, 32+16*6+8) stp x17, x18, [sp, #32+16*7] + cfi_rel_offset (x17, 32+16*7) + cfi_rel_offset (x18, 32+16*7+8) str x0, [sp, #32+16*8] + cfi_rel_offset (x0, 32+16*8) SAVE_Q_REGISTERS @@ -304,6 +349,8 @@ _dl_tlsdesc_resolve_rela: ldp x17, x18, [sp, #32+16*7] ldp x29, x30, [sp], #(32+16*NSAVEXREGPAIRS) cfi_adjust_cfa_offset (-32-16*NSAVEXREGPAIRS) + cfi_restore (x29) + cfi_restore (x30) ldp x2, x3, [sp], #16 cfi_adjust_cfa_offset (-16) RET @@ -332,17 +379,38 @@ _dl_tlsdesc_resolve_hold: 1: stp x29, x30, [sp, #-(32+16*NSAVEXREGPAIRS)]! cfi_adjust_cfa_offset (32+16*NSAVEXREGPAIRS) + cfi_rel_offset (x29, 0) + cfi_rel_offset (x30, 8) mov x29, sp stp x1, x2, [sp, #32+16*0] + cfi_rel_offset (x1, 32) + cfi_rel_offset (x2, 32+8) stp x3, x4, [sp, #32+16*1] + cfi_rel_offset (x3, 32+16) + cfi_rel_offset (x4, 32+16+8) stp x5, x6, [sp, #32+16*2] + cfi_rel_offset (x5, 32+16*2) + cfi_rel_offset (x6, 32+16*2+8) stp x7, x8, [sp, #32+16*3] + cfi_rel_offset (x7, 32+16*3) + cfi_rel_offset (x8, 32+16*3+8) stp x9, x10, [sp, #32+16*4] + cfi_rel_offset (x9, 32+16*4) + cfi_rel_offset (x10, 32+16*4+8) stp x11, x12, [sp, #32+16*5] + cfi_rel_offset (x11, 32+16*5) + cfi_rel_offset (x12, 32+16*5+8) stp x13, x14, [sp, #32+16*6] + cfi_rel_offset (x13, 32+16*6) + cfi_rel_offset (x14, 32+16*6+8) stp x15, x16, [sp, #32+16*7] + cfi_rel_offset (x15, 32+16*7) + cfi_rel_offset (x16, 32+16*7+8) stp x17, x18, [sp, #32+16*8] + cfi_rel_offset (x17, 32+16*8) + cfi_rel_offset (x18, 32+16*8+8) str x0, [sp, #32+16*9] + cfi_rel_offset (x0, 32+16*9) SAVE_Q_REGISTERS @@ -367,6 +435,8 @@ _dl_tlsdesc_resolve_hold: ldp x17, x18, [sp, #32+16*8] ldp x29, x30, [sp], #(32+16*NSAVEXREGPAIRS) cfi_adjust_cfa_offset (-32-16*NSAVEXREGPAIRS) + cfi_restore (x29) + cfi_restore (x30) RET cfi_endproc .size _dl_tlsdesc_resolve_hold, .-_dl_tlsdesc_resolve_hold