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[src/trunk]: src/sys/arch/usermode Add KGDB definitions for i386
details: https://anonhg.NetBSD.org/src/rev/0f4061750b6d
branches: trunk
changeset: 834281:0f4061750b6d
user: reinoud <reinoud%NetBSD.org@localhost>
date: Sun Aug 05 18:42:48 2018 +0000
description:
Add KGDB definitions for i386
diffstat:
sys/arch/usermode/include/db_machdep.h | 27 +++++++++-
sys/arch/usermode/include/ucontext.h | 4 +-
sys/arch/usermode/usermode/cpufunc.S | 8 ++-
sys/arch/usermode/usermode/kgdb_machdep.c | 82 ++++++++++++------------------
4 files changed, 68 insertions(+), 53 deletions(-)
diffs (199 lines):
diff -r b1d55addbc08 -r 0f4061750b6d sys/arch/usermode/include/db_machdep.h
--- a/sys/arch/usermode/include/db_machdep.h Sun Aug 05 17:39:55 2018 +0000
+++ b/sys/arch/usermode/include/db_machdep.h Sun Aug 05 18:42:48 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: db_machdep.h,v 1.3 2018/08/01 09:50:57 reinoud Exp $ */
+/* $NetBSD: db_machdep.h,v 1.4 2018/08/05 18:42:48 reinoud Exp $ */
#ifndef _USERMODE_DB_MACHDEP_H
#define _USERMODE_DB_MACHDEP_H
@@ -27,6 +27,7 @@
#define ddb_regs (*ddb_regp)
#endif
+/* copied here in verbatim to remove dependencies */
#if defined(__i386__)
#define BKPT_SIZE 1
@@ -34,8 +35,30 @@
#define BKPT_ADDR(addr) (addr)
#define BKPT_SET(inst, addr) (BKPT_INST)
-#error append db_machdep.h for i386
+#define db_clear_single_step(regs) _UC_MACHINE_EFLAGS(regs) &= ~PSL_T
+#define db_set_single_step(regs) _UC_MACHINE_EFLAGS(regs) |= PSL_T
+
+#define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
+#define IS_WATCHPOINT_TRAP(type, code) ((type) == T_TRCTRAP && (code) & 15)
+
+#define I_CALL 0xe8
+#define I_CALLI 0xff
+#define I_RET 0xc3
+#define I_IRET 0xcf
+#define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
+#define inst_return(ins) (((ins)&0xff) == I_RET)
+#define inst_call(ins) (((ins)&0xff) == I_CALL || \
+ (((ins)&0xff) == I_CALLI && \
+ ((ins)&0x3800) == 0x1000))
+#define inst_load(ins) 0
+#define inst_store(ins) 0
+
+typedef int kgdb_reg_t;
+#define KGDB_NUMREGS 16
+#define KGDB_BUFLEN 512
+
+/* copied here in verbatim to remove dependencies */
#elif defined(__x86_64__)
#define DDB_EXPR_FMT "l" /* expression is long */
diff -r b1d55addbc08 -r 0f4061750b6d sys/arch/usermode/include/ucontext.h
--- a/sys/arch/usermode/include/ucontext.h Sun Aug 05 17:39:55 2018 +0000
+++ b/sys/arch/usermode/include/ucontext.h Sun Aug 05 18:42:48 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ucontext.h,v 1.1 2018/08/01 09:52:15 reinoud Exp $ */
+/* $NetBSD: ucontext.h,v 1.2 2018/08/05 18:42:48 reinoud Exp $ */
#ifndef _USERMODE_UCONTEXT_H
#define _USERMODE_UCONTEXT_H
@@ -9,6 +9,8 @@
#if defined(__i386__)
+#define _UC_MACHINE_EFLAGS(uc) ((uc)->uc_mcontext.__gregs[_REG_EFL])
+
#elif defined(__x86_64__)
#define _UC_MACHINE_RFLAGS(uc) ((uc)->uc_mcontext.__gregs[26])
diff -r b1d55addbc08 -r 0f4061750b6d sys/arch/usermode/usermode/cpufunc.S
--- a/sys/arch/usermode/usermode/cpufunc.S Sun Aug 05 17:39:55 2018 +0000
+++ b/sys/arch/usermode/usermode/cpufunc.S Sun Aug 05 18:42:48 2018 +0000
@@ -5,10 +5,14 @@
#if defined(__i386__)
ENTRY(breakpoint)
- .byte 0xcc // BKPT_INST
+ pushl %ebp
+ movl %esp, %ebp
+ int $0x03 /* paranoid, not 'int3' */
+ popl %ebp
ret
+END(breakpoint)
-#error implement setjmp/longjmp for i386
+//#error TODO implement setjmp/longjmp for i386?
#elif defined(__amd64__)
ENTRY(breakpoint)
diff -r b1d55addbc08 -r 0f4061750b6d sys/arch/usermode/usermode/kgdb_machdep.c
--- a/sys/arch/usermode/usermode/kgdb_machdep.c Sun Aug 05 17:39:55 2018 +0000
+++ b/sys/arch/usermode/usermode/kgdb_machdep.c Sun Aug 05 18:42:48 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: kgdb_machdep.c,v 1.3 2018/08/01 10:24:41 reinoud Exp $ */
+/* $NetBSD: kgdb_machdep.c,v 1.4 2018/08/05 18:42:48 reinoud Exp $ */
/*
* Copyright (c) 1996 Matthias Pfaller.
@@ -26,7 +26,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.3 2018/08/01 10:24:41 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.4 2018/08/05 18:42:48 reinoud Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
@@ -127,34 +127,25 @@
gdb_regs[19] = gregs[_REG_SS];
#elif defined(__i386)
- gdb_regs[ 0] = regs->tf_eax;
- gdb_regs[ 1] = regs->tf_ecx;
- gdb_regs[ 2] = regs->tf_edx;
- gdb_regs[ 3] = regs->tf_ebx;
- gdb_regs[ 4] = regs->tf_esp;
- gdb_regs[ 5] = regs->tf_ebp;
- gdb_regs[ 6] = regs->tf_esi;
- gdb_regs[ 7] = regs->tf_edi;
- gdb_regs[ 8] = regs->tf_eip;
- gdb_regs[ 9] = regs->tf_eflags;
- gdb_regs[10] = regs->tf_cs;
- gdb_regs[11] = regs->tf_ss;
- gdb_regs[12] = regs->tf_ds;
- gdb_regs[13] = regs->tf_es;
- gdb_regs[14] = regs->tf_fs;
- gdb_regs[15] = regs->tf_gs;
+ kgdb_reg_t *gregs = regs->uc_mcontext.__gregs;
-/*XXX OOPS XXX? */
-#if 0
- if (KERNELMODE(regs->tf_cs)) {
- /*
- * Kernel mode - esp and ss not saved.
- */
- gdb_regs[ 4] = (kgdb_reg_t)®s->tf_esp; /* kernel stack
- pointer */
- gdb_regs[11] = x86_getss();
- }
-#endif
+ gdb_regs[ 0] = gregs[_REG_EAX];
+ gdb_regs[ 1] = gregs[_REG_ECX];
+ gdb_regs[ 2] = gregs[_REG_EDX];
+ gdb_regs[ 3] = gregs[_REG_EBX];
+ gdb_regs[ 4] = gregs[_REG_ESP];
+ gdb_regs[ 5] = gregs[_REG_EBP];
+ gdb_regs[ 6] = gregs[_REG_ESI];
+ gdb_regs[ 7] = gregs[_REG_EDI];
+ gdb_regs[ 8] = gregs[_REG_EIP];
+ gdb_regs[ 9] = gregs[_REG_EFL];
+ gdb_regs[10] = gregs[_REG_CS];
+ gdb_regs[11] = gregs[_REG_SS];
+ gdb_regs[12] = gregs[_REG_DS];
+ gdb_regs[13] = gregs[_REG_ES];
+ gdb_regs[14] = gregs[_REG_FS];
+ gdb_regs[15] = gregs[_REG_GS];
+
#else
#error port kgdb_machdep.c kgdb_getregs
#endif
@@ -192,26 +183,21 @@
gregs[_REG_SS ] = gdb_regs[19];
#elif defined(__i386)
panic("%s", __func__);
- regs->tf_eax = gdb_regs[ 0];
- regs->tf_ecx = gdb_regs[ 1];
- regs->tf_edx = gdb_regs[ 2];
- regs->tf_ebx = gdb_regs[ 3];
- regs->tf_ebp = gdb_regs[ 5];
- regs->tf_esi = gdb_regs[ 6];
- regs->tf_edi = gdb_regs[ 7];
- regs->tf_eip = gdb_regs[ 8];
- regs->tf_eflags = gdb_regs[ 9];
- regs->tf_cs = gdb_regs[10];
- regs->tf_ds = gdb_regs[12];
- regs->tf_es = gdb_regs[13];
+ kgdb_reg_t *gregs = regs->uc_mcontext.__gregs;
- if (KERNELMODE(regs->tf_cs) == 0) {
- /*
- * Trapped in user mode - restore esp and ss.
- */
- regs->tf_esp = gdb_regs[ 4];
- regs->tf_ss = gdb_regs[11];
- }
+ gregs[_REG_EAX] = gdb_regs[ 0];
+ gregs[_REG_ECX] = gdb_regs[ 1];
+ gregs[_REG_EDX] = gdb_regs[ 2];
+ gregs[_REG_EBX] = gdb_regs[ 3];
+ gregs[_REG_EBP] = gdb_regs[ 5];
+ gregs[_REG_ESI] = gdb_regs[ 6];
+ gregs[_REG_EDI] = gdb_regs[ 7];
+ gregs[_REG_EIP] = gdb_regs[ 8];
+ gregs[_REG_EFL] = gdb_regs[ 9];
+ gregs[_REG_CS] = gdb_regs[10];
+ gregs[_REG_DS] = gdb_regs[12];
+ gregs[_REG_ES] = gdb_regs[13];
+
#else
panic("%s", __func__);
#endif
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