diff options
Diffstat (limited to 'gcc/config/xtensa/lib1funcs.asm')
| -rw-r--r-- | gcc/config/xtensa/lib1funcs.asm | 57 |
1 files changed, 29 insertions, 28 deletions
diff --git a/gcc/config/xtensa/lib1funcs.asm b/gcc/config/xtensa/lib1funcs.asm index ebfd54ddfcd..7d316ede805 100644 --- a/gcc/config/xtensa/lib1funcs.asm +++ b/gcc/config/xtensa/lib1funcs.asm @@ -30,10 +30,11 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA #include "xtensa-config.h" -# Note: These functions use a minimum stack frame size of 32. This is -# necessary for Xtensa configurations that only support a fixed register -# window size of 8, where even leaf functions (such as these) need to -# allocate space for a 4-word "extra save area". +# Force each stack frame to contain an "Extra Save Area" (ESA) of at least +# 16 bytes. This is necessary for non-standard Xtensa configurations that +# only support a fixed register window size of 8, where even leaf functions +# (such as these) need the ESA for interrupt handlers. +#define MIN_ESA 16 # Define macros for the ABS and ADDX* instructions to handle cases # where they are not included in the Xtensa processor configuration. @@ -75,20 +76,20 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA #endif .endm -# Define macros for function entry and return, supporting either the +# Define macros for leaf function entry and return, supporting either the # standard register windowed ABI or the non-windowed call0 ABI. These # macros do not allocate any extra stack space, so they only work for # leaf functions that do not need to spill anything to the stack. - .macro abi_entry reg, size + .macro leaf_entry reg, size #if XCHAL_HAVE_WINDOWED && !__XTENSA_CALL0_ABI__ - entry \reg, \size + entry \reg, \size + MIN_ESA #else /* do nothing */ #endif .endm - .macro abi_return + .macro leaf_return #if XCHAL_HAVE_WINDOWED && !__XTENSA_CALL0_ABI__ retw #else @@ -102,14 +103,14 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA .global __mulsi3 .type __mulsi3,@function __mulsi3: - abi_entry sp, 32 + leaf_entry sp, 16 #if XCHAL_HAVE_MUL16 or a4, a2, a3 srai a4, a4, 16 bnez a4, .LMUL16 mul16u a2, a2, a3 - abi_return + leaf_return .LMUL16: srai a4, a2, 16 srai a5, a3, 16 @@ -165,7 +166,7 @@ __mulsi3: bgeui a3, 16, .Lmult_main_loop neg a3, a2 movltz a2, a3, a5 - abi_return + leaf_return .align 4 .Lmult_main_loop: @@ -195,7 +196,7 @@ __mulsi3: #endif /* !XCHAL_HAVE_MUL16 && !XCHAL_HAVE_MAC16 */ - abi_return + leaf_return .size __mulsi3,.-__mulsi3 #endif /* L_mulsi3 */ @@ -264,7 +265,7 @@ __nsau_data: .global __udivsi3 .type __udivsi3,@function __udivsi3: - abi_entry sp, 32 + leaf_entry sp, 16 bltui a3, 2, .Lle_one # check if the divisor <= 1 mov a6, a2 # keep dividend in a6 @@ -297,24 +298,24 @@ __udivsi3: bltu a6, a3, .Lreturn addi a2, a2, 1 # increment quotient if dividend >= divisor .Lreturn: - abi_return + leaf_return .Lle_one: beqz a3, .Lerror # if divisor == 1, return the dividend - abi_return + leaf_return .Lspecial: # return dividend >= divisor bltu a6, a3, .Lreturn0 movi a2, 1 - abi_return + leaf_return .Lerror: # just return 0; could throw an exception .Lreturn0: movi a2, 0 - abi_return + leaf_return .size __udivsi3,.-__udivsi3 #endif /* L_udivsi3 */ @@ -325,7 +326,7 @@ __udivsi3: .global __divsi3 .type __divsi3,@function __divsi3: - abi_entry sp, 32 + leaf_entry sp, 16 xor a7, a2, a3 # sign = dividend ^ divisor do_abs a6, a2, a4 # udividend = abs(dividend) do_abs a3, a3, a4 # udivisor = abs(divisor) @@ -361,27 +362,27 @@ __divsi3: .Lreturn: neg a5, a2 movltz a2, a5, a7 # return (sign < 0) ? -quotient : quotient - abi_return + leaf_return .Lle_one: beqz a3, .Lerror neg a2, a6 # if udivisor == 1, then return... movgez a2, a6, a7 # (sign < 0) ? -udividend : udividend - abi_return + leaf_return .Lspecial: bltu a6, a3, .Lreturn0 # if dividend < divisor, return 0 movi a2, 1 movi a4, -1 movltz a2, a4, a7 # else return (sign < 0) ? -1 : 1 - abi_return + leaf_return .Lerror: # just return 0; could throw an exception .Lreturn0: movi a2, 0 - abi_return + leaf_return .size __divsi3,.-__divsi3 #endif /* L_divsi3 */ @@ -392,7 +393,7 @@ __divsi3: .global __umodsi3 .type __umodsi3,@function __umodsi3: - abi_entry sp, 32 + leaf_entry sp, 16 bltui a3, 2, .Lle_one # check if the divisor is <= 1 do_nsau a5, a2, a6, a7 # dividend_shift = nsau(dividend) @@ -422,13 +423,13 @@ __umodsi3: bltu a2, a3, .Lreturn sub a2, a2, a3 # subtract once more if dividend >= divisor .Lreturn: - abi_return + leaf_return .Lle_one: # the divisor is either 0 or 1, so just return 0. # someday we may want to throw an exception if the divisor is 0. movi a2, 0 - abi_return + leaf_return .size __umodsi3,.-__umodsi3 #endif /* L_umodsi3 */ @@ -439,7 +440,7 @@ __umodsi3: .global __modsi3 .type __modsi3,@function __modsi3: - abi_entry sp, 32 + leaf_entry sp, 16 mov a7, a2 # save original (signed) dividend do_abs a2, a2, a4 # udividend = abs(dividend) do_abs a3, a3, a4 # udivisor = abs(divisor) @@ -474,13 +475,13 @@ __modsi3: bgez a7, .Lpositive neg a2, a2 # if (dividend < 0), return -udividend .Lpositive: - abi_return + leaf_return .Lle_one: # udivisor is either 0 or 1, so just return 0. # someday we may want to throw an exception if udivisor is 0. movi a2, 0 - abi_return + leaf_return .size __modsi3,.-__modsi3 #endif /* L_modsi3 */ |