File s390-machinemode.patch of Package binutils
binutils:e593ec3bee996af0d129eb53b2039d409e6e1d42
2012-09-06 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
* config/tc-s390.c (set_highgprs_p): New variable.
(s390_machinemode): New function.
(md_pseudo_table): Add new pseudo command machinemode.
(md_parse_option): Set set_highgprs_p to TRUE if -mzarch was
specified on command line.
(s390_elf_final_processing): Set the highgprs flag in the ELF
header depending on set_highgprs_p.
* doc/c-s390.texi: Document new pseudo machinemode.
diff --git a/gas/config/tc-s390.c b/gas/config/tc-s390.c
index 9bc582f..47ec175 100644
--- a/gas/config/tc-s390.c
+++ b/gas/config/tc-s390.c
@@ -44,6 +44,10 @@ static int s390_arch_size = 0;
static unsigned int current_cpu = S390_OPCODE_MAXCPU - 1;
static unsigned int current_mode_mask = 0;
+/* Set to TRUE if the highgprs flag in the ELF header needs to be set
+ for the output file. */
+static bfd_boolean set_highgprs_p = FALSE;
+
/* Whether to use user friendly register names. Default is TRUE. */
#ifndef TARGET_REG_NAMES_P
#define TARGET_REG_NAMES_P TRUE
@@ -86,22 +90,24 @@ static void s390_bss (int);
static void s390_insn (int);
static void s390_literals (int);
static void s390_machine (int);
+static void s390_machinemode (int);
const pseudo_typeS md_pseudo_table[] =
{
- { "align", s_align_bytes, 0 },
+ { "align", s_align_bytes, 0 },
/* Pseudo-ops which must be defined. */
- { "bss", s390_bss, 0 },
- { "insn", s390_insn, 0 },
+ { "bss", s390_bss, 0 },
+ { "insn", s390_insn, 0 },
/* Pseudo-ops which must be overridden. */
- { "byte", s390_byte, 0 },
- { "short", s390_elf_cons, 2 },
- { "long", s390_elf_cons, 4 },
- { "quad", s390_elf_cons, 8 },
- { "ltorg", s390_literals, 0 },
- { "string", stringer, 8 + 1 },
- { "machine", s390_machine, 0 },
- { NULL, NULL, 0 }
+ { "byte", s390_byte, 0 },
+ { "short", s390_elf_cons, 2 },
+ { "long", s390_elf_cons, 4 },
+ { "quad", s390_elf_cons, 8 },
+ { "ltorg", s390_literals, 0 },
+ { "string", stringer, 8 + 1 },
+ { "machine", s390_machine, 0 },
+ { "machinemode", s390_machinemode, 0 },
+ { NULL, NULL, 0 }
};
@@ -409,7 +415,11 @@ md_parse_option (int c, char *arg)
current_mode_mask = 1 << S390_OPCODE_ESA;
else if (arg != NULL && strcmp (arg, "zarch") == 0)
- current_mode_mask = 1 << S390_OPCODE_ZARCH;
+ {
+ if (s390_arch_size == 32)
+ set_highgprs_p = TRUE;
+ current_mode_mask = 1 << S390_OPCODE_ZARCH;
+ }
else if (arg != NULL && strncmp (arg, "arch=", 5) == 0)
{
@@ -1799,7 +1809,7 @@ s390_literals (int ignore ATTRIBUTE_UNUSED)
/* The .machine pseudo op allows to switch to a different CPU level in
the asm listing. The current CPU setting can be stored on a stack
- with .machine push and restored with .machined pop. */
+ with .machine push and restored with .machine pop. */
static void
s390_machine (int ignore ATTRIBUTE_UNUSED)
@@ -1863,6 +1873,83 @@ s390_machine (int ignore ATTRIBUTE_UNUSED)
demand_empty_rest_of_line ();
}
+/* The .machinemode pseudo op allows to switch to a different
+ architecture mode in the asm listing. The current architecture
+ mode setting can be stored on a stack with .machinemode push and
+ restored with .machinemode pop. */
+
+static void
+s390_machinemode (int ignore ATTRIBUTE_UNUSED)
+{
+ char *mode_string;
+#define MAX_HISTORY 100
+ static unsigned int *mode_history;
+ static int curr_hist;
+
+ SKIP_WHITESPACE ();
+
+ if (*input_line_pointer == '"')
+ {
+ int len;
+ mode_string = demand_copy_C_string (&len);
+ }
+ else
+ {
+ char c;
+ mode_string = input_line_pointer;
+ c = get_symbol_end ();
+ mode_string = xstrdup (mode_string);
+ *input_line_pointer = c;
+ }
+
+ if (mode_string != NULL)
+ {
+ unsigned int old_mode_mask = current_mode_mask;
+ char *p;
+
+ for (p = mode_string; *p != 0; p++)
+ *p = TOLOWER (*p);
+
+ if (strcmp (mode_string, "push") == 0)
+ {
+ if (mode_history == NULL)
+ mode_history = xmalloc (MAX_HISTORY * sizeof (*mode_history));
+
+ if (curr_hist >= MAX_HISTORY)
+ as_bad (_(".machinemode stack overflow"));
+ else
+ mode_history[curr_hist++] = current_mode_mask;
+ }
+ else if (strcmp (mode_string, "pop") == 0)
+ {
+ if (curr_hist <= 0)
+ as_bad (_(".machinemode stack underflow"));
+ else
+ current_mode_mask = mode_history[--curr_hist];
+ }
+ else
+ {
+ if (strcmp (mode_string, "esa") == 0)
+ current_mode_mask = 1 << S390_OPCODE_ESA;
+ else if (strcmp (mode_string, "zarch") == 0)
+ {
+ if (s390_arch_size == 32)
+ set_highgprs_p = TRUE;
+ current_mode_mask = 1 << S390_OPCODE_ZARCH;
+ }
+ else if (strcmp (mode_string, "zarch_nohighgprs") == 0)
+ current_mode_mask = 1 << S390_OPCODE_ZARCH;
+ else
+ as_bad (_("invalid machine `%s'"), mode_string);
+ }
+
+ if (current_mode_mask != old_mode_mask)
+ s390_setup_opcodes ();
+ }
+
+ demand_empty_rest_of_line ();
+}
+
char *
md_atof (int type, char *litp, int *sizep)
{
@@ -2381,6 +2468,6 @@ tc_s390_regname_to_dw2regnum (char *regname)
void
s390_elf_final_processing (void)
{
- if (s390_arch_size == 32 && (current_mode_mask & (1 << S390_OPCODE_ZARCH)))
+ if (set_highgprs_p)
elf_elfheader (stdoutput)->e_flags |= EF_S390_HIGH_GPRS;
}
diff --git a/gas/doc/c-s390.texi b/gas/doc/c-s390.texi
index 7971327..76dc144 100644
--- a/gas/doc/c-s390.texi
+++ b/gas/doc/c-s390.texi
@@ -873,6 +873,19 @@ restored with @code{.machine pop}. Be aware that the cpu string has
to be put into double quotes in case it contains characters not
appropriate for identifiers. So you have to write @code{"z9-109"}
instead of just @code{z9-109}.
+
+@cindex @code{.machinemode} directive, s390
+@item .machinemode string
+This directive allows to change the architecture mode for which code
+is being generated. @code{string} may be @code{esa}, @code{zarch},
+@code{zarch_nohighgprs}, @code{push}, or @code{pop}.
+@code{.machinemode zarch_nohighgprs} can be used to prevent the
+@code{highgprs} flag from being set in the ELF header of the output
+file. This is useful in situations where the code is gated with a
+runtime check which makes sure that the code is only executed on
+kernels providing the @code{highgprs} feature.
+@code{.machinemode push} saves the currently selected mode, which may
+be restored with @code{.machinemode pop}.
@end table
@node s390 Floating Point
