From: Guo Ren <ren_guo@c-sky.com>
To: akpm@linux-foundation.org, arnd@arndb.de,
daniel.lezcano@linaro.org, davem@davemloft.net,
gregkh@linuxfoundation.org, hch@infradead.org,
marc.zyngier@arm.com, mark.rutland@arm.com, peterz@infradead.org,
robh@kernel.org, tglx@linutronix.de
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
devicetree@vger.kernel.org, robh+dt@kernel.org,
c-sky_gcc_upstream@c-sky.com, Guo Ren <ren_guo@c-sky.com>
Subject: [PATCH V9 12/21] csky: ELF and module probe
Date: Tue, 16 Oct 2018 10:58:31 +0800 [thread overview]
Message-ID: <27589f69f513177892d39868050dccb5f21023aa.1539655732.git.ren_guo@c-sky.com> (raw)
In-Reply-To: <cover.1539655731.git.ren_guo@c-sky.com>
In-Reply-To: <cover.1539655731.git.ren_guo@c-sky.com>
This patch adds ELF definition and module relocate codes.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
---
arch/csky/abiv1/inc/abi/elf.h | 26 ++++++++++++
arch/csky/abiv2/inc/abi/elf.h | 43 ++++++++++++++++++++
arch/csky/include/asm/elf.h | 85 +++++++++++++++++++++++++++++++++++++++
arch/csky/kernel/module.c | 92 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 246 insertions(+)
create mode 100644 arch/csky/abiv1/inc/abi/elf.h
create mode 100644 arch/csky/abiv2/inc/abi/elf.h
create mode 100644 arch/csky/include/asm/elf.h
create mode 100644 arch/csky/kernel/module.c
diff --git a/arch/csky/abiv1/inc/abi/elf.h b/arch/csky/abiv1/inc/abi/elf.h
new file mode 100644
index 0000000..3058cc0
--- /dev/null
+++ b/arch/csky/abiv1/inc/abi/elf.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ABI_CSKY_ELF_H
+#define __ABI_CSKY_ELF_H
+
+#define ELF_CORE_COPY_REGS(pr_reg, regs) do { \
+ pr_reg[0] = regs->pc; \
+ pr_reg[1] = regs->regs[9]; \
+ pr_reg[2] = regs->usp; \
+ pr_reg[3] = regs->sr; \
+ pr_reg[4] = regs->a0; \
+ pr_reg[5] = regs->a1; \
+ pr_reg[6] = regs->a2; \
+ pr_reg[7] = regs->a3; \
+ pr_reg[8] = regs->regs[0]; \
+ pr_reg[9] = regs->regs[1]; \
+ pr_reg[10] = regs->regs[2]; \
+ pr_reg[11] = regs->regs[3]; \
+ pr_reg[12] = regs->regs[4]; \
+ pr_reg[13] = regs->regs[5]; \
+ pr_reg[14] = regs->regs[6]; \
+ pr_reg[15] = regs->regs[7]; \
+ pr_reg[16] = regs->regs[8]; \
+ pr_reg[17] = regs->lr; \
+} while (0);
+#endif /* __ABI_CSKY_ELF_H */
diff --git a/arch/csky/abiv2/inc/abi/elf.h b/arch/csky/abiv2/inc/abi/elf.h
new file mode 100644
index 0000000..290f49e
--- /dev/null
+++ b/arch/csky/abiv2/inc/abi/elf.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ABI_CSKY_ELF_H
+#define __ABI_CSKY_ELF_H
+
+/* The member sort in array pr_reg[x] is defined by GDB. */
+#define ELF_CORE_COPY_REGS(pr_reg, regs) do { \
+ pr_reg[0] = regs->pc; \
+ pr_reg[1] = regs->a1; \
+ pr_reg[2] = regs->a0; \
+ pr_reg[3] = regs->sr; \
+ pr_reg[4] = regs->a2; \
+ pr_reg[5] = regs->a3; \
+ pr_reg[6] = regs->regs[0]; \
+ pr_reg[7] = regs->regs[1]; \
+ pr_reg[8] = regs->regs[2]; \
+ pr_reg[9] = regs->regs[3]; \
+ pr_reg[10] = regs->regs[4]; \
+ pr_reg[11] = regs->regs[5]; \
+ pr_reg[12] = regs->regs[6]; \
+ pr_reg[13] = regs->regs[7]; \
+ pr_reg[14] = regs->regs[8]; \
+ pr_reg[15] = regs->regs[9]; \
+ pr_reg[16] = regs->usp; \
+ pr_reg[17] = regs->lr; \
+ pr_reg[18] = regs->exregs[0]; \
+ pr_reg[19] = regs->exregs[1]; \
+ pr_reg[20] = regs->exregs[2]; \
+ pr_reg[21] = regs->exregs[3]; \
+ pr_reg[22] = regs->exregs[4]; \
+ pr_reg[23] = regs->exregs[5]; \
+ pr_reg[24] = regs->exregs[6]; \
+ pr_reg[25] = regs->exregs[7]; \
+ pr_reg[26] = regs->exregs[8]; \
+ pr_reg[27] = regs->exregs[9]; \
+ pr_reg[28] = regs->exregs[10]; \
+ pr_reg[29] = regs->exregs[11]; \
+ pr_reg[30] = regs->exregs[12]; \
+ pr_reg[31] = regs->exregs[13]; \
+ pr_reg[32] = regs->exregs[14]; \
+ pr_reg[33] = regs->tls; \
+} while (0);
+#endif /* __ABI_CSKY_ELF_H */
diff --git a/arch/csky/include/asm/elf.h b/arch/csky/include/asm/elf.h
new file mode 100644
index 0000000..773b133
--- /dev/null
+++ b/arch/csky/include/asm/elf.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ASM_CSKY_ELF_H
+#define __ASM_CSKY_ELF_H
+
+#include <asm/ptrace.h>
+#include <abi/regdef.h>
+
+#define ELF_ARCH 252
+
+/* CSKY Relocations */
+#define R_CSKY_NONE 0
+#define R_CSKY_32 1
+#define R_CSKY_PCIMM8BY4 2
+#define R_CSKY_PCIMM11BY2 3
+#define R_CSKY_PCIMM4BY2 4
+#define R_CSKY_PC32 5
+#define R_CSKY_PCRELJSR_IMM11BY2 6
+#define R_CSKY_GNU_VTINHERIT 7
+#define R_CSKY_GNU_VTENTRY 8
+#define R_CSKY_RELATIVE 9
+#define R_CSKY_COPY 10
+#define R_CSKY_GLOB_DAT 11
+#define R_CSKY_JUMP_SLOT 12
+#define R_CSKY_ADDR_HI16 24
+#define R_CSKY_ADDR_LO16 25
+#define R_CSKY_PCRELJSR_IMM26BY2 40
+
+typedef unsigned long elf_greg_t;
+
+typedef struct user_fp elf_fpregset_t;
+
+#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
+
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+/*
+ * This is used to ensure we don't load something for the wrong architecture.
+ */
+#define elf_check_arch(x) ((x)->e_machine == ELF_ARCH)
+
+/*
+ * These are used to set parameters in the core dumps.
+ */
+#define USE_ELF_CORE_DUMP
+#define ELF_EXEC_PAGESIZE 4096
+#define ELF_CLASS ELFCLASS32
+#define ELF_PLAT_INIT(_r, load_addr) { _r->a0 = 0; }
+
+#ifdef __cskyBE__
+#define ELF_DATA ELFDATA2MSB
+#else
+#define ELF_DATA ELFDATA2LSB
+#endif
+
+/*
+ * This is the location that an ET_DYN program is loaded if exec'ed. Typical
+ * use of this is to invoke "./ld.so someprog" to test out a new version of
+ * the loader. We need to make sure that it is out of the way of the program
+ * that it will "exec", and that there is sufficient room for the brk.
+ */
+#define ELF_ET_DYN_BASE 0x0UL
+#include <abi/elf.h>
+
+/* Similar, but for a thread other than current. */
+struct task_struct;
+extern int dump_task_regs(struct task_struct *tsk, elf_gregset_t *elf_regs);
+#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
+
+#define ELF_HWCAP (0)
+
+/*
+ * This yields a string that ld.so will use to load implementation specific
+ * libraries for optimization. This is more specific in intent than poking
+ * at uname or /proc/cpuinfo.
+ */
+#define ELF_PLATFORM (NULL)
+#define SET_PERSONALITY(ex) set_personality(PER_LINUX)
+
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
+struct linux_binprm;
+extern int arch_setup_additional_pages(struct linux_binprm *bprm,
+ int uses_interp);
+#endif /* __ASM_CSKY_ELF_H */
diff --git a/arch/csky/kernel/module.c b/arch/csky/kernel/module.c
new file mode 100644
index 0000000..65abab0
--- /dev/null
+++ b/arch/csky/kernel/module.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/moduleloader.h>
+#include <linux/elf.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <asm/pgtable.h>
+
+#if defined(__CSKYABIV2__)
+#define IS_BSR32(hi16, lo16) (((hi16) & 0xFC00) == 0xE000)
+#define IS_JSRI32(hi16, lo16) ((hi16) == 0xEAE0)
+
+#define CHANGE_JSRI_TO_LRW(addr) do { \
+ *(uint16_t *)(addr) = (*(uint16_t *)(addr) & 0xFF9F) | 0x001a; \
+ *((uint16_t *)(addr) + 1) = *((uint16_t *)(addr) + 1) & 0xFFFF; \
+} while (0)
+
+#define SET_JSR32_R26(addr) do { \
+ *(uint16_t *)(addr) = 0xE8Fa; \
+ *((uint16_t *)(addr) + 1) = 0x0000; \
+} while (0)
+#endif
+
+int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
+ unsigned int symindex, unsigned int relsec, struct module *me)
+{
+ unsigned int i;
+ Elf32_Rela *rel = (void *) sechdrs[relsec].sh_addr;
+ Elf32_Sym *sym;
+ uint32_t *location;
+ short *temp;
+#if defined(__CSKYABIV2__)
+ uint16_t *location_tmp;
+#endif
+
+ for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+ /* This is where to make the change */
+ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
+ + rel[i].r_offset;
+ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+ + ELF32_R_SYM(rel[i].r_info);
+
+ switch (ELF32_R_TYPE(rel[i].r_info)) {
+ case R_CSKY_32:
+ /* We add the value into the location given */
+ *location = rel[i].r_addend + sym->st_value;
+ break;
+ case R_CSKY_PC32:
+ /* Add the value, subtract its postition */
+ *location = rel[i].r_addend + sym->st_value
+ - (uint32_t)location;
+ break;
+ case R_CSKY_PCRELJSR_IMM11BY2:
+ break;
+ case R_CSKY_PCRELJSR_IMM26BY2:
+#if defined(__CSKYABIV2__)
+ location_tmp = (uint16_t *)location;
+ if (IS_BSR32(*location_tmp, *(location_tmp + 1)))
+ break;
+
+ if (IS_JSRI32(*location_tmp, *(location_tmp + 1))) {
+ /* jsri 0x... --> lrw r26, 0x... */
+ CHANGE_JSRI_TO_LRW(location);
+ /* lsli r0, r0 --> jsr r26 */
+ SET_JSR32_R26(location + 1);
+ }
+#endif
+ break;
+ case R_CSKY_ADDR_HI16:
+ temp = ((short *)location) + 1;
+ *temp = (short)
+ ((rel[i].r_addend + sym->st_value) >> 16);
+ break;
+ case R_CSKY_ADDR_LO16:
+ temp = ((short *)location) + 1;
+ *temp = (short)
+ ((rel[i].r_addend + sym->st_value) & 0xffff);
+ break;
+ default:
+ pr_err("module %s: Unknown relocation: %u\n",
+ me->name, ELF32_R_TYPE(rel[i].r_info));
+ return -ENOEXEC;
+ }
+ }
+ return 0;
+}
--
2.7.4
next prev parent reply other threads:[~2018-10-16 3:02 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-16 2:58 [PATCH V9 00/21] C-SKY(csky) Linux Kernel Port Guo Ren
2018-10-16 2:58 ` [PATCH V9 01/21] csky: Build infrastructure Guo Ren
2018-10-23 0:08 ` Guo Ren
2018-10-24 22:53 ` Arnd Bergmann
2018-10-25 17:04 ` Guo Ren
2018-10-16 2:58 ` [PATCH V9 02/21] csky: defconfig Guo Ren
2018-10-17 14:56 ` Arnd Bergmann
2018-10-16 2:58 ` [PATCH V9 03/21] csky: Kernel booting Guo Ren
2018-10-17 14:58 ` Arnd Bergmann
2018-10-16 2:58 ` [PATCH V9 04/21] csky: Exception handling and mm-fault Guo Ren
2018-10-17 14:59 ` Arnd Bergmann
2018-10-16 2:58 ` [PATCH V9 05/21] csky: System Call Guo Ren
2018-10-17 15:02 ` Arnd Bergmann
2018-10-18 2:02 ` Guo Ren
2018-10-16 2:58 ` [PATCH V9 06/21] csky: Cache and TLB routines Guo Ren
2018-10-17 15:08 ` Arnd Bergmann
2018-10-16 2:58 ` [PATCH V9 07/21] csky: MMU and page table management Guo Ren
2018-10-17 15:06 ` Arnd Bergmann
2018-10-18 2:05 ` Guo Ren
2018-10-16 2:58 ` [PATCH V9 08/21] csky: Process management and Signal Guo Ren
2018-10-17 15:11 ` Arnd Bergmann
2018-10-18 2:37 ` Guo Ren
2018-10-16 2:58 ` [PATCH V9 09/21] csky: VDSO and rt_sigreturn Guo Ren
2018-10-17 15:13 ` Arnd Bergmann
2018-10-16 2:58 ` [PATCH V9 10/21] csky: IRQ handling Guo Ren
2018-10-17 15:14 ` Arnd Bergmann
2018-10-18 2:39 ` Guo Ren
2018-10-16 2:58 ` [PATCH V9 11/21] csky: Atomic operations Guo Ren
2018-10-17 15:17 ` Arnd Bergmann
2018-10-18 2:40 ` Guo Ren
2018-10-21 20:55 ` Peter Zijlstra
2018-10-22 1:52 ` Guo Ren
2018-10-16 2:58 ` Guo Ren [this message]
2018-10-17 15:18 ` [PATCH V9 12/21] csky: ELF and module probe Arnd Bergmann
2018-10-18 2:49 ` Guo Ren
2018-10-18 8:31 ` Arnd Bergmann
2018-10-16 2:58 ` [PATCH V9 13/21] csky: Library functions Guo Ren
2018-10-17 15:24 ` Arnd Bergmann
2018-10-18 3:10 ` Guo Ren
2018-10-16 2:58 ` [PATCH V9 14/21] csky: User access Guo Ren
2018-10-17 15:37 ` Arnd Bergmann
2018-10-16 2:58 ` [PATCH V9 15/21] csky: Debug and Ptrace GDB Guo Ren
2018-10-17 15:46 ` Arnd Bergmann
2018-10-18 3:17 ` Guo Ren
2018-10-16 2:58 ` [PATCH V9 16/21] csky: SMP support Guo Ren
2018-10-17 15:47 ` Arnd Bergmann
2018-10-16 2:58 ` [PATCH V9 17/21] csky: Misc headers Guo Ren
2018-10-17 15:49 ` Arnd Bergmann
2018-10-16 2:58 ` [PATCH V9 18/21] dt-bindings: csky CPU Bindings Guo Ren
2018-10-17 15:50 ` Arnd Bergmann
2018-10-18 3:21 ` Guo Ren
2018-10-18 3:45 ` Guo Ren
2018-10-18 14:31 ` Rob Herring
2018-10-19 2:19 ` Guo Ren
2018-10-16 2:58 ` [PATCH V9 19/21] dt-bindings: Add vendor prefix for csky Guo Ren
2018-10-16 2:58 ` [PATCH V9 20/21] MAINTAINERS: Add csky Guo Ren
2018-10-17 15:51 ` Arnd Bergmann
2018-10-16 5:48 ` [PATCH V9 21/21] csky: support dword access for get_user_size() Guo Ren
2018-10-17 15:44 ` Arnd Bergmann
2018-10-18 3:41 ` Guo Ren
2018-10-18 8:34 ` Arnd Bergmann
2018-10-18 8:57 ` Guo Ren
2018-10-24 7:17 ` Arnd Bergmann
2018-10-25 17:08 ` Guo Ren
2018-10-17 15:58 ` [PATCH V9 00/21] C-SKY(csky) Linux Kernel Port Arnd Bergmann
2018-10-18 4:10 ` Guo Ren
2018-10-18 8:36 ` Arnd Bergmann
2018-10-18 9:03 ` Guo Ren
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