ia32 core dumps

[Arun Sharma <arun.sharma@intel.com>]

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The attached patch implements core dump functionality for IA-32 applications running on ia64. In the absence of this patch, the kernel BUG()s out on ia32 core dump on 2.6.

	-Arun


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===== arch/ia64/ia32/binfmt_elf32.c 1.14 vs edited =====
--- 1.14/arch/ia64/ia32/binfmt_elf32.c	Wed Jul  2 21:22:38 2003
+++ edited/arch/ia64/ia32/binfmt_elf32.c	Mon Jul 21 14:39:59 2003
@@ -19,6 +19,7 @@
 #include <asm/signal.h>
 
 #include "ia32priv.h"
+#include "elfcore32.h"
 
 #define CONFIG_BINFMT_ELF32
 
===== arch/ia64/ia32/ia32priv.h 1.1 vs edited =====
--- 1.1/arch/ia64/ia32/ia32priv.h	Thu Jun 12 00:29:38 2003
+++ edited/arch/ia64/ia32/ia32priv.h	Mon Jul 21 15:15:41 2003
@@ -295,7 +295,6 @@
 #define IA32_TSS_OFFSET		(IA32_PAGE_OFFSET + PAGE_SIZE)
 #define IA32_LDT_OFFSET		(IA32_PAGE_OFFSET + 2*PAGE_SIZE)
 
-#define USE_ELF_CORE_DUMP
 #define ELF_EXEC_PAGESIZE	IA32_PAGE_SIZE
 
 /*
@@ -312,20 +311,6 @@
 
 #define elf_addr_t	u32
 
-/* ELF register definitions.  This is needed for core dump support.  */
-
-#define ELF_NGREG	128			/* XXX fix me */
-#define ELF_NFPREG	128			/* XXX fix me */
-
-typedef unsigned long elf_greg_t;
-typedef elf_greg_t elf_gregset_t[ELF_NGREG];
-
-typedef struct {
-	unsigned long w0;
-	unsigned long w1;
-} elf_fpreg_t;
-typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
-
 /* This macro yields a bitmask that programs can use to figure out
    what instruction set this CPU supports.  */
 #define ELF_HWCAP	0
@@ -471,6 +456,23 @@
 	register double f6 asm ("f6"); \
 	asm volatile ("ldf.fill f6=[%2];; stfe [%1]=f6" : "=f"(f6): "r"(dst),  "r"(src) : "memory"); \
 	} while(0)
+
+struct user_regs_struct32 {
+	__u32 ebx, ecx, edx, esi, edi, ebp, eax;
+	unsigned short ds, __ds, es, __es;
+	unsigned short fs, __fs, gs, __gs;
+	__u32 orig_eax, eip;
+	unsigned short cs, __cs;
+	__u32 eflags, esp;
+	unsigned short ss, __ss;
+};
+
+/* Prototypes for use in elfcore32.h */
+int save_ia32_fpstate (struct task_struct *tsk, 
+                       struct ia32_user_i387_struct *save);
+
+int save_ia32_fpxstate (struct task_struct *tsk, 
+			struct ia32_user_fxsr_struct *save);
 
 #endif /* !CONFIG_IA32_SUPPORT */
 
===== arch/ia64/ia32/sys_ia32.c 1.68 vs edited =====
--- 1.68/arch/ia64/ia32/sys_ia32.c	Tue Jul  8 13:57:44 2003
+++ edited/arch/ia64/ia32/sys_ia32.c	Mon Jul 21 14:40:00 2003
@@ -1866,7 +1866,7 @@
 	return;
 }
 
-static int
+int
 save_ia32_fpstate (struct task_struct *tsk, struct ia32_user_i387_struct *save)
 {
 	struct switch_stack *swp;
@@ -1928,7 +1928,7 @@
 	return 0;
 }
 
-static int
+int
 save_ia32_fpxstate (struct task_struct *tsk, struct ia32_user_fxsr_struct *save)
 {
 	struct switch_stack *swp;
--- /dev/null	Mon May 20 21:11:23 2002
+++ linux-ia64-2.5/arch/ia64/ia32/elfcore32.h	Mon Jul 21 15:14:36 2003
@@ -0,0 +1,128 @@
+/*
+ * IA-32 ELF core dump support.
+ *
+ * Copyright (C) 2003 Arun Sharma <arun.sharma@intel.com>
+ *
+ * Derived from the x86_64 version
+ */
+#ifndef _ELFCORE32_H_
+#define _ELFCORE32_H_
+
+#define USE_ELF_CORE_DUMP 1
+
+/* Override elfcore.h */ 
+#define _LINUX_ELFCORE_H 1
+typedef unsigned int elf_greg_t;
+
+#define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+typedef struct ia32_user_i387_struct elf_fpregset_t;
+typedef struct ia32_user_fxsr_struct elf_fpxregset_t;
+
+struct elf_siginfo
+{
+	int	si_signo;			/* signal number */
+	int	si_code;			/* extra code */
+	int	si_errno;			/* errno */
+};
+
+#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)
+
+struct elf_prstatus
+{
+	struct elf_siginfo pr_info;	/* Info associated with signal */
+	short	pr_cursig;		/* Current signal */
+	unsigned int pr_sigpend;	/* Set of pending signals */
+	unsigned int pr_sighold;	/* Set of held signals */
+	pid_t	pr_pid;
+	pid_t	pr_ppid;
+	pid_t	pr_pgrp;
+	pid_t	pr_sid;
+	struct compat_timeval pr_utime;	/* User time */
+	struct compat_timeval pr_stime;	/* System time */
+	struct compat_timeval pr_cutime;	/* Cumulative user time */
+	struct compat_timeval pr_cstime;	/* Cumulative system time */
+	elf_gregset_t pr_reg;	/* GP registers */
+	int pr_fpvalid;		/* True if math co-processor being used.  */
+};
+
+#define ELF_PRARGSZ	(80)	/* Number of chars for args */
+
+struct elf_prpsinfo
+{
+	char	pr_state;	/* numeric process state */
+	char	pr_sname;	/* char for pr_state */
+	char	pr_zomb;	/* zombie */
+	char	pr_nice;	/* nice val */
+	unsigned int pr_flag;	/* flags */
+	__u16	pr_uid;
+	__u16	pr_gid;
+	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
+	/* Lots missing */
+	char	pr_fname[16];	/* filename of executable */
+	char	pr_psargs[ELF_PRARGSZ];	/* initial part of arg list */
+};
+
+#define ELF_CORE_COPY_REGS(pr_reg, regs)       		\
+	pr_reg[0] = regs->r11;				\
+	pr_reg[1] = regs->r9;				\
+	pr_reg[2] = regs->r10;				\
+	pr_reg[3] = regs->r14;				\
+	pr_reg[4] = regs->r15;				\
+	pr_reg[5] = regs->r13;				\
+	pr_reg[6] = regs->r8;				\
+	pr_reg[7] = regs->r16 & 0xffff;			\
+	pr_reg[8] = (regs->r16 >> 16) & 0xffff;		\
+	pr_reg[9] = (regs->r16 >> 32) & 0xffff;		\
+	pr_reg[10] = (regs->r16 >> 48) & 0xffff;	\
+	pr_reg[11] = regs->r1; 				\
+	pr_reg[12] = regs->cr_iip;			\
+	pr_reg[13] = regs->r17 & 0xffff;		\
+	asm volatile ("mov %0=ar.eflag ;;"		\
+		      : "=r"(pr_reg[14]));		\
+	pr_reg[15] = regs->r12;				\
+	pr_reg[16] = (regs->r17 >> 16) & 0xffff;
+
+static inline void elf_core_copy_regs(elf_gregset_t *elfregs,
+				      struct pt_regs *regs)
+{
+	ELF_CORE_COPY_REGS((*elfregs), regs)
+}
+
+static inline int elf_core_copy_task_regs(struct task_struct *t,
+					  elf_gregset_t* elfregs)
+{	
+	struct pt_regs *pp = ia64_task_regs(t);
+	ELF_CORE_COPY_REGS((*elfregs), pp);
+	return 1; 
+}
+
+static inline int 
+elf_core_copy_task_fpregs(struct task_struct *tsk, elf_fpregset_t *fpu)
+{
+	struct ia32_user_i387_struct *fpstate = (void*)fpu;
+
+	if (!tsk->used_math) 
+		return 0;
+
+	save_ia32_fpstate(tsk, fpstate);
+
+	return 1; 
+}
+
+#define ELF_CORE_COPY_XFPREGS 1
+static inline int 
+elf_core_copy_task_xfpregs(struct task_struct *tsk, elf_fpxregset_t *xfpu)
+{
+	struct ia32_user_fxsr_struct *fpxstate = (void*) xfpu; 
+
+	if (!tsk->used_math) 
+		return 0;
+
+	save_ia32_fpxstate(tsk, fpxstate);
+	
+	return 1;
+}
+
+#endif /* _ELFCORE32_H_ */