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Subject[PATCH 16/16] C6X: add support for DSBT binary format
Date
This patch adds the C6X-specifc bits to use the DSBT binary format.

Signed-off-by: Mark Salter <msalter@redhat.com>
---
arch/c6x/configs/ti_dsk6455_defconfig | 1 +
arch/c6x/configs/ti_evmc6457_defconfig | 1 +
arch/c6x/configs/ti_evmc6472_defconfig | 1 +
arch/c6x/configs/ti_evmc6474_defconfig | 1 +
arch/c6x/configs/ti_evmc6474_lite_defconfig | 1 +
arch/c6x/include/asm/elf.h | 14 ++++++++++++++
arch/c6x/include/asm/mmu.h | 4 ++++
arch/c6x/include/asm/ptrace.h | 12 ++++++++++++
arch/c6x/kernel/ptrace.c | 25 ++++++++++++++++++++++++-
9 files changed, 59 insertions(+), 1 deletions(-)
diff --git a/arch/c6x/configs/ti_dsk6455_defconfig b/arch/c6x/configs/ti_dsk6455_defconfig
index 3487af4..8112a70 100644
--- a/arch/c6x/configs/ti_dsk6455_defconfig
+++ b/arch/c6x/configs/ti_dsk6455_defconfig
@@ -229,6 +229,7 @@ CONFIG_HIGH_RES_TIMERS=y
#
# Executable file formats
#
+CONFIG_BINFMT_ELF_DSBT=y
# CONFIG_BINFMT_FLAT is not set
# CONFIG_HAVE_AOUT is not set
# CONFIG_BINFMT_MISC is not set
diff --git a/arch/c6x/configs/ti_evmc6457_defconfig b/arch/c6x/configs/ti_evmc6457_defconfig
index e18b095..841f15a 100644
--- a/arch/c6x/configs/ti_evmc6457_defconfig
+++ b/arch/c6x/configs/ti_evmc6457_defconfig
@@ -229,6 +229,7 @@ CONFIG_HIGH_RES_TIMERS=y
#
# Executable file formats
#
+CONFIG_BINFMT_ELF_DSBT=y
# CONFIG_BINFMT_FLAT is not set
# CONFIG_HAVE_AOUT is not set
# CONFIG_BINFMT_MISC is not set
diff --git a/arch/c6x/configs/ti_evmc6472_defconfig b/arch/c6x/configs/ti_evmc6472_defconfig
index 14ae81b..b18e9ee 100644
--- a/arch/c6x/configs/ti_evmc6472_defconfig
+++ b/arch/c6x/configs/ti_evmc6472_defconfig
@@ -231,6 +231,7 @@ CONFIG_HIGH_RES_TIMERS=y
#
# Executable file formats
#
+CONFIG_BINFMT_ELF_DSBT=y
# CONFIG_BINFMT_FLAT is not set
# CONFIG_HAVE_AOUT is not set
# CONFIG_BINFMT_MISC is not set
diff --git a/arch/c6x/configs/ti_evmc6474_defconfig b/arch/c6x/configs/ti_evmc6474_defconfig
index 472ad6b..12f1808 100644
--- a/arch/c6x/configs/ti_evmc6474_defconfig
+++ b/arch/c6x/configs/ti_evmc6474_defconfig
@@ -229,6 +229,7 @@ CONFIG_HIGH_RES_TIMERS=y
#
# Executable file formats
#
+CONFIG_BINFMT_ELF_DSBT=y
# CONFIG_BINFMT_FLAT is not set
# CONFIG_HAVE_AOUT is not set
# CONFIG_BINFMT_MISC is not set
diff --git a/arch/c6x/configs/ti_evmc6474_lite_defconfig b/arch/c6x/configs/ti_evmc6474_lite_defconfig
index e25e8ac..044cf47 100644
--- a/arch/c6x/configs/ti_evmc6474_lite_defconfig
+++ b/arch/c6x/configs/ti_evmc6474_lite_defconfig
@@ -229,6 +229,7 @@ CONFIG_HIGH_RES_TIMERS=y
#
# Executable file formats
#
+CONFIG_BINFMT_ELF_DSBT=y
# CONFIG_BINFMT_FLAT is not set
# CONFIG_HAVE_AOUT is not set
# CONFIG_BINFMT_MISC is not set
diff --git a/arch/c6x/include/asm/elf.h b/arch/c6x/include/asm/elf.h
index 272c3ae..d57bb17 100644
--- a/arch/c6x/include/asm/elf.h
+++ b/arch/c6x/include/asm/elf.h
@@ -32,6 +32,7 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
*/
#define elf_check_arch(x) ((x)->e_machine == EM_TI_C6000)

+#define elf_check_dsbt(x) (1)
#define elf_check_const_displacement(x) (1)

/*
@@ -67,6 +68,14 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];

#define ELF_PLATFORM (NULL)

+#define ELF_DSBT_PLAT_INIT(_regs, _exec_map, _interp_map, _dynamic_addr, _dsbt_table) \
+do { \
+ _regs->b4 = (_exec_map); \
+ _regs->a6 = (_interp_map); \
+ _regs->b6 = (_dynamic_addr); \
+ _regs->dp = (_dsbt_table); \
+} while (0)
+
#define SET_PERSONALITY(ex) set_personality(PER_LINUX)

/* C6X specific section types */
@@ -112,4 +121,9 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
#define R_C6000_FPHEAD 254
#define R_C6000_NOCMP 255

+/* for binfmt_elf_dsbt */
+#define DT_ARCH_DSBT_BASE DT_C6000_DSBT_BASE
+#define DT_ARCH_DSBT_SIZE DT_C6000_DSBT_SIZE
+#define DT_ARCH_DSBT_INDEX DT_C6000_DSBT_INDEX
+
#endif /*_ASM_C6X_ELF_H */
diff --git a/arch/c6x/include/asm/mmu.h b/arch/c6x/include/asm/mmu.h
index 8d376e9..1d9e9c1 100644
--- a/arch/c6x/include/asm/mmu.h
+++ b/arch/c6x/include/asm/mmu.h
@@ -15,6 +15,10 @@

typedef struct {
unsigned long end_brk;
+#ifdef CONFIG_BINFMT_ELF_DSBT
+ unsigned long exec_dsbt_loadmap;
+ unsigned long interp_dsbt_loadmap;
+#endif
} mm_context_t;

#endif /* _ASM_C6X_MMU_H */
diff --git a/arch/c6x/include/asm/ptrace.h b/arch/c6x/include/asm/ptrace.h
index 7e94de8..437df6f 100644
--- a/arch/c6x/include/asm/ptrace.h
+++ b/arch/c6x/include/asm/ptrace.h
@@ -162,11 +162,23 @@ struct pt_regs {
REG_PAIR(sp, dp);
};

+/*
+ * These are 'magic' values for PTRACE_PEEKUSR that return info about where a
+ * process is located in memory.
+ */
+#define PT_TEXT_ADDR 0x10000
+#define PT_DATA_ADDR 0x10004
+#define PT_TEXT_END_ADDR 0x10008
+
#define PTRACE_GETREGS 12
#define PTRACE_SETREGS 13
#define PTRACE_GETFPREGS 14
#define PTRACE_SETFPREGS 15

+#define PTRACE_GETDSBT 31 /* get the ELF DSBT loadmap address */
+#define PTRACE_GETDSBT_EXEC 0 /* [addr] request the executable loadmap */
+#define PTRACE_GETDSBT_INTERP 1 /* [addr] request the interpreter loadmap */
+
#ifdef __KERNEL__

#define DEFAULT_CSR 0x0001 /* interrupt enable by default */
diff --git a/arch/c6x/kernel/ptrace.c b/arch/c6x/kernel/ptrace.c
index fd38463..aa853e4 100644
--- a/arch/c6x/kernel/ptrace.c
+++ b/arch/c6x/kernel/ptrace.c
@@ -167,7 +167,13 @@ static int ptrace_read_user(struct task_struct *tsk, unsigned long off,


tmp = 0;
- if (off < PT_REG_SIZE)
+ if (index == PT_TEXT_ADDR)
+ tmp = tsk->mm->start_code;
+ else if (index == PT_DATA_ADDR)
+ tmp = tsk->mm->start_data;
+ else if (index == PT_TEXT_END_ADDR)
+ tmp = tsk->mm->end_code;
+ else if (off < PT_REG_SIZE)
tmp = get_reg(tsk, index);
else
return -EIO;
@@ -250,6 +256,23 @@ long arch_ptrace(struct task_struct *child, long request,
}
break;

+ case PTRACE_GETDSBT: {
+ tmp = 0;
+ switch (addr) {
+ case PTRACE_GETDSBT_EXEC:
+ tmp = child->mm->context.exec_dsbt_loadmap;
+ break;
+ case PTRACE_GETDSBT_INTERP:
+ tmp = child->mm->context.interp_dsbt_loadmap;
+ break;
+ default:
+ break;
+ }
+
+ ret = put_user(tmp, (unsigned long __user *)data);
+ break;
+ }
+
default:
ret = ptrace_request(child, request, addr, data);
break;
--
1.6.2.5


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