Date: Sun, 9 May 2004 13:40:24 -0700 (PDT) From: Marcel Moolenaar <marcel@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 52550 for review Message-ID: <200405092040.i49KeOVd040729@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=52550 Change 52550 by marcel@marcel_nfs on 2004/05/09 13:39:48 Replace all direct references to ddb_regs.tf_esp with a call to get_esp(). In get_esp() we handle the fact that tf_esp is valid only when crossing the user-kernel boundary. For some strange reason, backtraces for threads other than the one that entered the debugger do not work reliably yet. Affected files ... .. //depot/projects/gdb/sys/i386/i386/db_trace.c#3 edit Differences ... ==== //depot/projects/gdb/sys/i386/i386/db_trace.c#3 (text+ko) ==== @@ -58,6 +58,13 @@ static db_varfcn_t db_ss; static db_varfcn_t db_esp; +static __inline int +get_esp(void) +{ + return ((ISPL(ddb_regs.tf_cs)) ? ddb_regs.tf_esp : + (db_expr_t)kdb_frame + offsetof(struct trapframe, tf_esp)); +} + /* * Machine register set. */ @@ -118,8 +125,7 @@ db_esp (struct db_variable *vp, db_expr_t *valuep, int op) { if (op == DB_VAR_GET) - *valuep = (ISPL(ddb_regs.tf_cs)) ? ddb_regs.tf_esp : - ddb_regs.tf_ebp; + *valuep = get_esp(); else if (ISPL(ddb_regs.tf_cs)) ddb_regs.tf_esp = *valuep; return (0); @@ -294,8 +300,7 @@ tf = (struct trapframe *)((int)*fp + 8); if (INKERNEL((int) tf)) { - esp = (ISPL(tf->tf_cs) == SEL_UPL) ? - tf->tf_esp : (int)&tf->tf_esp; + esp = get_esp(); eip = tf->tf_eip; ebp = tf->tf_ebp; switch (frame_type) { @@ -394,26 +399,22 @@ int instr; instr = db_get_value(callpc, 4, FALSE); - if ((instr & 0x00ffffff) == 0x00e58955) { + if ((instr & 0xffffff) == 0x00e58955) { /* pushl %ebp; movl %esp, %ebp */ - actframe = (struct i386_frame *) - (ddb_regs.tf_esp - 4); - } else if ((instr & 0x0000ffff) == 0x0000e589) { + actframe = (void *)(get_esp() - 4); + } else if ((instr & 0xffff) == 0x0000e589) { /* movl %esp, %ebp */ - actframe = (struct i386_frame *) - ddb_regs.tf_esp; + actframe = (void *)get_esp(); if (ddb_regs.tf_ebp == 0) { - /* Fake caller's frame better. */ + /* Fake frame better. */ frame = actframe; } - } else if ((instr & 0x000000ff) == 0x000000c3) { + } else if ((instr & 0xff) == 0x000000c3) { /* ret */ - actframe = (struct i386_frame *) - (ddb_regs.tf_esp - 4); + actframe = (void *)(get_esp() - 4); } else if (offset == 0) { - /* Probably a symbol in assembler code. */ - actframe = (struct i386_frame *) - (ddb_regs.tf_esp - 4); + /* Probably an assembler symbol. */ + actframe = (void *)(get_esp() - 4); } } else if (strcmp(name, "fork_trampoline") == 0) { /*
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