From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/3610 Path: news.gmane.org!not-for-mail From: =?UTF-8?q?Timo=20Ter=C3=A4s?= Newsgroups: gmane.linux.lib.musl.general Subject: [PATCH v2] Unwind support for ARM EABI Date: Wed, 10 Jul 2013 21:41:39 +0300 Message-ID: <1373481699-17888-1-git-send-email-timo.teras@iki.fi> References: <20130710180506.GB29800@brightrain.aerifal.cx> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1373481688 3595 80.91.229.3 (10 Jul 2013 18:41:28 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 10 Jul 2013 18:41:28 +0000 (UTC) Cc: =?UTF-8?q?Timo=20Ter=C3=A4s?= To: musl@lists.openwall.com Original-X-From: musl-return-3614-gllmg-musl=m.gmane.org@lists.openwall.com Wed Jul 10 20:41:30 2013 Return-path: Envelope-to: gllmg-musl@plane.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1UwzKT-0000Eh-8p for gllmg-musl@plane.gmane.org; Wed, 10 Jul 2013 20:41:29 +0200 Original-Received: (qmail 32240 invoked by uid 550); 10 Jul 2013 18:41:28 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 32232 invoked from network); 10 Jul 2013 18:41:28 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:x-mailer:in-reply-to :references; bh=wjzsVGtURFEPRFQ8NtjnSgMlyyv0YhJqv2s1hcONSw4=; b=RTK7u1KBMdKoMpt9J07kzK3zWTcSTp194ZxuY9wcy3omoDDWWAJTSyw8fP+JWzDgil 6FmFy8nnKNFxwPvS/mwc+wrPyzBFtRSLzDvczGwq6mWlbcmku4G8+/ByWmLGO4x4OVMg 7cauCOhbyQxDTwTya2zSJuNJqfqXgk4RE8UQsqr+TYS09odLX0jUFCUP4aE+WiITt9uT iTiWfA0fIbEsxEtmslAf1ZsO7m41iezNpYbGuW51mVErvWtuWTHQhIYS1FkcehIcvNSK WzVo97hMvMdHPTyqxq+U3xX9eaOgxjeLA7M1h/l4UYt+xb9cIePCJt0hmVIrSWlZI++u aukg== X-Received: by 10.14.115.9 with SMTP id d9mr37514935eeh.87.1373481677038; Wed, 10 Jul 2013 11:41:17 -0700 (PDT) Original-Sender: =?UTF-8?Q?Timo_Ter=C3=A4s?= X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <20130710180506.GB29800@brightrain.aerifal.cx> Xref: news.gmane.org gmane.linux.lib.musl.general:3610 Archived-At: ARM EABI does not use the .eh_frame and .eh_frame_hdr for unwinding. Instead the ABI specifies it's own way to unwind using .ARM.exidx and .ARM.extab. libgcc uses __gnu_Unwind_Find_exidx (libc must implement this) when unwinding using exidx. This function is implemented here. --- arch/arm/src/find_exidx.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 arch/arm/src/find_exidx.c diff --git a/arch/arm/src/find_exidx.c b/arch/arm/src/find_exidx.c new file mode 100644 index 0000000..8ba9f30 --- /dev/null +++ b/arch/arm/src/find_exidx.c @@ -0,0 +1,46 @@ +#define _GNU_SOURCE +#include +#include + +typedef uintptr_t _Unwind_Ptr; + +struct find_exidx_data { + _Unwind_Ptr pc, exidx_start; + int exidx_len; +}; + +static int find_exidx(struct dl_phdr_info *info, size_t size, void *ptr) +{ + struct find_exidx_data *data = ptr; + const ElfW(Phdr) *phdr = info->dlpi_phdr; + _Unwind_Ptr addr, exidx_start = 0; + int i, match = 0, exidx_len = 0; + + for (i = info->dlpi_phnum; i > 0; i--, phdr++) { + addr = info->dlpi_addr + phdr->p_vaddr; + switch (phdr->p_type) { + case PT_LOAD: + match |= data->pc >= addr && data->pc < addr + phdr->p_memsz; + break; + case PT_ARM_EXIDX: + exidx_start = addr; + exidx_len = phdr->p_memsz; + break; + } + } + if (match) { + data->exidx_start = exidx_start; + data->exidx_len = exidx_len; + } + return match; +} + +_Unwind_Ptr __gnu_Unwind_Find_exidx(_Unwind_Ptr pc, int *pcount) +{ + struct find_exidx_data data; + data.pc = pc; + if (dl_iterate_phdr(find_exidx, &data) <= 0) + return 0; + *pcount = data.exidx_len / 8; + return data.exidx_start; +} -- 1.8.3.2